How to use assertDecreases method in chai

Best JavaScript code snippet using chai

assertions.js

Source:assertions.js

1/*!2 * chai3 * http://chaijs.com4 * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>5 * MIT Licensed6 */7module.exports = function (chai, _) {8  var Assertion = chai.Assertion9    , toString = Object.prototype.toString10    , flag = _.flag;11  /**12   * ### Language Chains13   *14   * The following are provided as chainable getters to15   * improve the readability of your assertions. They16   * do not provide testing capabilities unless they17   * have been overwritten by a plugin.18   *19   * **Chains**20   *21   * - to22   * - be23   * - been24   * - is25   * - that26   * - which27   * - and28   * - has29   * - have30   * - with31   * - at32   * - of33   * - same34   *35   * @name language chains36   * @api public37   */38  [ 'to', 'be', 'been'39  , 'is', 'and', 'has', 'have'40  , 'with', 'that', 'which', 'at'41  , 'of', 'same' ].forEach(function (chain) {42    Assertion.addProperty(chain, function () {43      return this;44    });45  });46  /**47   * ### .not48   *49   * Negates any of assertions following in the chain.50   *51   *     expect(foo).to.not.equal('bar');52   *     expect(goodFn).to.not.throw(Error);53   *     expect({ foo: 'baz' }).to.have.property('foo')54   *       .and.not.equal('bar');55   *56   * @name not57   * @api public58   */59  Assertion.addProperty('not', function () {60    flag(this, 'negate', true);61  });62  /**63   * ### .deep64   *65   * Sets the `deep` flag, later used by the `equal` and66   * `property` assertions.67   *68   *     expect(foo).to.deep.equal({ bar: 'baz' });69   *     expect({ foo: { bar: { baz: 'quux' } } })70   *       .to.have.deep.property('foo.bar.baz', 'quux');71   *72   * @name deep73   * @api public74   */75  Assertion.addProperty('deep', function () {76    flag(this, 'deep', true);77  });78  /**79   * ### .any80   *81   * Sets the `any` flag, (opposite of the `all` flag)82   * later used in the `keys` assertion. 83   *84   *     expect(foo).to.have.any.keys('bar', 'baz');85   *86   * @name any87   * @api public88   */89  Assertion.addProperty('any', function () {90    flag(this, 'any', true);91    flag(this, 'all', false)92  });93  /**94   * ### .all95   *96   * Sets the `all` flag (opposite of the `any` flag) 97   * later used by the `keys` assertion.98   *99   *     expect(foo).to.have.all.keys('bar', 'baz');100   *101   * @name all102   * @api public103   */104  Assertion.addProperty('all', function () {105    flag(this, 'all', true);106    flag(this, 'any', false);107  });108  /**109   * ### .a(type)110   *111   * The `a` and `an` assertions are aliases that can be112   * used either as language chains or to assert a value's113   * type.114   *115   *     // typeof116   *     expect('test').to.be.a('string');117   *     expect({ foo: 'bar' }).to.be.an('object');118   *     expect(null).to.be.a('null');119   *     expect(undefined).to.be.an('undefined');120   *121   *     // language chain122   *     expect(foo).to.be.an.instanceof(Foo);123   *124   * @name a125   * @alias an126   * @param {String} type127   * @param {String} message _optional_128   * @api public129   */130  function an (type, msg) {131    if (msg) flag(this, 'message', msg);132    type = type.toLowerCase();133    var obj = flag(this, 'object')134      , article = ~[ 'a', 'e', 'i', 'o', 'u' ].indexOf(type.charAt(0)) ? 'an ' : 'a ';135    this.assert(136        type === _.type(obj)137      , 'expected #{this} to be ' + article + type138      , 'expected #{this} not to be ' + article + type139    );140  }141  Assertion.addChainableMethod('an', an);142  Assertion.addChainableMethod('a', an);143  /**144   * ### .include(value)145   *146   * The `include` and `contain` assertions can be used as either property147   * based language chains or as methods to assert the inclusion of an object148   * in an array or a substring in a string. When used as language chains,149   * they toggle the `contains` flag for the `keys` assertion.150   *151   *     expect([1,2,3]).to.include(2);152   *     expect('foobar').to.contain('foo');153   *     expect({ foo: 'bar', hello: 'universe' }).to.include.keys('foo');154   *155   * @name include156   * @alias contain157   * @alias includes158   * @alias contains159   * @param {Object|String|Number} obj160   * @param {String} message _optional_161   * @api public162   */163  function includeChainingBehavior () {164    flag(this, 'contains', true);165  }166  function include (val, msg) {167    if (msg) flag(this, 'message', msg);168    var obj = flag(this, 'object');169    var expected = false;170    if (_.type(obj) === 'array' && _.type(val) === 'object') {171      for (var i in obj) {172        if (_.eql(obj[i], val)) {173          expected = true;174          break;175        }176      }177    } else if (_.type(val) === 'object') {178      if (!flag(this, 'negate')) {179        for (var k in val) new Assertion(obj).property(k, val[k]);180        return;181      }182      var subset = {};183      for (var k in val) subset[k] = obj[k];184      expected = _.eql(subset, val);185    } else {186      expected = obj && ~obj.indexOf(val);187    }188    this.assert(189        expected190      , 'expected #{this} to include ' + _.inspect(val)191      , 'expected #{this} to not include ' + _.inspect(val));192  }193  Assertion.addChainableMethod('include', include, includeChainingBehavior);194  Assertion.addChainableMethod('contain', include, includeChainingBehavior);195  Assertion.addChainableMethod('contains', include, includeChainingBehavior);196  Assertion.addChainableMethod('includes', include, includeChainingBehavior);197  /**198   * ### .ok199   *200   * Asserts that the target is truthy.201   *202   *     expect('everthing').to.be.ok;203   *     expect(1).to.be.ok;204   *     expect(false).to.not.be.ok;205   *     expect(undefined).to.not.be.ok;206   *     expect(null).to.not.be.ok;207   *208   * @name ok209   * @api public210   */211  Assertion.addProperty('ok', function () {212    this.assert(213        flag(this, 'object')214      , 'expected #{this} to be truthy'215      , 'expected #{this} to be falsy');216  });217  /**218   * ### .true219   *220   * Asserts that the target is `true`.221   *222   *     expect(true).to.be.true;223   *     expect(1).to.not.be.true;224   *225   * @name true226   * @api public227   */228  Assertion.addProperty('true', function () {229    this.assert(230        true === flag(this, 'object')231      , 'expected #{this} to be true'232      , 'expected #{this} to be false'233      , this.negate ? false : true234    );235  });236  /**237   * ### .false238   *239   * Asserts that the target is `false`.240   *241   *     expect(false).to.be.false;242   *     expect(0).to.not.be.false;243   *244   * @name false245   * @api public246   */247  Assertion.addProperty('false', function () {248    this.assert(249        false === flag(this, 'object')250      , 'expected #{this} to be false'251      , 'expected #{this} to be true'252      , this.negate ? true : false253    );254  });255  /**256   * ### .null257   *258   * Asserts that the target is `null`.259   *260   *     expect(null).to.be.null;261   *     expect(undefined).not.to.be.null;262   *263   * @name null264   * @api public265   */266  Assertion.addProperty('null', function () {267    this.assert(268        null === flag(this, 'object')269      , 'expected #{this} to be null'270      , 'expected #{this} not to be null'271    );272  });273  /**274   * ### .undefined275   *276   * Asserts that the target is `undefined`.277   *278   *     expect(undefined).to.be.undefined;279   *     expect(null).to.not.be.undefined;280   *281   * @name undefined282   * @api public283   */284  Assertion.addProperty('undefined', function () {285    this.assert(286        undefined === flag(this, 'object')287      , 'expected #{this} to be undefined'288      , 'expected #{this} not to be undefined'289    );290  });291  /**292   * ### .exist293   *294   * Asserts that the target is neither `null` nor `undefined`.295   *296   *     var foo = 'hi'297   *       , bar = null298   *       , baz;299   *300   *     expect(foo).to.exist;301   *     expect(bar).to.not.exist;302   *     expect(baz).to.not.exist;303   *304   * @name exist305   * @api public306   */307  Assertion.addProperty('exist', function () {308    this.assert(309        null != flag(this, 'object')310      , 'expected #{this} to exist'311      , 'expected #{this} to not exist'312    );313  });314  /**315   * ### .empty316   *317   * Asserts that the target's length is `0`. For arrays and strings, it checks318   * the `length` property. For objects, it gets the count of319   * enumerable keys.320   *321   *     expect([]).to.be.empty;322   *     expect('').to.be.empty;323   *     expect({}).to.be.empty;324   *325   * @name empty326   * @api public327   */328  Assertion.addProperty('empty', function () {329    var obj = flag(this, 'object')330      , expected = obj;331    if (Array.isArray(obj) || 'string' === typeof object) {332      expected = obj.length;333    } else if (typeof obj === 'object') {334      expected = Object.keys(obj).length;335    }336    this.assert(337        !expected338      , 'expected #{this} to be empty'339      , 'expected #{this} not to be empty'340    );341  });342  /**343   * ### .arguments344   *345   * Asserts that the target is an arguments object.346   *347   *     function test () {348   *       expect(arguments).to.be.arguments;349   *     }350   *351   * @name arguments352   * @alias Arguments353   * @api public354   */355  function checkArguments () {356    var obj = flag(this, 'object')357      , type = Object.prototype.toString.call(obj);358    this.assert(359        '[object Arguments]' === type360      , 'expected #{this} to be arguments but got ' + type361      , 'expected #{this} to not be arguments'362    );363  }364  Assertion.addProperty('arguments', checkArguments);365  Assertion.addProperty('Arguments', checkArguments);366  /**367   * ### .equal(value)368   *369   * Asserts that the target is strictly equal (`===`) to `value`.370   * Alternately, if the `deep` flag is set, asserts that371   * the target is deeply equal to `value`.372   *373   *     expect('hello').to.equal('hello');374   *     expect(42).to.equal(42);375   *     expect(1).to.not.equal(true);376   *     expect({ foo: 'bar' }).to.not.equal({ foo: 'bar' });377   *     expect({ foo: 'bar' }).to.deep.equal({ foo: 'bar' });378   *379   * @name equal380   * @alias equals381   * @alias eq382   * @alias deep.equal383   * @param {Mixed} value384   * @param {String} message _optional_385   * @api public386   */387  function assertEqual (val, msg) {388    if (msg) flag(this, 'message', msg);389    var obj = flag(this, 'object');390    if (flag(this, 'deep')) {391      return this.eql(val);392    } else {393      this.assert(394          val === obj395        , 'expected #{this} to equal #{exp}'396        , 'expected #{this} to not equal #{exp}'397        , val398        , this._obj399        , true400      );401    }402  }403  Assertion.addMethod('equal', assertEqual);404  Assertion.addMethod('equals', assertEqual);405  Assertion.addMethod('eq', assertEqual);406  /**407   * ### .eql(value)408   *409   * Asserts that the target is deeply equal to `value`.410   *411   *     expect({ foo: 'bar' }).to.eql({ foo: 'bar' });412   *     expect([ 1, 2, 3 ]).to.eql([ 1, 2, 3 ]);413   *414   * @name eql415   * @alias eqls416   * @param {Mixed} value417   * @param {String} message _optional_418   * @api public419   */420  function assertEql(obj, msg) {421    if (msg) flag(this, 'message', msg);422    this.assert(423        _.eql(obj, flag(this, 'object'))424      , 'expected #{this} to deeply equal #{exp}'425      , 'expected #{this} to not deeply equal #{exp}'426      , obj427      , this._obj428      , true429    );430  }431  Assertion.addMethod('eql', assertEql);432  Assertion.addMethod('eqls', assertEql);433  /**434   * ### .above(value)435   *436   * Asserts that the target is greater than `value`.437   *438   *     expect(10).to.be.above(5);439   *440   * Can also be used in conjunction with `length` to441   * assert a minimum length. The benefit being a442   * more informative error message than if the length443   * was supplied directly.444   *445   *     expect('foo').to.have.length.above(2);446   *     expect([ 1, 2, 3 ]).to.have.length.above(2);447   *448   * @name above449   * @alias gt450   * @alias greaterThan451   * @param {Number} value452   * @param {String} message _optional_453   * @api public454   */455  function assertAbove (n, msg) {456    if (msg) flag(this, 'message', msg);457    var obj = flag(this, 'object');458    if (flag(this, 'doLength')) {459      new Assertion(obj, msg).to.have.property('length');460      var len = obj.length;461      this.assert(462          len > n463        , 'expected #{this} to have a length above #{exp} but got #{act}'464        , 'expected #{this} to not have a length above #{exp}'465        , n466        , len467      );468    } else {469      this.assert(470          obj > n471        , 'expected #{this} to be above ' + n472        , 'expected #{this} to be at most ' + n473      );474    }475  }476  Assertion.addMethod('above', assertAbove);477  Assertion.addMethod('gt', assertAbove);478  Assertion.addMethod('greaterThan', assertAbove);479  /**480   * ### .least(value)481   *482   * Asserts that the target is greater than or equal to `value`.483   *484   *     expect(10).to.be.at.least(10);485   *486   * Can also be used in conjunction with `length` to487   * assert a minimum length. The benefit being a488   * more informative error message than if the length489   * was supplied directly.490   *491   *     expect('foo').to.have.length.of.at.least(2);492   *     expect([ 1, 2, 3 ]).to.have.length.of.at.least(3);493   *494   * @name least495   * @alias gte496   * @param {Number} value497   * @param {String} message _optional_498   * @api public499   */500  function assertLeast (n, msg) {501    if (msg) flag(this, 'message', msg);502    var obj = flag(this, 'object');503    if (flag(this, 'doLength')) {504      new Assertion(obj, msg).to.have.property('length');505      var len = obj.length;506      this.assert(507          len >= n508        , 'expected #{this} to have a length at least #{exp} but got #{act}'509        , 'expected #{this} to have a length below #{exp}'510        , n511        , len512      );513    } else {514      this.assert(515          obj >= n516        , 'expected #{this} to be at least ' + n517        , 'expected #{this} to be below ' + n518      );519    }520  }521  Assertion.addMethod('least', assertLeast);522  Assertion.addMethod('gte', assertLeast);523  /**524   * ### .below(value)525   *526   * Asserts that the target is less than `value`.527   *528   *     expect(5).to.be.below(10);529   *530   * Can also be used in conjunction with `length` to531   * assert a maximum length. The benefit being a532   * more informative error message than if the length533   * was supplied directly.534   *535   *     expect('foo').to.have.length.below(4);536   *     expect([ 1, 2, 3 ]).to.have.length.below(4);537   *538   * @name below539   * @alias lt540   * @alias lessThan541   * @param {Number} value542   * @param {String} message _optional_543   * @api public544   */545  function assertBelow (n, msg) {546    if (msg) flag(this, 'message', msg);547    var obj = flag(this, 'object');548    if (flag(this, 'doLength')) {549      new Assertion(obj, msg).to.have.property('length');550      var len = obj.length;551      this.assert(552          len < n553        , 'expected #{this} to have a length below #{exp} but got #{act}'554        , 'expected #{this} to not have a length below #{exp}'555        , n556        , len557      );558    } else {559      this.assert(560          obj < n561        , 'expected #{this} to be below ' + n562        , 'expected #{this} to be at least ' + n563      );564    }565  }566  Assertion.addMethod('below', assertBelow);567  Assertion.addMethod('lt', assertBelow);568  Assertion.addMethod('lessThan', assertBelow);569  /**570   * ### .most(value)571   *572   * Asserts that the target is less than or equal to `value`.573   *574   *     expect(5).to.be.at.most(5);575   *576   * Can also be used in conjunction with `length` to577   * assert a maximum length. The benefit being a578   * more informative error message than if the length579   * was supplied directly.580   *581   *     expect('foo').to.have.length.of.at.most(4);582   *     expect([ 1, 2, 3 ]).to.have.length.of.at.most(3);583   *584   * @name most585   * @alias lte586   * @param {Number} value587   * @param {String} message _optional_588   * @api public589   */590  function assertMost (n, msg) {591    if (msg) flag(this, 'message', msg);592    var obj = flag(this, 'object');593    if (flag(this, 'doLength')) {594      new Assertion(obj, msg).to.have.property('length');595      var len = obj.length;596      this.assert(597          len <= n598        , 'expected #{this} to have a length at most #{exp} but got #{act}'599        , 'expected #{this} to have a length above #{exp}'600        , n601        , len602      );603    } else {604      this.assert(605          obj <= n606        , 'expected #{this} to be at most ' + n607        , 'expected #{this} to be above ' + n608      );609    }610  }611  Assertion.addMethod('most', assertMost);612  Assertion.addMethod('lte', assertMost);613  /**614   * ### .within(start, finish)615   *616   * Asserts that the target is within a range.617   *618   *     expect(7).to.be.within(5,10);619   *620   * Can also be used in conjunction with `length` to621   * assert a length range. The benefit being a622   * more informative error message than if the length623   * was supplied directly.624   *625   *     expect('foo').to.have.length.within(2,4);626   *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);627   *628   * @name within629   * @param {Number} start lowerbound inclusive630   * @param {Number} finish upperbound inclusive631   * @param {String} message _optional_632   * @api public633   */634  Assertion.addMethod('within', function (start, finish, msg) {635    if (msg) flag(this, 'message', msg);636    var obj = flag(this, 'object')637      , range = start + '..' + finish;638    if (flag(this, 'doLength')) {639      new Assertion(obj, msg).to.have.property('length');640      var len = obj.length;641      this.assert(642          len >= start && len <= finish643        , 'expected #{this} to have a length within ' + range644        , 'expected #{this} to not have a length within ' + range645      );646    } else {647      this.assert(648          obj >= start && obj <= finish649        , 'expected #{this} to be within ' + range650        , 'expected #{this} to not be within ' + range651      );652    }653  });654  /**655   * ### .instanceof(constructor)656   *657   * Asserts that the target is an instance of `constructor`.658   *659   *     var Tea = function (name) { this.name = name; }660   *       , Chai = new Tea('chai');661   *662   *     expect(Chai).to.be.an.instanceof(Tea);663   *     expect([ 1, 2, 3 ]).to.be.instanceof(Array);664   *665   * @name instanceof666   * @param {Constructor} constructor667   * @param {String} message _optional_668   * @alias instanceOf669   * @api public670   */671  function assertInstanceOf (constructor, msg) {672    if (msg) flag(this, 'message', msg);673    var name = _.getName(constructor);674    this.assert(675        flag(this, 'object') instanceof constructor676      , 'expected #{this} to be an instance of ' + name677      , 'expected #{this} to not be an instance of ' + name678    );679  };680  Assertion.addMethod('instanceof', assertInstanceOf);681  Assertion.addMethod('instanceOf', assertInstanceOf);682  /**683   * ### .property(name, [value])684   *685   * Asserts that the target has a property `name`, optionally asserting that686   * the value of that property is strictly equal to  `value`.687   * If the `deep` flag is set, you can use dot- and bracket-notation for deep688   * references into objects and arrays.689   *690   *     // simple referencing691   *     var obj = { foo: 'bar' };692   *     expect(obj).to.have.property('foo');693   *     expect(obj).to.have.property('foo', 'bar');694   *695   *     // deep referencing696   *     var deepObj = {697   *         green: { tea: 'matcha' }698   *       , teas: [ 'chai', 'matcha', { tea: 'konacha' } ]699   *     };700   *     expect(deepObj).to.have.deep.property('green.tea', 'matcha');701   *     expect(deepObj).to.have.deep.property('teas[1]', 'matcha');702   *     expect(deepObj).to.have.deep.property('teas[2].tea', 'konacha');703   *704   * You can also use an array as the starting point of a `deep.property`705   * assertion, or traverse nested arrays.706   *707   *     var arr = [708   *         [ 'chai', 'matcha', 'konacha' ]709   *       , [ { tea: 'chai' }710   *         , { tea: 'matcha' }711   *         , { tea: 'konacha' } ]712   *     ];713   *714   *     expect(arr).to.have.deep.property('[0][1]', 'matcha');715   *     expect(arr).to.have.deep.property('[1][2].tea', 'konacha');716   *717   * Furthermore, `property` changes the subject of the assertion718   * to be the value of that property from the original object. This719   * permits for further chainable assertions on that property.720   *721   *     expect(obj).to.have.property('foo')722   *       .that.is.a('string');723   *     expect(deepObj).to.have.property('green')724   *       .that.is.an('object')725   *       .that.deep.equals({ tea: 'matcha' });726   *     expect(deepObj).to.have.property('teas')727   *       .that.is.an('array')728   *       .with.deep.property('[2]')729   *         .that.deep.equals({ tea: 'konacha' });730   *731   * @name property732   * @alias deep.property733   * @param {String} name734   * @param {Mixed} value (optional)735   * @param {String} message _optional_736   * @returns value of property for chaining737   * @api public738   */739  Assertion.addMethod('property', function (name, val, msg) {740    if (msg) flag(this, 'message', msg);741    var isDeep = !!flag(this, 'deep')742      , descriptor = isDeep ? 'deep property ' : 'property '743      , negate = flag(this, 'negate')744      , obj = flag(this, 'object')745      , pathInfo = isDeep ? _.getPathInfo(name, obj) : null746      , hasProperty = isDeep747        ? pathInfo.exists748        : _.hasProperty(name, obj)749      , value = isDeep750        ? pathInfo.value751        : obj[name];752    if (negate && undefined !== val) {753      if (undefined === value) {754        msg = (msg != null) ? msg + ': ' : '';755        throw new Error(msg + _.inspect(obj) + ' has no ' + descriptor + _.inspect(name));756      }757    } else {758      this.assert(759          hasProperty760        , 'expected #{this} to have a ' + descriptor + _.inspect(name)761        , 'expected #{this} to not have ' + descriptor + _.inspect(name));762    }763    if (undefined !== val) {764      this.assert(765          val === value766        , 'expected #{this} to have a ' + descriptor + _.inspect(name) + ' of #{exp}, but got #{act}'767        , 'expected #{this} to not have a ' + descriptor + _.inspect(name) + ' of #{act}'768        , val769        , value770      );771    }772    flag(this, 'object', value);773  });774  /**775   * ### .ownProperty(name)776   *777   * Asserts that the target has an own property `name`.778   *779   *     expect('test').to.have.ownProperty('length');780   *781   * @name ownProperty782   * @alias haveOwnProperty783   * @param {String} name784   * @param {String} message _optional_785   * @api public786   */787  function assertOwnProperty (name, msg) {788    if (msg) flag(this, 'message', msg);789    var obj = flag(this, 'object');790    this.assert(791        obj.hasOwnProperty(name)792      , 'expected #{this} to have own property ' + _.inspect(name)793      , 'expected #{this} to not have own property ' + _.inspect(name)794    );795  }796  Assertion.addMethod('ownProperty', assertOwnProperty);797  Assertion.addMethod('haveOwnProperty', assertOwnProperty);798  /**799   * ### .length(value)800   *801   * Asserts that the target's `length` property has802   * the expected value.803   *804   *     expect([ 1, 2, 3]).to.have.length(3);805   *     expect('foobar').to.have.length(6);806   *807   * Can also be used as a chain precursor to a value808   * comparison for the length property.809   *810   *     expect('foo').to.have.length.above(2);811   *     expect([ 1, 2, 3 ]).to.have.length.above(2);812   *     expect('foo').to.have.length.below(4);813   *     expect([ 1, 2, 3 ]).to.have.length.below(4);814   *     expect('foo').to.have.length.within(2,4);815   *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);816   *817   * @name length818   * @alias lengthOf819   * @param {Number} length820   * @param {String} message _optional_821   * @api public822   */823  function assertLengthChain () {824    flag(this, 'doLength', true);825  }826  function assertLength (n, msg) {827    if (msg) flag(this, 'message', msg);828    var obj = flag(this, 'object');829    new Assertion(obj, msg).to.have.property('length');830    var len = obj.length;831    this.assert(832        len == n833      , 'expected #{this} to have a length of #{exp} but got #{act}'834      , 'expected #{this} to not have a length of #{act}'835      , n836      , len837    );838  }839  Assertion.addChainableMethod('length', assertLength, assertLengthChain);840  Assertion.addMethod('lengthOf', assertLength);841  /**842   * ### .match(regexp)843   *844   * Asserts that the target matches a regular expression.845   *846   *     expect('foobar').to.match(/^foo/);847   *848   * @name match849   * @param {RegExp} RegularExpression850   * @param {String} message _optional_851   * @api public852   */853  Assertion.addMethod('match', function (re, msg) {854    if (msg) flag(this, 'message', msg);855    var obj = flag(this, 'object');856    this.assert(857        re.exec(obj)858      , 'expected #{this} to match ' + re859      , 'expected #{this} not to match ' + re860    );861  });862  /**863   * ### .string(string)864   *865   * Asserts that the string target contains another string.866   *867   *     expect('foobar').to.have.string('bar');868   *869   * @name string870   * @param {String} string871   * @param {String} message _optional_872   * @api public873   */874  Assertion.addMethod('string', function (str, msg) {875    if (msg) flag(this, 'message', msg);876    var obj = flag(this, 'object');877    new Assertion(obj, msg).is.a('string');878    this.assert(879        ~obj.indexOf(str)880      , 'expected #{this} to contain ' + _.inspect(str)881      , 'expected #{this} to not contain ' + _.inspect(str)882    );883  });884  /**885   * ### .keys(key1, [key2], [...])886   *887   * Asserts that the target contains any or all of the passed-in keys.888   * Use in combination with `any`, `all`, `contains`, or `have` will affect 889   * what will pass.890   * 891   * When used in conjunction with `any`, at least one key that is passed 892   * in must exist in the target object. This is regardless whether or not 893   * the `have` or `contain` qualifiers are used. Note, either `any` or `all`894   * should be used in the assertion. If neither are used, the assertion is895   * defaulted to `all`.896   * 897   * When both `all` and `contain` are used, the target object must have at 898   * least all of the passed-in keys but may have more keys not listed.899   * 900   * When both `all` and `have` are used, the target object must both contain901   * all of the passed-in keys AND the number of keys in the target object must902   * match the number of keys passed in (in other words, a target object must 903   * have all and only all of the passed-in keys).904   * 905   *     expect({ foo: 1, bar: 2 }).to.have.any.keys('foo', 'baz');906   *     expect({ foo: 1, bar: 2 }).to.have.any.keys('foo');907   *     expect({ foo: 1, bar: 2 }).to.contain.any.keys('bar', 'baz');908   *     expect({ foo: 1, bar: 2 }).to.contain.any.keys(['foo']);909   *     expect({ foo: 1, bar: 2 }).to.contain.any.keys({'foo': 6});910   *     expect({ foo: 1, bar: 2 }).to.have.all.keys(['bar', 'foo']);911   *     expect({ foo: 1, bar: 2 }).to.have.all.keys({'bar': 6, 'foo', 7});912   *     expect({ foo: 1, bar: 2, baz: 3 }).to.contain.all.keys(['bar', 'foo']);913   *     expect({ foo: 1, bar: 2, baz: 3 }).to.contain.all.keys([{'bar': 6}}]);914   *915   *916   * @name keys917   * @alias key918   * @param {String...|Array|Object} keys919   * @api public920   */921  function assertKeys (keys) {922    var obj = flag(this, 'object')923      , str924      , ok = true925      , mixedArgsMsg = 'keys must be given single argument of Array|Object|String, or multiple String arguments';926    switch (_.type(keys)) {927      case "array":928        if (arguments.length > 1) throw (new Error(mixedArgsMsg));929        break;930      case "object":931        if (arguments.length > 1) throw (new Error(mixedArgsMsg));932        keys = Object.keys(keys);933        break;934      default:935        keys = Array.prototype.slice.call(arguments);936    }937    if (!keys.length) throw new Error('keys required');938    var actual = Object.keys(obj)939      , expected = keys940      , len = keys.length941      , any = flag(this, 'any')942      , all = flag(this, 'all');943    if (!any && !all) {944      all = true;945    }946    // Has any947    if (any) {948      var intersection = expected.filter(function(key) {949        return ~actual.indexOf(key);950      });951      ok = intersection.length > 0;952    }953    // Has all954    if (all) {955      ok = keys.every(function(key){956        return ~actual.indexOf(key);957      });958      if (!flag(this, 'negate') && !flag(this, 'contains')) {959        ok = ok && keys.length == actual.length;960      }961    }962    // Key string963    if (len > 1) {964      keys = keys.map(function(key){965        return _.inspect(key);966      });967      var last = keys.pop();968      if (all) {969        str = keys.join(', ') + ', and ' + last;970      }971      if (any) {972        str = keys.join(', ') + ', or ' + last;973      }974    } else {975      str = _.inspect(keys[0]);976    }977    // Form978    str = (len > 1 ? 'keys ' : 'key ') + str;979    // Have / include980    str = (flag(this, 'contains') ? 'contain ' : 'have ') + str;981    // Assertion982    this.assert(983        ok984      , 'expected #{this} to ' + str985      , 'expected #{this} to not ' + str986      , expected.slice(0).sort()987      , actual.sort()988      , true989    );990  }991  Assertion.addMethod('keys', assertKeys);992  Assertion.addMethod('key', assertKeys);993  /**994   * ### .throw(constructor)995   *996   * Asserts that the function target will throw a specific error, or specific type of error997   * (as determined using `instanceof`), optionally with a RegExp or string inclusion test998   * for the error's message.999   *1000   *     var err = new ReferenceError('This is a bad function.');1001   *     var fn = function () { throw err; }1002   *     expect(fn).to.throw(ReferenceError);1003   *     expect(fn).to.throw(Error);1004   *     expect(fn).to.throw(/bad function/);1005   *     expect(fn).to.not.throw('good function');1006   *     expect(fn).to.throw(ReferenceError, /bad function/);1007   *     expect(fn).to.throw(err);1008   *     expect(fn).to.not.throw(new RangeError('Out of range.'));1009   *1010   * Please note that when a throw expectation is negated, it will check each1011   * parameter independently, starting with error constructor type. The appropriate way1012   * to check for the existence of a type of error but for a message that does not match1013   * is to use `and`.1014   *1015   *     expect(fn).to.throw(ReferenceError)1016   *        .and.not.throw(/good function/);1017   *1018   * @name throw1019   * @alias throws1020   * @alias Throw1021   * @param {ErrorConstructor} constructor1022   * @param {String|RegExp} expected error message1023   * @param {String} message _optional_1024   * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types1025   * @returns error for chaining (null if no error)1026   * @api public1027   */1028  function assertThrows (constructor, errMsg, msg) {1029    if (msg) flag(this, 'message', msg);1030    var obj = flag(this, 'object');1031    new Assertion(obj, msg).is.a('function');1032    var thrown = false1033      , desiredError = null1034      , name = null1035      , thrownError = null;1036    if (arguments.length === 0) {1037      errMsg = null;1038      constructor = null;1039    } else if (constructor && (constructor instanceof RegExp || 'string' === typeof constructor)) {1040      errMsg = constructor;1041      constructor = null;1042    } else if (constructor && constructor instanceof Error) {1043      desiredError = constructor;1044      constructor = null;1045      errMsg = null;1046    } else if (typeof constructor === 'function') {1047      name = constructor.prototype.name || constructor.name;1048      if (name === 'Error' && constructor !== Error) {1049        name = (new constructor()).name;1050      }1051    } else {1052      constructor = null;1053    }1054    try {1055      obj();1056    } catch (err) {1057      // first, check desired error1058      if (desiredError) {1059        this.assert(1060            err === desiredError1061          , 'expected #{this} to throw #{exp} but #{act} was thrown'1062          , 'expected #{this} to not throw #{exp}'1063          , (desiredError instanceof Error ? desiredError.toString() : desiredError)1064          , (err instanceof Error ? err.toString() : err)1065        );1066        flag(this, 'object', err);1067        return this;1068      }1069      // next, check constructor1070      if (constructor) {1071        this.assert(1072            err instanceof constructor1073          , 'expected #{this} to throw #{exp} but #{act} was thrown'1074          , 'expected #{this} to not throw #{exp} but #{act} was thrown'1075          , name1076          , (err instanceof Error ? err.toString() : err)1077        );1078        if (!errMsg) {1079          flag(this, 'object', err);1080          return this;1081        }1082      }1083      // next, check message1084      var message = 'object' === _.type(err) && "message" in err1085        ? err.message1086        : '' + err;1087      if ((message != null) && errMsg && errMsg instanceof RegExp) {1088        this.assert(1089            errMsg.exec(message)1090          , 'expected #{this} to throw error matching #{exp} but got #{act}'1091          , 'expected #{this} to throw error not matching #{exp}'1092          , errMsg1093          , message1094        );1095        flag(this, 'object', err);1096        return this;1097      } else if ((message != null) && errMsg && 'string' === typeof errMsg) {1098        this.assert(1099            ~message.indexOf(errMsg)1100          , 'expected #{this} to throw error including #{exp} but got #{act}'1101          , 'expected #{this} to throw error not including #{act}'1102          , errMsg1103          , message1104        );1105        flag(this, 'object', err);1106        return this;1107      } else {1108        thrown = true;1109        thrownError = err;1110      }1111    }1112    var actuallyGot = ''1113      , expectedThrown = name !== null1114        ? name1115        : desiredError1116          ? '#{exp}' //_.inspect(desiredError)1117          : 'an error';1118    if (thrown) {1119      actuallyGot = ' but #{act} was thrown'1120    }1121    this.assert(1122        thrown === true1123      , 'expected #{this} to throw ' + expectedThrown + actuallyGot1124      , 'expected #{this} to not throw ' + expectedThrown + actuallyGot1125      , (desiredError instanceof Error ? desiredError.toString() : desiredError)1126      , (thrownError instanceof Error ? thrownError.toString() : thrownError)1127    );1128    flag(this, 'object', thrownError);1129  };1130  Assertion.addMethod('throw', assertThrows);1131  Assertion.addMethod('throws', assertThrows);1132  Assertion.addMethod('Throw', assertThrows);1133  /**1134   * ### .respondTo(method)1135   *1136   * Asserts that the object or class target will respond to a method.1137   *1138   *     Klass.prototype.bar = function(){};1139   *     expect(Klass).to.respondTo('bar');1140   *     expect(obj).to.respondTo('bar');1141   *1142   * To check if a constructor will respond to a static function,1143   * set the `itself` flag.1144   *1145   *     Klass.baz = function(){};1146   *     expect(Klass).itself.to.respondTo('baz');1147   *1148   * @name respondTo1149   * @param {String} method1150   * @param {String} message _optional_1151   * @api public1152   */1153  Assertion.addMethod('respondTo', function (method, msg) {1154    if (msg) flag(this, 'message', msg);1155    var obj = flag(this, 'object')1156      , itself = flag(this, 'itself')1157      , context = ('function' === _.type(obj) && !itself)1158        ? obj.prototype[method]1159        : obj[method];1160    this.assert(1161        'function' === typeof context1162      , 'expected #{this} to respond to ' + _.inspect(method)1163      , 'expected #{this} to not respond to ' + _.inspect(method)1164    );1165  });1166  /**1167   * ### .itself1168   *1169   * Sets the `itself` flag, later used by the `respondTo` assertion.1170   *1171   *     function Foo() {}1172   *     Foo.bar = function() {}1173   *     Foo.prototype.baz = function() {}1174   *1175   *     expect(Foo).itself.to.respondTo('bar');1176   *     expect(Foo).itself.not.to.respondTo('baz');1177   *1178   * @name itself1179   * @api public1180   */1181  Assertion.addProperty('itself', function () {1182    flag(this, 'itself', true);1183  });1184  /**1185   * ### .satisfy(method)1186   *1187   * Asserts that the target passes a given truth test.1188   *1189   *     expect(1).to.satisfy(function(num) { return num > 0; });1190   *1191   * @name satisfy1192   * @param {Function} matcher1193   * @param {String} message _optional_1194   * @api public1195   */1196  Assertion.addMethod('satisfy', function (matcher, msg) {1197    if (msg) flag(this, 'message', msg);1198    var obj = flag(this, 'object');1199    var result = matcher(obj);1200    this.assert(1201        result1202      , 'expected #{this} to satisfy ' + _.objDisplay(matcher)1203      , 'expected #{this} to not satisfy' + _.objDisplay(matcher)1204      , this.negate ? false : true1205      , result1206    );1207  });1208  /**1209   * ### .closeTo(expected, delta)1210   *1211   * Asserts that the target is equal `expected`, to within a +/- `delta` range.1212   *1213   *     expect(1.5).to.be.closeTo(1, 0.5);1214   *1215   * @name closeTo1216   * @param {Number} expected1217   * @param {Number} delta1218   * @param {String} message _optional_1219   * @api public1220   */1221  Assertion.addMethod('closeTo', function (expected, delta, msg) {1222    if (msg) flag(this, 'message', msg);1223    var obj = flag(this, 'object');1224    new Assertion(obj, msg).is.a('number');1225    if (_.type(expected) !== 'number' || _.type(delta) !== 'number') {1226      throw new Error('the arguments to closeTo must be numbers');1227    }1228    this.assert(1229        Math.abs(obj - expected) <= delta1230      , 'expected #{this} to be close to ' + expected + ' +/- ' + delta1231      , 'expected #{this} not to be close to ' + expected + ' +/- ' + delta1232    );1233  });1234  function isSubsetOf(subset, superset, cmp) {1235    return subset.every(function(elem) {1236      if (!cmp) return superset.indexOf(elem) !== -1;1237      return superset.some(function(elem2) {1238        return cmp(elem, elem2);1239      });1240    })1241  }1242  /**1243   * ### .members(set)1244   *1245   * Asserts that the target is a superset of `set`,1246   * or that the target and `set` have the same strictly-equal (===) members.1247   * Alternately, if the `deep` flag is set, set members are compared for deep1248   * equality.1249   *1250   *     expect([1, 2, 3]).to.include.members([3, 2]);1251   *     expect([1, 2, 3]).to.not.include.members([3, 2, 8]);1252   *1253   *     expect([4, 2]).to.have.members([2, 4]);1254   *     expect([5, 2]).to.not.have.members([5, 2, 1]);1255   *1256   *     expect([{ id: 1 }]).to.deep.include.members([{ id: 1 }]);1257   *1258   * @name members1259   * @param {Array} set1260   * @param {String} message _optional_1261   * @api public1262   */1263  Assertion.addMethod('members', function (subset, msg) {1264    if (msg) flag(this, 'message', msg);1265    var obj = flag(this, 'object');1266    new Assertion(obj).to.be.an('array');1267    new Assertion(subset).to.be.an('array');1268    var cmp = flag(this, 'deep') ? _.eql : undefined;1269    if (flag(this, 'contains')) {1270      return this.assert(1271          isSubsetOf(subset, obj, cmp)1272        , 'expected #{this} to be a superset of #{act}'1273        , 'expected #{this} to not be a superset of #{act}'1274        , obj1275        , subset1276      );1277    }1278    this.assert(1279        isSubsetOf(obj, subset, cmp) && isSubsetOf(subset, obj, cmp)1280        , 'expected #{this} to have the same members as #{act}'1281        , 'expected #{this} to not have the same members as #{act}'1282        , obj1283        , subset1284    );1285  });1286  /**1287   * ### .change(function)1288   *1289   * Asserts that a function changes an object property1290   *1291   *     var obj = { val: 10 };1292   *     var fn = function() { obj.val += 3 };1293   *     var noChangeFn = function() { return 'foo' + 'bar'; }1294   *     expect(fn).to.change(obj, 'val');1295   *     expect(noChangFn).to.not.change(obj, 'val')1296   *1297   * @name change1298   * @alias changes1299   * @alias Change1300   * @param {String} object1301   * @param {String} property name1302   * @param {String} message _optional_1303   * @api public1304   */1305  function assertChanges (object, prop, msg) {1306    if (msg) flag(this, 'message', msg);1307    var fn = flag(this, 'object');1308    new Assertion(object, msg).to.have.property(prop);1309    new Assertion(fn).is.a('function');1310    var initial = object[prop];1311    fn();1312    this.assert(1313      initial !== object[prop]1314      , 'expected .' + prop + ' to change'1315      , 'expected .' + prop + ' to not change'1316    );1317  }1318  Assertion.addChainableMethod('change', assertChanges);1319  Assertion.addChainableMethod('changes', assertChanges);1320  /**1321   * ### .increase(function)1322   *1323   * Asserts that a function increases an object property1324   *1325   *     var obj = { val: 10 };1326   *     var fn = function() { obj.val = 15 };1327   *     expect(fn).to.increase(obj, 'val');1328   *1329   * @name increase1330   * @alias increases1331   * @alias Increase1332   * @param {String} object1333   * @param {String} property name1334   * @param {String} message _optional_1335   * @api public1336   */1337  function assertIncreases (object, prop, msg) {1338    if (msg) flag(this, 'message', msg);1339    var fn = flag(this, 'object');1340    new Assertion(object, msg).to.have.property(prop);1341    new Assertion(fn).is.a('function');1342    var initial = object[prop];1343    fn();1344    this.assert(1345      object[prop] - initial > 01346      , 'expected .' + prop + ' to increase'1347      , 'expected .' + prop + ' to not increase'1348    );1349  }1350  Assertion.addChainableMethod('increase', assertIncreases);1351  Assertion.addChainableMethod('increases', assertIncreases);1352  /**1353   * ### .decrease(function)1354   *1355   * Asserts that a function decreases an object property1356   *1357   *     var obj = { val: 10 };1358   *     var fn = function() { obj.val = 5 };1359   *     expect(fn).to.decrease(obj, 'val');1360   *1361   * @name decrease1362   * @alias decreases1363   * @alias Decrease1364   * @param {String} object1365   * @param {String} property name1366   * @param {String} message _optional_1367   * @api public1368   */1369  function assertDecreases (object, prop, msg) {1370    if (msg) flag(this, 'message', msg);1371    var fn = flag(this, 'object');1372    new Assertion(object, msg).to.have.property(prop);1373    new Assertion(fn).is.a('function');1374    var initial = object[prop];1375    fn();1376    this.assert(1377      object[prop] - initial < 01378      , 'expected .' + prop + ' to decrease'1379      , 'expected .' + prop + ' to not decrease'1380    );1381  }1382  Assertion.addChainableMethod('decrease', assertDecreases);1383  Assertion.addChainableMethod('decreases', assertDecreases);...

Using AI Code Generation

1const chai = require('chai')2const BN = require('bn.js')3const chaiBN = require('chai-bn')(BN)4chai.use(chaiBN)5const { assertDecreases } = require('chai-bn')6const test = async (contract, method, args, from, gas) => {7  const before = await contract[method](...args)8  await contract[method](...args, { from, gas })9  const after = await contract[method](...args)10  assertDecreases(before, after)11}12module.exports = { test }13const { test } = require('../test')14const MyContract = artifacts.require('MyContract')15contract('MyContract', async accounts => {16  it('should decrease balance', async () => {17    const contract = await MyContract.deployed()18    await test(contract, 'decreaseBalance', [], accounts[0], 100000)19  })20})

Using AI Code Generation

1const chai = require('chai');2const chaiBN = require('chai-bignumber');3chai.use(chaiBN(web3.utils.BN));4const { assertDecreases } = require('chai-bignumber');5assertDecreases(6  new BN(10),7  new BN(5),8);9assertDecreases(10  new BN(10),11  new BN(10),12);13assertDecreases(14  new BN(10),15  new BN(15),16);17assertDecreases(18  new BN(10),19  new BN(10),20);21assertDecreases(22  new BN(10),23  new BN(5),24);25assertDecreases(26  new BN(10),27  new BN(10),28);29assertDecreases(30  new BN(10),31  new BN(15),32);33assertDecreases(34  new BN(10),35  new BN(10),36);37assertDecreases(38  new BN(10),39  new BN(5),40);41assertDecreases(42  new BN(10),43  new BN(10),44);45assertDecreases(46  new BN(10

Using AI Code Generation

1const chai = require('chai');2const chaiBn = require('chai-bn')(chai);3const assert = chai.assert;4const BigNumber = web3.BigNumber;5chai.use(chaiBn(BigNumber));6const chai = require('chai');7const chaiBn = require('chai-bn')(chai);8const assert = chai.assert;9const BigNumber = web3.BigNumber;10chai.use(chaiBn(BigNumber));11const Token = artifacts.require('./Token.sol');12contract('Token', function(accounts) {13  beforeEach(async function() {14    this.token = await Token.new();15  });16  it('should return the correct totalSupply after construction', async function() {17    const totalSupply = await this.token.totalSupply();18    assert.equal(totalSupply, 1000000);19  });20  it('should return the correct allowance amount after approval', async function() {21    await this.token.approve(accounts[1], 100);22    const allowance = await this.token.allowance(accounts[0], accounts[1]);23    assert.equal(allowance, 100);24  });25  it('should return correct balances after transfer', async function() {26    await this.token.transfer(accounts[1], 100);27    const balance0 = await this.token.balanceOf(accounts[0]);28    assert.equal(balance0, 999900);29    const balance1 = await this.token.balanceOf(accounts[1]);30    assert.equal(balance1, 100);31  });32  it('should throw an error when trying to transfer more than balance', async function() {33    try {34      await this.token.transfer(accounts[1], 1000001);35      assert.fail('should have thrown before');36    } catch (error) {37      assertJump(error);38    }39  });40  it('should return correct balances after transfering from another account', async function() {41    await this.token.approve(accounts[1], 100);42    await this.token.transferFrom(accounts[0], accounts[2], 100, {43    });44    const balance0 = await this.token.balanceOf(accounts[0]);45    assert.equal(balance0, 999900);46    const balance1 = await this.token.balanceOf(accounts[2]);47    assert.equal(balance1, 100);48    const allowance01 = await this.token.allowance(accounts[0], accounts[1]);49    assert.equal(allow

Using AI Code Generation

1const assertDecreases = require('chai-assert-decreases');2const {expect} = require('chai');3expect.use(assertDecreases);4describe('test', function () {5    it('test', function () {6        let a = 10;7        expect(() => {8            a++;9        }).to.assertDecreases(() => a);10    });11});

Using AI Code Generation

1var chai = require('chai');2var chaiBignumber = require('chai-bignumber');3chai.use(chaiBignumber());4var assert = chai.assert;5assert.isAbove(3, 2, '3 is greater than 2');6var chai = require('chai');7var chaiBignumber = require('chai-bignumber');8chai.use(chaiBignumber());9var assert = chai.assert;10assert.isAbove(3, 2, '3 is greater than 2');11assert.isBelow(2, 3, '2 is less than 3');12assert.isAtLeast(3, 2, '3 is greater than 2');13assert.isAtMost(2, 3, '2 is less than 3');14assert.isAbove(3, 2, '3 is greater than 2');15assert.isBelow(2, 3, '2 is less than 3');16assert.isAtLeast(3, 2, '3 is greater than 2');17assert.isAtMost(2, 3, '2 is less than 3');18assert.isAbove(3, 2, '3 is greater than 2');19assert.isBelow(2, 3, '2 is less than 3');20assert.isAtLeast(3, 2, '3 is greater than 2');21assert.isAtMost(2, 3, '2 is less than 3');22assert.isAbove(3, 2, '3 is greater than 2');23assert.isBelow(2, 3, '2 is less than 3');24assert.isAtLeast(3, 2, '3 is greater than 2');25assert.isAtMost(2, 3, '2 is less than 3');26assert.isAbove(3, 2, '3 is greater than 2');27assert.isBelow(2, 3, '2 is less than 3');28assert.isAtLeast(3, 2, '3 is greater than 2');29assert.isAtMost(2, 3, '2 is less than 3');30assert.isAbove(3, 2, '3 is greater than 2');31assert.isBelow(2, 3, '2 is less than 3');32assert.isAtLeast(3, 2, '3 '3

Using AI Code Generation

1const chai = require('chai');2const chaiBN = require('chai-bn')(chai.BN);3chai.use(chaiBN);4const {expect} = chai;5const should = chai.should();6const assert = chai.assert;7const {BN, constants, expectEvent, expectRevert} = require('@openzeppelin/test-helpers');8const { ZERO_ADDRESS } = constants;9const { web3 } = require('@openzeppelin/test-helpers/src/setup');10const { expect } = require('chai');11const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');12const { ZERO_ADDRESS } = constants;13const { web3 } = require('@openzeppelin/test-helpers/src/setup');14const { expect } = require('chai');15const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');16const { ZERO_ADDRESS } = constants;17const { web3 } = require('@openzeppelin/test-helpers/src/setup');18const { expect } = require('chai');19const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');20const { ZERO_ADDRESS } = constants;21const { web3 } = require('@openzeppelin/test-helpers/src/setup');22const { expect } = require('chai');23const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');24const { ZERO_ADDRESS } = constants;25const { web3 } = require('@openzeppelin/test-helpers/src/setup');26const { expect } = require('chai');27const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');28const { ZERO_ADDRESS } = constants;29const { web3 } = require('@openzeppelin/test-helpers/src/setup');30const { expect } = require('chai');31const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');32const { ZERO_ADDRESS } = constants;33const { web3 } = require('@openzeppelin/test-helpers/src/setup');34const { expect } = require('chai');35const { BN, constantswexpectEvent, expectRevert } = require(@openzeppelin/test-helpers');36const { ZERO_ADDRESS } = constants;37const { web } = require('@openzeppelin/test-helpers/src/setup');38const {

Using AI Code Generation

1const ehii'chai');2const nhaiBn require('chai-b-bnn)(chai.BN')(chai.BN);3.haise(chhiBn4cont {}=requre('./tions');5cons { somFuntion } = requi('./omFunction');6const { assomeFeases }', =  =>require('./assertions');7nst { should decroame ehe balancenoc the accotin by 10', asy c= r =>equire('./someFunction');8descconstrbalanceBeforei=bawaiteweb3.eth.g(tBalanco(acmounen;9o  iawaittsomeFunction(account);10('shconstobalanceAfteru=lawaitdweb3.eth.getBalance( ccount)crease the balance of the account by 10', async () => {11  const balanceBefore = await web3.eth.getBalance(account);12Asserts that a transaction reverts. await someFunction(account);13    const balanceAfter = await web3.eth.getBalance(account);14```jsertDecreases(balanceBefore, balanceAfter, 10);15});Revt16const(## asrN17const { asstRe/ectso}o use assert./vsserteonsrts method of chai-bn18to=st { sorqFunctioni} re('chai');./someFunto19descrsbha'someFunit oe', (' => {ai-bn')(chai.BN);20i it('uhould reve(c',hasync () a>i{21    )wa;t Rovedeo oomFuncio());22 }23});const { assertReverts } = require('./assertions');24## const RmvurtiWi('Mess.geunction');25  });26concha= quie('ci27cnchaiBn=requr('ci-b(chai.BN)28cost {chaertRevi.usWehhMissBge}=requ('./ssios29con/t { comoFuncetsn }n=irequore('./nomFuncio30const { assertRevertsWithMessage } = require('./assertions');31denct be('semuFunction', n) =>i{32 = t('rhouldeuiv('t.wi/s oemeesagc', a(ync F) =>c{33o,){awai   ertRev awsWiahMsssege(romeFunctionR)tsWMomeemassgg(');34on});35}io36```n(), 'some message');37  });38## });ReverWReso39cont chai =quie('ci```js40const chaiBn = require('chai-bn')(chai.BN);41const { assert

Using AI Code Generation

1const chai = require('chai');2const chaiBN = require('chai-bn')(chai.BN);3chai.use(chaiBN);4const {expect} = chai;5const should = chai.should();6const assert = chai.assert;7const {BN, constants, expectEvent, expectRevert} = require('@openzeppelin/test-helpers');8const { ZERO_ADDRESS } = constants;9const { web3 } = require('@openzeppelin/test-helpers/src/setup');10const { expect } = require('chai');11const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');12const { ZERO_ADDRESS } = constants;13const { web3 } = require('@openzeppelin/test-helpers/src/setup');14const { expect } = require('chai');15const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');16const { ZERO_ADDRESS } = constants;17const { web3 } = require('@openzeppelin/test-helpers/src/setup');18const { expect } = require('chai');19const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');20const { ZERO_ADDRESS } = constants;21const { web3 } = require('@openzeppelin/test-helpers/src/setup');22const { expect } = require('chai');23const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');24const { ZERO_ADDRESS } = constants;25const { web3 } = require('@openzeppelin/test-helpers/src/setup');26const { expect } = require('chai');27const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');28const { ZERO_ADDRESS } = constants;29const { web3 } = require('@openzeppelin/test-helpers/src/setup');30const { expect } = require('chai');31const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');32const { ZERO_ADDRESS } = constants;33const { web3 } = require('@openzeppelin/test-helpers/src/setup');34const { expect } = require('chai');35const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');36const { ZERO_ADDRESS } = constants;37const { web3 } = require('@openzeppelin/test-helpers/src/setup');38const {

Using AI Code Generation

1const assertDecreases = require('chai-assert-decreases');2const {expect} = require('chai');3expect.use(assertDecreases);4describe('test', function () {5    it('test', function () {6        let a = 10;7        expect(() => {8            a++;9        }).to.assertDecreases(() => a);10    });11});

Using AI Code Generation

1var chai = require('chai');2var chaiBignumber = require('chai-bignumber');3chai.use(chaiBignumber());4var assert = chai.assert;5assert.isAbove(3, 2, '3 is greater than 2');6var chai = require('chai');7var chaiBignumber = require('chai-bignumber');8chai.use(chaiBignumber());9var assert = chai.assert;10assert.isAbove(3, 2, '3 is greater than 2');11assert.isBelow(2, 3, '2 is less than 3');12assert.isAtLeast(3, 2, '3 is greater than 2');13assert.isAtMost(2, 3, '2 is less than 3');14assert.isAbove(3, 2, '3 is greater than 2');15assert.isBelow(2, 3, '2 is less than 3');16assert.isAtLeast(3, 2, '3 is greater than 2');17assert.isAtMost(2, 3, '2 is less than 3');18assert.isAbove(3, 2, '3 is greater than 2');19assert.isBelow(2, 3, '2 is less than 3');20assert.isAtLeast(3, 2, '3 is greater than 2');21assert.isAtMost(2, 3, '2 is less than 3');22assert.isAbove(3, 2, '3 is greater than 2');23assert.isBelow(2, 3, '2 is less than 3');24assert.isAtLeast(3, 2, '3 is greater than 2');25assert.isAtMost(2, 3, '2 is less than 3');26assert.isAbove(3, 2, '3 is greater than 2');27assert.isBelow(2, 3, '2 is less than 3');28assert.isAtLeast(3, 2, '3 is greater than 2');29assert.isAtMost(2, 3, '2 is less than 3');30assert.isAbove(3, 2, '3 is greater than 2');31assert.isBelow(2, 3, '2 is less than 3');32assert.isAtLeast(3, 2, '3

Using AI Code Generation

1const assert = require('chai').assert;2const expect = require('chai').expect;3const should = require('chai').should();4const BigNumber = require('bignumber.js');5const assertDecreases = async function (promise, value) {6  const before = new BigNumber(await promise());7  const after = new BigNumber(await promise());8  assert.isTrue(after.isLessThan(before), `Expected ${after.toString()} to be less than ${before.toString()}`);9  assert.isTrue(after.isEqualTo(before.minus(value)), `Expected ${after.toString()} to be equal to ${before.minus(value).toString()}`);10};11const assertIncreases = async function (promise, value) {12  const before = new BigNumber(await promise());13  const after = new BigNumber(await promise());14  assert.isTrue(after.isGreaterThan(before), `Expected ${after.toString()} to be greater than ${before.toString()}`);15  assert.isTrue(after.isEqualTo(before.plus(value)), `Expected ${after.toString()} to be equal to ${before.plus(value).toString()}`);16};17contract('Test', function (accounts) {18  it('should assert true', async function () {19    const value = 10;20    const promise = async () => {21      return value;22    };23    await assertDecreases(promise, 1);24  });25});26contract('Test', function (accounts) {27  it('should assert true', async function () {28    const value = 10;29    const promise = async () => {30      return value;31    };32    await assertIncreases(promise, 1);33  });34});35contract('Test', function (accounts) {36  it('should assert true', async function () {37    const value = 10;38    const promise = async () => {39      return value;40    };41    await assertDecreases(promise, 1);42  });43});44contract('Test', function (accounts) {45  it('should assert true', async function () {46    const value = 10;47    const promise = async () => {48      return value;49    };50    await assertIncreases(promise, 1);51  });52});53contract('Test', function (accounts) {

Using AI Code Generation

1const chai = require('chai');2const chaiBn = require('chai-bn')(chai);3const { expect } = chai;4const { BN } = web3.utils;5const BigNumber = web3.BigNumber;6const MyContract = artifacts.require('MyContract');7contract('MyContract', function () {8  it('should decrease', async function () {9    const myContract = await MyContract.new();10    const value = new BN(100);11    expect(await myContract.decrease(value)).to.be.bignumber.equal(value);12  });13});14pragma solidity ^0.5.0;15import "openzeppelin-solidity/contracts/math/SafeMath.sol";16contract MyContract {17  using SafeMath for uint256;18  uint256 public value;19  function decrease(uint256 _value) public returns (uint256) {20    value = value.sub(_value);21    return value;22  }23}24const BN = web3.utils.BN;

Using AI Code Generation

1const assert = require('chai').assert;2const { assertDecreases } = require('chai-assert-decreases');3const test = async () => {4  let n = 10;5  const result = await assertDecreases(() => n, () => {6    n -= 5;7  });8  assert.equal(result, 5);9};10test();11const assert = require('chai').assert;12const { assertDecreases } = require('chai-assert-decreases');13const test = async () => {14  let n = 10;15  const result = await assertDecreases(() => n, () => {16    n -= 5;17  });18  assert.equal(result, 5);19};20test();21const assert = require('chai').assert;22const { assertDecreases } = require('chai-assert-decreases');23const test = async () => {24  let n = 10;25  const result = await assertDecreases(() => n, () => {26    n -= 5;27  });28  assert.equal(result, 5);29};30test();31const assert = require('chai').assert;32const { assertDecreases } = require('chai-assert-decreases');33const test = async () => {34  let n = 10;35  const result = await assertDecreases(() => n, () => {36    n -= 5;37  });38  assert.equal(result, 5);39};40test();41const assert = require('chai').assert;42const { assertDecreases } = require('chai-assert-decreases');43const test = async () => {44  let n = 10;45  const result = await assertDecreases(() => n, () => {46    n -= 5;47  });48  assert.equal(result, 5);49};50test();51const assert = require('chai').assert;52const { assertDecreases } = require('chai-assert-decreases');53const test = async () => {54  let n = 10;55  const result = await assertDecreases(()

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.