How to use is method of org.hamcrest.core.Is class

Best junit code snippet using org.hamcrest.core.Is.is

Source:CoreMatchers.java

...51  public static <LHS> org.hamcrest.core.CombinableMatcher.CombinableEitherMatcher<LHS> either(org.hamcrest.Matcher<? super LHS> matcher) {52    return org.hamcrest.core.CombinableMatcher.either(matcher);53  }54  /**55   * Wraps an existing matcher, overriding its description with that specified.  All other functions are56   * delegated to the decorated matcher, including its mismatch description.57   * For example:58   * <pre>describedAs("a big decimal equal to %0", equalTo(myBigDecimal), myBigDecimal.toPlainString())</pre>59   * 60   * @param description61   *     the new description for the wrapped matcher62   * @param matcher63   *     the matcher to wrap64   * @param values65   *     optional values to insert into the tokenised description66   */67  public static <T> org.hamcrest.Matcher<T> describedAs(java.lang.String description, org.hamcrest.Matcher<T> matcher, java.lang.Object... values) {68    return org.hamcrest.core.DescribedAs.describedAs(description, matcher, values);69  }70  /**71   * Creates a matcher for {@link Iterable}s that only matches when a single pass over the72   * examined {@link Iterable} yields items that are all matched by the specified73   * <code>itemMatcher</code>.74   * For example:75   * <pre>assertThat(Arrays.asList("bar", "baz"), everyItem(startsWith("ba")))</pre>76   * 77   * @param itemMatcher78   *     the matcher to apply to every item provided by the examined {@link Iterable}79   */80  public static <U> org.hamcrest.Matcher<java.lang.Iterable<? extends U>> everyItem(org.hamcrest.Matcher<U> itemMatcher) {81    return org.hamcrest.core.Every.everyItem(itemMatcher);82  }83  /**84   * Decorates another Matcher, retaining its behaviour, but allowing tests85   * to be slightly more expressive.86   * For example:87   * <pre>assertThat(cheese, is(equalTo(smelly)))</pre>88   * instead of:89   * <pre>assertThat(cheese, equalTo(smelly))</pre>90   */91  public static <T> org.hamcrest.Matcher<T> is(org.hamcrest.Matcher<T> matcher) {92    return org.hamcrest.core.Is.is(matcher);93  }94  /**95   * A shortcut to the frequently used <code>is(equalTo(x))</code>.96   * For example:97   * <pre>assertThat(cheese, is(smelly))</pre>98   * instead of:99   * <pre>assertThat(cheese, is(equalTo(smelly)))</pre>100   */101  public static <T> org.hamcrest.Matcher<T> is(T value) {102    return org.hamcrest.core.Is.is(value);103  }104  /**105   * Provided to cause compile time error when used in preference to a possible runtime error if106   * this was not here.107   *108   * <p>This method was removed upstream between Hamcrest 1.1 and 1.3 in favour of the109   * instanceOf(Class) method. Unfortunately, existing usages of it could still compile against the110   * {@link #is(Object)} method instead. Although not every existing usage would compile111   * successfully it is possible that some could and that would result in a change in the runtime112   * behavior that could be difficult to detect and fix. This change aims to turn any significant113   * usage of this method into a compile time error.114   *115   * @deprecated Use instanceOf(SomeClass.class) instead.116   */117  public static void is(java.lang.Class<?> type) {118  }119  /**120   * A shortcut to the frequently used <code>is(instanceOf(SomeClass.class))</code>.121   * For example:122   * <pre>assertThat(cheese, isA(Cheddar.class))</pre>123   * instead of:124   * <pre>assertThat(cheese, is(instanceOf(Cheddar.class)))</pre>125   */126  public static <T> org.hamcrest.Matcher<T> isA(java.lang.Class<T> type) {127    return org.hamcrest.core.Is.isA(type);128  }129  /**130   * Creates a matcher that always matches, regardless of the examined object.131   */132  public static org.hamcrest.Matcher<java.lang.Object> anything() {133    return org.hamcrest.core.IsAnything.anything();134  }135  /**136   * Creates a matcher that always matches, regardless of the examined object, but describes137   * itself with the specified {@link String}.138   * 139   * @param description140   *     a meaningful {@link String} used when describing itself141   */142  public static org.hamcrest.Matcher<java.lang.Object> anything(java.lang.String description) {143    return org.hamcrest.core.IsAnything.anything(description);144  }145  /**146   * Creates a matcher for {@link Iterable}s that only matches when a single pass over the147   * examined {@link Iterable} yields at least one item that is matched by the specified148   * <code>itemMatcher</code>.  Whilst matching, the traversal of the examined {@link Iterable}149   * will stop as soon as a matching item is found.150   * For example:151   * <pre>assertThat(Arrays.asList("foo", "bar"), hasItem(startsWith("ba")))</pre>152   * 153   * @param itemMatcher154   *     the matcher to apply to items provided by the examined {@link Iterable}155   */156  public static <T> org.hamcrest.Matcher<java.lang.Iterable<? super T>> hasItem(org.hamcrest.Matcher<? super T> itemMatcher) {157    return org.hamcrest.core.IsCollectionContaining.<T>hasItem(itemMatcher);158  }159  /**160   * Creates a matcher for {@link Iterable}s that only matches when a single pass over the161   * examined {@link Iterable} yields at least one item that is equal to the specified162   * <code>item</code>.  Whilst matching, the traversal of the examined {@link Iterable}163   * will stop as soon as a matching item is found.164   * For example:165   * <pre>assertThat(Arrays.asList("foo", "bar"), hasItem("bar"))</pre>166   * 167   * @param item168   *     the item to compare against the items provided by the examined {@link Iterable}169   */170  public static <T> org.hamcrest.Matcher<java.lang.Iterable<? super T>> hasItem(T item) {171    return org.hamcrest.core.IsCollectionContaining.<T>hasItem(item);172  }173  /**174   * Creates a matcher for {@link Iterable}s that matches when consecutive passes over the175   * examined {@link Iterable} yield at least one item that is matched by the corresponding176   * matcher from the specified <code>itemMatchers</code>.  Whilst matching, each traversal of177   * the examined {@link Iterable} will stop as soon as a matching item is found.178   * For example:179   * <pre>assertThat(Arrays.asList("foo", "bar", "baz"), hasItems(endsWith("z"), endsWith("o")))</pre>180   * 181   * @param itemMatchers182   *     the matchers to apply to items provided by the examined {@link Iterable}183   */184  @SafeVarargs185  public static <T> org.hamcrest.Matcher<java.lang.Iterable<T>> hasItems(org.hamcrest.Matcher<? super T>... itemMatchers) {186    return org.hamcrest.core.IsCollectionContaining.<T>hasItems(itemMatchers);187  }188  /**189   * Creates a matcher for {@link Iterable}s that matches when consecutive passes over the190   * examined {@link Iterable} yield at least one item that is equal to the corresponding191   * item from the specified <code>items</code>.  Whilst matching, each traversal of the192   * examined {@link Iterable} will stop as soon as a matching item is found.193   * For example:194   * <pre>assertThat(Arrays.asList("foo", "bar", "baz"), hasItems("baz", "foo"))</pre>195   * 196   * @param items197   *     the items to compare against the items provided by the examined {@link Iterable}198   */199  @SafeVarargs200  public static <T> org.hamcrest.Matcher<java.lang.Iterable<T>> hasItems(T... items) {201    return org.hamcrest.core.IsCollectionContaining.<T>hasItems(items);202  }203  /**204   * Creates a matcher that matches when the examined object is logically equal to the specified205   * <code>operand</code>, as determined by calling the {@link java.lang.Object#equals} method on206   * the <b>examined</b> object.207   * 208   * <p>If the specified operand is <code>null</code> then the created matcher will only match if209   * the examined object's <code>equals</code> method returns <code>true</code> when passed a210   * <code>null</code> (which would be a violation of the <code>equals</code> contract), unless the211   * examined object itself is <code>null</code>, in which case the matcher will return a positive212   * match.</p>213   * 214   * <p>The created matcher provides a special behaviour when examining <code>Array</code>s, whereby215   * it will match if both the operand and the examined object are arrays of the same length and216   * contain items that are equal to each other (according to the above rules) <b>in the same217   * indexes</b>.</p> 218   * For example:219   * <pre>220   * assertThat("foo", equalTo("foo"));221   * assertThat(new String[] {"foo", "bar"}, equalTo(new String[] {"foo", "bar"}));222   * </pre>223   */224  public static <T> org.hamcrest.Matcher<T> equalTo(T operand) {225    return org.hamcrest.core.IsEqual.equalTo(operand);226  }227  /**228   * Creates an {@link org.hamcrest.core.IsEqual} matcher that does not enforce the values being229   * compared to be of the same static type.230   */231  public static org.hamcrest.Matcher<java.lang.Object> equalToObject(java.lang.Object operand) {232    return org.hamcrest.core.IsEqual.equalToObject(operand);233  }234  /**235   * Creates a matcher that matches when the examined object is an instance of the specified <code>type</code>,236   * as determined by calling the {@link java.lang.Class#isInstance(Object)} method on that type, passing the237   * the examined object.238   * 239   * <p>The created matcher forces a relationship between specified type and the examined object, and should be240   * used when it is necessary to make generics conform, for example in the JMock clause241   * <code>with(any(Thing.class))</code></p>242   * For example:243   * <pre>assertThat(new Canoe(), instanceOf(Canoe.class));</pre>244   */245  public static <T> org.hamcrest.Matcher<T> any(java.lang.Class<T> type) {246    return org.hamcrest.core.IsInstanceOf.any(type);247  }248  /**249   * Creates a matcher that matches when the examined object is an instance of the specified <code>type</code>,250   * as determined by calling the {@link java.lang.Class#isInstance(Object)} method on that type, passing the251   * the examined object.252   * 253   * <p>The created matcher assumes no relationship between specified type and the examined object.</p>254   * For example:255   * <pre>assertThat(new Canoe(), instanceOf(Paddlable.class));</pre>256   */257  public static <T> org.hamcrest.Matcher<T> instanceOf(java.lang.Class<?> type) {258    return org.hamcrest.core.IsInstanceOf.instanceOf(type);259  }260  /**261   * Creates a matcher that wraps an existing matcher, but inverts the logic by which262   * it will match.263   * For example:264   * <pre>assertThat(cheese, is(not(equalTo(smelly))))</pre>265   * 266   * @param matcher267   *     the matcher whose sense should be inverted268   */269  public static <T> org.hamcrest.Matcher<T> not(org.hamcrest.Matcher<T> matcher) {270    return org.hamcrest.core.IsNot.not(matcher);271  }272  /**273   * A shortcut to the frequently used <code>not(equalTo(x))</code>.274   * For example:275   * <pre>assertThat(cheese, is(not(smelly)))</pre>276   * instead of:277   * <pre>assertThat(cheese, is(not(equalTo(smelly))))</pre>278   * 279   * @param value280   *     the value that any examined object should <b>not</b> equal281   */282  public static <T> org.hamcrest.Matcher<T> not(T value) {283    return org.hamcrest.core.IsNot.not(value);284  }285  /**286   * A shortcut to the frequently used <code>not(nullValue())</code>.287   * For example:288   * <pre>assertThat(cheese, is(notNullValue()))</pre>289   * instead of:290   * <pre>assertThat(cheese, is(not(nullValue())))</pre>291   */292  public static org.hamcrest.Matcher<java.lang.Object> notNullValue() {293    return org.hamcrest.core.IsNull.notNullValue();294  }295  /**296   * A shortcut to the frequently used <code>not(nullValue(X.class)). Accepts a297   * single dummy argument to facilitate type inference.</code>.298   * For example:299   * <pre>assertThat(cheese, is(notNullValue(X.class)))</pre>300   * instead of:301   * <pre>assertThat(cheese, is(not(nullValue(X.class))))</pre>302   * 303   * @param type304   *     dummy parameter used to infer the generic type of the returned matcher305   */306  public static <T> org.hamcrest.Matcher<T> notNullValue(java.lang.Class<T> type) {307    return org.hamcrest.core.IsNull.notNullValue(type);308  }309  /**310   * Creates a matcher that matches if examined object is <code>null</code>.311   * For example:312   * <pre>assertThat(cheese, is(nullValue())</pre>313   */314  public static org.hamcrest.Matcher<java.lang.Object> nullValue() {315    return org.hamcrest.core.IsNull.nullValue();316  }317  /**318   * Creates a matcher that matches if examined object is <code>null</code>. Accepts a319   * single dummy argument to facilitate type inference.320   * For example:321   * <pre>assertThat(cheese, is(nullValue(Cheese.class))</pre>322   * 323   * @param type324   *     dummy parameter used to infer the generic type of the returned matcher325   */326  public static <T> org.hamcrest.Matcher<T> nullValue(java.lang.Class<T> type) {327    return org.hamcrest.core.IsNull.nullValue(type);328  }329  /**330   * Creates a matcher that matches only when the examined object is the same instance as331   * the specified target object.332   * 333   * @param target334   *     the target instance against which others should be assessed335   */336  public static <T> org.hamcrest.Matcher<T> sameInstance(T target) {337    return org.hamcrest.core.IsSame.sameInstance(target);338  }339  /**340   * Creates a matcher that matches only when the examined object is the same instance as341   * the specified target object.342   * 343   * @param target344   *     the target instance against which others should be assessed345   */346  public static <T> org.hamcrest.Matcher<T> theInstance(T target) {347    return org.hamcrest.core.IsSame.theInstance(target);348  }349  /**350   * Creates a matcher that matches if the examined {@link String} contains the specified351   * {@link String} anywhere.352   * For example:353   * <pre>assertThat("myStringOfNote", containsString("ring"))</pre>354   * ...

Source:HamcrestCoreMatchersTest.java

...14import static org.hamcrest.CoreMatchers.everyItem;15import static org.hamcrest.CoreMatchers.hasItem;16import static org.hamcrest.CoreMatchers.hasItems;17import static org.hamcrest.CoreMatchers.instanceOf;18import static org.hamcrest.CoreMatchers.is;19import static org.hamcrest.CoreMatchers.isA;20import static org.hamcrest.CoreMatchers.not;21import static org.hamcrest.CoreMatchers.notNullValue;22import static org.hamcrest.CoreMatchers.nullValue;23import static org.hamcrest.CoreMatchers.sameInstance;24import static org.hamcrest.CoreMatchers.startsWith;25import static org.hamcrest.CoreMatchers.startsWithIgnoringCase;26import static org.hamcrest.CoreMatchers.theInstance;27import static org.hamcrest.MatcherAssert.assertThat;28import java.util.List;29import org.junit.jupiter.api.Test;30import com.google.common.collect.Lists;3132public class HamcrestCoreMatchersTest {3334  @Test35  public void givenTestInput_WhenUsingIsForMatch() {3637    // GIVEN38    String testString = "hamcrest core";3940    // ASSERT41    assertThat(testString, is("hamcrest core"));42    assertThat(testString, is(equalTo("hamcrest core")));43  }4445  @Test46  public void givenDifferentStaticTypeTestInput_WhenUsingEqualToObject_ThenCorrect() {4748    // GIVEN49    Object original = 100;5051    // ASSERT52    assertThat(original, equalToObject(100));53  }5455  @Test56  public void givenTestInput_WhenUsingInstanceOfForClassTypeCheck() {5758    assertThat("hamcrest", is(instanceOf(String.class)));59  }6061  @Test62  public void givenTestInput_WhenUsingIsA_ThenAssertType() {6364    assertThat("hamcrest core", isA(String.class));65  }6667  @Test68  public void givenTestInput_WhenUsingEqualToMatcherForEquality() {6970    // GIVEN71    String actualString = "Hamcrest Core";72    List<String> actualList = Lists.newArrayList("hamcrest", "core");7374    // ASSERT75    assertThat(actualString, is(equalTo("Hamcrest Core")));76    assertThat(actualList, is(equalTo(Lists.newArrayList("hamcrest", "core"))));77  }7879  @Test80  public void givenTestInput_WhenUsingNotForMatch() {8182    // GIVEN83    String testString = "hamcrest";8485    // ASSERT86    assertThat(testString, not("hamcrest core"));87    assertThat(testString, is(not(equalTo("hamcrest core"))));88    assertThat(testString, is(not(instanceOf(Integer.class))));89  }9091  @Test92  public void givenTestInput_WhenUsingNullValueForNullCheck() {9394    // GIVEN95    Integer nullObject = null;9697    // ASSERT98    assertThat(nullObject, is(nullValue()));99    assertThat(nullObject, is(nullValue(Integer.class)));100  }101102  @Test103  public void givenTestInput_WhenUsingNotNullValueForNotNullCheck() {104105    // GIVEN106    Integer testNumber = 123;107108    // ASSERT109    assertThat(testNumber, is(notNullValue()));110    assertThat(testNumber, is(notNullValue(Integer.class)));111  }112113  @Test114  public void givenString_WhenStartsWith_ThenCorrect() {115116    // GIVEN117    String testString = "hamcrest core";118119    // ASSERT120    assertThat(testString, startsWith("hamcrest"));121  }122123  @Test124  public void giveString_WhenStartsWithIgnoringCase_ThenCorrect() {125126    // GIVEN127    String testString = "hamcrest core";128129    // ASSERT130    assertThat(testString, startsWithIgnoringCase("HAMCREST"));131  }132133  @Test134  public void givenString_WhenEndsWith_ThenCorrect() {135136    // GIVEN137    String testString = "hamcrest core";138139    // ASSERT140    assertThat(testString, endsWith("core"));141  }142143  @Test144  public void givenString_WhenEndsWithIgnoringCase_ThenCorrect() {145146    // GIVEN147    String testString = "hamcrest core";148149    // ASSERT150    assertThat(testString, endsWithIgnoringCase("CORE"));151  }152153  @Test154  public void givenString_WhenContainsString_ThenCorrect() {155156    // GIVEN157    String testString = "hamcrest core";158159    // ASSERT160    assertThat(testString, containsString("co"));161  }162163  @Test164  public void givenString_WhenContainsStringIgnoringCase_ThenCorrect() {165166167    // GIVEN168    String testString = "hamcrest core";169170    // ASSERT171    assertThat(testString, containsStringIgnoringCase("CO"));172  }173174  @Test175  public void givenTestInput_WhenUsingHasItemInCollection() {176177    // GIVEN178    List<String> list = Lists.newArrayList("java", "spring", "baeldung");179180    // ASSERT181    assertThat(list, hasItem("java"));182    assertThat(list, hasItem(isA(String.class)));183  }184185186  @Test187  public void givenTestInput_WhenUsingHasItemsInCollection() {188189    // GIVEN190    List<String> list = Lists.newArrayList("java", "spring", "baeldung");191192    // ASSERT193    assertThat(list, hasItems("java", "baeldung"));194    assertThat(list, hasItems(isA(String.class), endsWith("ing")));195  }196197  @Test198  public void givenTestInput_WhenUsingAnyForClassType() {199200    assertThat("hamcrest", is(any(String.class)));201    assertThat("hamcrest", is(any(Object.class)));202  }203204  @Test205  public void givenTestInput_WhenUsingAllOfForAllMatchers() {206207    // GIVEN208    String testString = "Hamcrest Core";209210    // ASSERT211    assertThat(testString, allOf(startsWith("Ham"), endsWith("ore"), containsString("Core")));212  }213214  @Test215  public void givenTestInput_WhenUsingAnyOfForAnyMatcher() {216217    // GIVEN218    String testString = "Hamcrest Core";219220    // ASSERT221    assertThat(testString, anyOf(startsWith("Ham"), containsString("baeldung")));222  }223224  @Test225  public void givenTestInput_WhenUsingBothForMatcher() {226227    // GIVEN228    String testString = "Hamcrest Core Matchers";229230    // ASSERT231    assertThat(testString, both(startsWith("Ham")).and(containsString("Core")));232  }233234  @Test235  public void givenTestInput_WhenUsingEitherForMatcher() {236237    // GIVEN238    String testString = "Hamcrest Core Matchers";239240    // ASSERT241    assertThat(testString, either(startsWith("Bael")).or(containsString("Core")));242  }243244245  @Test246  public void givenTestInput_WhenUsingEveryItemForMatchInCollection() {247248    // GIVEN249    List<String> testItems = Lists.newArrayList("Common", "Core", "Combinable");250251    // ASSERT252    assertThat(testItems, everyItem(startsWith("Co")));253  }254255  @Test256  public void givenTwoTestInputs_WhenUsingSameInstanceForMatch() {257258    // GIVEN259    String string1 = "hamcrest";260    String string2 = string1;261262    // ASSERT263    assertThat(string1, is(sameInstance(string2)));264  }265266  @Test267  public void givenTwoTestInputs_WhenUsingTheInstanceForMatch() {268    // GIVEN269    String string1 = "hamcrest";270    String string2 = string1;271272    // ASSERT273    assertThat(string1, is(theInstance(string2)));274  }275276}277
...

Using AI Code Generation

1import static org.hamcrest.core.Is.is;2import static org.hamcrest.MatcherAssert.assertThat;3import org.junit.Test;4public class TestAssertThat {5    public void testAssertThat() {6        assertThat("This is the actual value", is("This is the expected value"));7    }8}9at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)10at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:8)11at com.tutorialspoint.junit.TestAssertThat.testAssertThat(TestAssertThat.java:16)12at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)13at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)14at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)15at java.lang.reflect.Method.invoke(Method.java:606)16at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)17at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)18at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)19at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)20at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)21at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)22at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)23at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)24at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)25at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)26at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)27at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)28at org.junit.runners.ParentRunner.run(ParentRunner.java:292)29at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)30at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)31at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)

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