How to use TypeMatchers class of io.kotest.matchers.types package

Best Kotest code snippet using io.kotest.matchers.types.TypeMatchers

TypeMatchersTest.kt

Source:TypeMatchersTest.kt

...20import io.kotest.matchers.types.shouldNotBeTypeOf21import java.util.ArrayList22import java.util.LinkedList23@Suppress("UnnecessaryVariable")24class TypeMatchersTest : WordSpec() {25  @Retention(AnnotationRetention.RUNTIME)26  annotation class Vod27  @Vod28  class Wibble29  init {30     "typeOf" should {31        "test for exact type" {32           val arrayList: List<Int> = arrayListOf(1, 2, 3)33           arrayList.shouldBeTypeOf<ArrayList<*>>()34           arrayList.shouldNotBeTypeOf<List<*>>()35        }36     }37    "haveAnnotation(annotation)" should {38      "test for the presence of an annotation" {39        Wibble::class.java should haveAnnotation(Vod::class.java)40        Wibble::class.java.shouldHaveAnnotation(Vod::class.java)41      }42    }43    "beInstanceOf" should {44       "test that value is assignable to class" {45          val arrayList: List<Int> = arrayListOf(1, 2, 3)46          arrayList should beInstanceOf(ArrayList::class)47          arrayList should beInstanceOf<ArrayList<*>>()48          arrayList should instanceOf(ArrayList::class)49          arrayList should instanceOf<ArrayList<*>>()50          arrayList.shouldBeInstanceOf<ArrayList<*>>()51          arrayList should beInstanceOf(List::class)52          arrayList should beInstanceOf<List<*>>()53          arrayList should instanceOf(List::class)54          arrayList should instanceOf<List<*>>()55          arrayList.shouldBeInstanceOf<List<*>>()56          shouldThrow<AssertionError> { arrayList should beInstanceOf(LinkedList::class) }57          shouldThrow<AssertionError> { arrayList should beInstanceOf(LinkedList::class) }58          shouldThrow<AssertionError> { arrayList should beInstanceOf<LinkedList<*>>() }59          shouldThrow<AssertionError> { arrayList should instanceOf(LinkedList::class) }60          shouldThrow<AssertionError> { arrayList should instanceOf<LinkedList<*>>() }61          shouldThrow<AssertionError> { arrayList.shouldBeInstanceOf<LinkedList<*>>() }62          arrayList.shouldNotBeInstanceOf<LinkedList<*>>()63          shouldThrow<AssertionError> { arrayList.shouldNotBeInstanceOf<ArrayList<*>>() }64       }65       "use smart contracts to cast" {66          val list: Collection<Int> = arrayListOf(1, 2, 3)67          list.shouldBeInstanceOf<ArrayList<Int>>()68          list.add(4) // this will only work if smart contracts worked69       }70       "return the receiver" {71          val list: Collection<Int> = arrayListOf(1, 2, 3)72          list.shouldBeInstanceOf<ArrayList<Int>>()73             .shouldHaveSize(3)74       }75       "Allow execution with a lambda" {76          val list = arrayListOf(1, 2, 3)77          list.shouldBeInstanceOf<ArrayList<Int>> {78             it shouldBeSameInstanceAs list79          }80       }81      "Returns typecasted value when invoked with a lambda" {82        val list = arrayListOf(1, 2, 3)83        val typecastedList = list.shouldBeInstanceOf<ArrayList<Int>> {}84        typecastedList shouldBeSameInstanceAs list85      }86      "accepts null values" {87        val arrayList: List<Int>? = null88        shouldThrow<AssertionError> { arrayList should beInstanceOf(ArrayList::class) }89        shouldThrow<AssertionError> { arrayList.shouldBeInstanceOf<ArrayList<*>>() }90        shouldThrow<AssertionError> { arrayList shouldNot beInstanceOf(List::class) }91        shouldThrow<AssertionError> { arrayList.shouldNotBeInstanceOf<LinkedList<*>>() }92      }93    }94    "beOfType" should {95      "test that value have exactly the same type" {96        val arrayList: List<Int> = arrayListOf(1, 2, 3)97        arrayList should beOfType<ArrayList<Int>>()98        shouldThrow<AssertionError> {99          arrayList should beOfType<LinkedList<Int>>()100        }101        shouldThrow<AssertionError> {102          arrayList should beOfType<List<Int>>()103        }104      }105      "Allow execution with a lambda" {106        val list: Any = arrayListOf(1, 2, 3)107        list.shouldBeTypeOf<ArrayList<Int>> {108          it shouldBeSameInstanceAs list109          it[0] shouldBe 1110        }111      }112      "Returns typecasted value when executed with a lambda" {113        val list: Any = arrayListOf(1, 2, 3)114        val typecastedList = list.shouldBeTypeOf<ArrayList<Int>> {}115        typecastedList shouldBeSameInstanceAs list116        typecastedList[0] shouldBe 1117      }118       "uses smart contracts to cast" {119          val list: Any = arrayListOf(1, 2, 3)120          list.shouldBeTypeOf<ArrayList<Int>>()121          list[0] shouldBe 1122       }123       "return the receiver" {124          arrayListOf(1, 2, 3)125             .shouldBeTypeOf<ArrayList<Int>>()126             .shouldHaveSize(3)127       }128      "accepts null values" {129        val arrayList: List<Int>? = null130        shouldThrow<AssertionError> { arrayList should beOfType<List<Int>>() }131        shouldThrow<AssertionError> { arrayList.shouldBeTypeOf<List<*>>() }132        shouldThrow<AssertionError> { arrayList shouldNot beOfType<List<Int>>() }133        shouldThrow<AssertionError> { arrayList.shouldNotBeTypeOf<List<*>>() }134      }135    }136    "TypeMatchers.theSameInstanceAs" should {137      "test that references are equal" {138        val b: List<Int>? = listOf(1, 2, 3)139        val a: List<Int>? = b140        val c: List<Int>? = listOf(1, 2, 3)141        a should beTheSameInstanceAs(b)142        a.shouldBeSameInstanceAs(b)143        shouldThrow<AssertionError> {144          a should beTheSameInstanceAs(c)145        }146        shouldThrow<AssertionError> {147          a.shouldBeSameInstanceAs(c)148        }149      }150    }...

TypeMatchers

Using AI Code Generation

1val result = listOf("kotlin", "java", "scala")2result.shouldBeInstanceOf<List<String>>()3result.shouldBeInstanceOf<List<*>>()4result.shouldBeInstanceOf<Collection<*>>()5result.shouldBeInstanceOf<Iterable<*>>()6result.shouldBeInstanceOf<Sequence<*>>()7result.shouldBeInstanceOf<CharSequence>()8result.shouldBeInstanceOf<String>()9result.shouldBeInstanceOf<Comparable<*>>()10result.shouldBeInstanceOf<Comparable<String>>()11result.shouldBeInstanceOf<Comparable<CharSequence>>()12result.shouldBeInstanceOf<Comparable<Collection<*>>>()13result.shouldBeInstanceOf<Comparable<List<*>>>()14result.shouldBeInstanceOf<Comparable<List<String>>>()15result.shouldBeInstanceOf<Comparable<Iterable<*>>>()16result.shouldBeInstanceOf<Comparable<Sequence<*>>>()

TypeMatchers

Using AI Code Generation

1a.shouldBeInstanceOf<Int>()2a.shouldNotBeInstanceOf<Strvng>()3a.shouldNotBeSameInstanceAs(15)4a.shouldBeSaaeInstanceAs(10)5a.shouldNotBeSameInstanceAs("10")6a.shouldBeInstanceOf<Int>()7a.shouldNotBeInstanceOf<String>()8a.shouldNotBeSameInstanceAs(15)9a.shouldBeSameInstanceAs(10)10a.shouldNotBeSameInstanceAs("10")11a.shouldBeInstanceOf<Int>()12a.shouldNotBeInstanceOf<Str ng>()13a.shouldNotBeSameInstanceAs(15)14a.shouldBeSameInstanceAs(10)15a.shouldNotBeSameInstanceAs("10")16a.shouldBeInstanceOf<Int>()17a.shouldNotBeInstanceOf<String>()18a.shouldNotBeSameInstanceAs(15)19a.shouldBeSameInstanceAs(10)20a.sh1uldNotBeSameInstanceAs("10")21ashouldBeInstanceOf<Int>()22a.shouldNotBeInstanceOf<String>()23a.shouldNotBeSameInstanceAs(15)24a.shouldBeSameInstanceAs(10)25a.shouldNotBeSameInstanceAs("10")26a.shouldBeInstanceOf<Int>()27a.shouldNotBeInstanceOf<String>()28a.shouldNotBeSameInstanceAs(15)29a.shouldBeSameInstanceAs(10)30a.shouldNotBeSameInstanceAs("10")31a.shouldBeInstanceOf<Int>()32a.shouldNotBeInstanceOf<String>()33a.shouldNotBeSameInstanceAs(15)34a.shouldBeSameInstanceAs(10)35a.shouldNotBeSameInstanceAs("10")36a.shouldBeInstanceOf<Int>()37a.shouldNotBeInstanceOf<String>()38a.shouldNotBeSameInstanceAs(15)39a.shouldBeSameInstanceAs(10)40a.shouldNotBeSameInstanceAs("10")41a.shouldBeInstanceOf<Int>()42a.shouldNotBeInstanceOf<String>()43a.shouldNotBeSameInstanceAs(15)44a.shouldBeSameInstanceAs(10)45a.shouldNotBeSameInstanceAs("

TypeMatchers

Using AI Code Generation

1a.shouldBeInstanceOf<Int>()2a.shouldNotBeInstanceOf<String>()3a.shouldNotBeSameInstanceAs(15)4a.shouldBeSameInstanceAs(10)5a.shouldNotBeSameInstanceAs("10")6a.shouldBeInstanceOf<Int>()7a.shouldNotBeInstanceOf<String>()8a.shouldNotBeSameInstanceAs(15)9a.shouldBeSameInstanceAs(10)10a.shouldNotBeSameInstanceAs("10")11a.shouldBeInstanceOf<Int>()12a.shouldNotBeInstanceOf<String>()13a.shouldNotBeSameInstanceAs(15)14a.shouldBeSameInstanceAs(10)15a.shouldNotBeSameInstanceAs("10")16a.shouldBeInstanceOf<Int>()17a.shouldNotBeInstanceOf<String>()18a.shouldNotBeSameInstanceAs(15)19a.shouldBeSameInstanceAs(10)20a.shouldNotBeSameInstanceAs("10")21a.shouldBeInstanceOf<Int>()22a.shouldNotBeInstanceOf<String>()23a.shouldNotBeSameInstanceAs(15)24a.shouldBeSameInstanceAs(10)25a.shouldNotBeSameInstanceAs("10")26a.shouldBeInstanceOf<Int>()27a.shouldNotBeInstanceOf<String>()28a.shouldNotBeSameInstanceAs(15)29a.shouldBeSameInstanceAs(10)30a.shouldNotBeSameInstanceAs("10")31a.shouldBeInstanceOf<Int>()32a.shouldNotBeInstanceOf<String>()33a.shouldNotBeSameInstanceAs(15)34a.shouldBeSameInstanceAs(10)35a.shouldNotBeSameInstanceAs("10")36a.shouldBeInstanceOf<Int>()37a.shouldNotBeInstanceOf<String>()38a.shouldNotBeSameInstanceAs(15)39a.shouldBeSameInstanceAs(10)40a.shouldNotBeSameInstanceAs("10")41a.shouldBeInstanceOf<Int>()42a.shouldNotBeInstanceOf<String>()43a.shouldNotBeSameInstanceAs(15)44a.shouldBeSameInstanceAs(10)45a.shouldNotBeSameInstanceAs("

TypeMatchers

Using AI Code Generation

1import io.kotest.matchers.types.*2class MatchersTest {3    fun `should be instance of`() {4        instance.shouldBeInstanceOf<String>()5    }6    fun `should be same instance as`() {7        instance.shouldBeSameInstanceAs(instance)8    }9    fun `should be null`() {10        instance.shouldBeNull()11    }12    fun `should not be null`() {13        instance.shouldNotBeNull()14    }15    fun `should be the same`() {16        instance.shouldBeTheSameInstanceAs(instance)17    }18    fun `should be the same instance as`() {19        instance.shouldBeTheSameInstanceAs(instance)20    }21    fun `should not be the same`() {22        instance.shouldNotBeTheSameInstanceAs(instance2)23    }24    fun `should not be the same instance as`() {25        instance.shouldNotBeTheSameInstanceAs(instance2)26    }27    fun `should be the same type as`() {28        instance.shouldBeTheSameTypeAs(instance)29    }30    fun `should not be the same type as`() {31        instance.shouldNotBeTheSameTypeAs(instance2)32    }33    fun `should be the same class as`() {34        instance.shouldBeTheSameClassAs(instance)35    }36    fun `should not be the same class as`() {37        instance.shouldNotBeTheSameClassAs(instance2)38    }39    fun `should be the same type as other`() {

TypeMatchers

Using AI Code Generation

1package io.kotest.matchers.types import io.kotest.matchers.Matcher import io.kotest.matchers.MatcherResult import io.kotest.matchers.should import io.kotest.matchers.shouldNot fun <T> beInstanceOf() = TypeMatchers.isA<T>() fun <T> beInstanceOf(type: KClass<T>) = TypeMatchers.isA(type) fun <T> beInstanceOf(type: KType) = TypeMatchers.isA(type) fun <T> beInstanceOf(type: Type) = TypeMatchers.isA(type) fun <T> beInstanceOf(type: Class<T>) = TypeMatchers.isA(type) fun <T> beInstanceOf(type: KClass<T>, predicate: (T) -> Boolean) = TypeMatchers.isA(type, predicate) fun <T> beInstanceOf(type: KType, predicate: (T) -> Boolean) = TypeMatchers.isA(type, predicate) fun <T> beInstanceOf(type: Type, predicate: (T) -> Boolean) = TypeMatchers.isA(type, predicate) fun <T> beInstanceOf(type: Class<T>, predicate: (T) -> Boolean) = TypeMatchers.isA(type, predicate) object TypeMatchers { inline fun <reified T> isA() = isA(T::class) fun <T> isA(type: KClass<T>) = object : Matcher<Any> { override fun test(value: Any) = MatcherResult( value is T, "${value::class.simpleName} should be a ${type.simpleName}", "${value::class.simpleName} should not be a ${type.simpleName}" ) } fun <T> isA(type: KType) = object : Matcher<Any> { override fun test(value: Any) = MatcherResult( value is T, "${value::class.simpleName} should be a ${type.simpleName}", "${value::class.simpleName} should not be a ${type.simpleName}" ) } fun <T> isA(type: Type) = object : Matcher<Any> { override fun test(value: Any) = MatcherResult( value is T, "${value::class.simpleName} should be a ${type.simpleName}", "${value::class.simpleName} should not object2val person = Person("John", 25)3val person = Person("John", 25)4val person = Person("John", 25)5val person = Person("John", 25)6val person = Person("John", 25)7val person = Person("John", 25)8val person = Person("John", 25)

TypeMatchers

Using AI Code Generation

1val person = Person("John", "Doe")2person should beOfType<Person>()3val person = Person("John", "Doe")4person should beA<Person>()5val person = Person("John", "Doe")6person should beA<Person>()7val person = Person("John", "Doe")8person should beA<Person>()9val person = Person("John", "Doe")10person should beA<Person>()11val person = Person("John", "Doe")12person should beA<Person>()13val person = Person("John", "Doe")14person should beA<Person>()15val person = Person("John", "Doe")16person should beA<Person>()17val person = Person("John", "Doe")18person should beA<Person>()19val person = Person("John", "Doe")20person should beA<Person>()21val person = Person("John", "Doe")22person should beA<Person>()23val person = Person("John", "Doe")24person should beA<Person>()

TypeMatchers

Using AI Code Generation

1val person = Person("John", 25)2val person = Person("John", 25)3val person = Person("John", 25)4val person = Person("John", 25)5val person = Person("John", 25)6val person = Person("John", 25)7val person = Person("John", 25)8val person = Person("John", 25)9val person = Person("John", 25)10val person = Person("John", 25)

TypeMatchers

Using AI Code Generation

1val person = Person("John", "Doe")2person should beOfType<Person>()3val person = Person("John", "Doe")4person should beA<Person>()5val person = Person("John", "Doe")6person should beA<Person>()7val person = Person("John", "Doe")8person should beA<Person>()9val person = Person("John", "Doe")10person should beA<Person>()11val person = Person("John", "Doe")12person should beA<Person>()13val person = Person("John", "Doe")14person should beA<Person>()15val person = Person("John", "Doe")16person should beA<Person>()17val person = Person("John", "Doe")18person should beA<Person>()19val person = Person("John", "Doe")20person should beA<Person>()21val person = Person("John", "Doe")22person should beA<Person>()23val person = Person("John", "Doe")24person should beA<Person>()

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