[Live Now] Join the 1-day Testing & QA Summit featuring 15+ Expert Speakers.Join for FREE! Join TestMu Conference

How to use instanceOf method of io.kotest.matchers.types.TypeMatchers class

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

TypeMatchersTest.kt

Source:TypeMatchersTest.kt

...10import io.kotest.matchers.should11import io.kotest.matchers.shouldBe12import io.kotest.matchers.shouldNot13import io.kotest.matchers.types.haveAnnotation14import io.kotest.matchers.types.instanceOf15import io.kotest.matchers.types.shouldBeInstanceOf16import io.kotest.matchers.types.shouldBeSameInstanceAs17import io.kotest.matchers.types.shouldBeTypeOf18import io.kotest.matchers.types.shouldHaveAnnotation19import io.kotest.matchers.types.shouldNotBeInstanceOf20import 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       }...

instanceOf

Using AI Code Generation

1    import io.kotest.matchers.types.shouldBeInstanceOf2    import io.kotest.matchers.types.shouldBeTypeOf3    import io.kotest.matchers.types.shouldNotBeInstanceOf4    import io.kotest.matchers.types.shouldNotBeTypeOf5    import io.kotest.matchers.nulls.shouldBeNull6    import io.kotest.matchers.nulls.shouldNotBeNull7    import io.kotest.matchers.collections.shouldHaveSize8    import io.kotest.matchers.collections.shouldContain9    import io.kotest.matchers.collections.shouldContainAll10    import io.kotest.matchers.collections.shouldContainAllInAnyOrder11    import io.kotest.matchers.collections.shouldContainExactly12    import io.kotest.matchers.collections.shouldContainExactlyInAnyOrder13    import io.kotest.matchers.collections.shouldContainInOrder14    import io.kotest.matchers.collections.shouldContainNone15    import io.kot

instanceOf

Using AI Code Generation

1    instanceOf<Person>(Person::class)2    beInstanceOf<Person>(Person::class)3    shouldBeInstanceOf<Person>(Person::class)4    shouldBeTypeOf<Person>(Person::class)5    shouldBeTheSameInstanceAs(Person::class)6    shouldNotBeTheSameInstanceAs(Person::class)7    shouldBeSameInstanceAs(Person::class)8    shouldNotBeSameInstanceAs(Person::class)9    shouldNotBeInstanceOf<Person>(Person::class)10    shouldNotBeTypeOf<Person>(Person::class)11    shouldBeTheSameInstanceAs(Person::class)12    shouldNotBeTheSameInstanceAs(Person::class)13    shouldBeSameInstanceAs(Person::class)14    shouldNotBeSameInstanceAs(Person::class)15    shouldBeTheSameInstanceAs(Person::class)

instanceOf

Using AI Code Generation

1    import io.kotest.matchers.types.instanceOf2    result should instanceOf<SomeType>()3    import io.kotest.matchers.types.isInstanceOf4    result should isInstanceOf<SomeType>()5    import io.kotest.matchers.types.isNotInstanceOf6    result should isNotInstanceOf<SomeType>()7    import io.kotest.matchers.types.isNull8    result should isNull()9    import io.kotest.matchers.types.isNotNull10    result should isNotNull()11    import io.kotest.matchers.types.isSameInstanceAs12    result should isSameInstanceAs(SomeType())13    import io.kotest.matchers.types.isNotSameInstanceAs14    result should isNotSameInstanceAs(SomeType())15    import io.kotest.matchers.types.isSubtypeOf16    result should isSubtypeOf<SomeType>()17    import io.kotest.matchers.types.isNotSubtypeOf18    result should isNotSubtypeOf<SomeType>()19    import io.kotest.matchers.types.isSupertypeOf20    result should isSupertypeOf<SomeType>()21    import io.kotest.matchers.types.isNotSupertypeOf22    result should isNotSupertypeOf<SomeType>()

instanceOf

Using AI Code Generation

1+import io.kotest.matchers.types.instanceOf2 import org.junit.jupiter.api.Test3 import org.junit.jupiter.api.assertThrows4 import org.junit.jupiter.api.function.Executable5@@ -41,7 +43,7 @@ import kotlin.test.assertEquals6 class TestAssertions {7     fun `test assert`() {8-        assertThrows(AssertionError::class.java) {9+        assertThrows<AssertionError> {10             assert(false)11         }12     }13@@ -49,7 +51,7 @@ class TestAssertions {14     }15-    fun `test assert with message`() {16+    fun `test assert with message`() = assertThrows<AssertionError> {17         assert(false) { "this is a message" }18     }19@@ -57,7 +59,7 @@ class TestAssertions {20     }21-    fun `test assert with lazy message`() {22+    fun `test assert with lazy message`() = assertThrows<AssertionError> {23         assert(false) { "this is a ${"message"}" }24     }25@@ -65,7 +67,7 @@ class TestAssertions {26     }27-    fun `test assertTrue`() {28+    fun `test assertTrue`() = assertThrows<AssertionError> {29         assertTrue(false)30     }31@@ -73,7 +75,7 @@ class TestAssertions {32     }33-    fun `test assertTrue with message`() {34+    fun `test assertTrue with message`() = assertThrows<AssertionError> {35         assertTrue(false) { "this is a message" }36     }37@@ -81,7 +83,7 @@ class TestAssertions {38     }39-    fun `test assertTrue with lazy message`() {40+    fun `test assertTrue with lazy message`() = assertThrows<AssertionError> {41         assertTrue(false) { "this is a ${"message"}" }42     }43@@ -89,7 +91,7 @@ class TestAssertions {44     }45-    fun `test assertFalse`() {46+    fun `test assertFalse`() = assertThrows<AssertionError> {47         assertFalse(true)48     }49@@ -97,7 +99,7 @@ class TestAssertions {50     }51-    fun `test assertFalse with message`() {

instanceOf

Using AI Code Generation

1import io.kotest.matchers.types.shouldBeInstanceOf2obj.shouldBeInstanceOf<String>()3import io.kotest.matchers.types.shouldBeTypeOf4obj.shouldBeTypeOf<String>()5import io.kotest.matchers.types.shouldBeTypeOf6obj.shouldBeTypeOf<String>()7import io.kotest.matchers.types.shouldBeTypeOf8obj.shouldBeTypeOf<String>()9import io.kotest.matchers.types.shouldBeTypeOf10obj.shouldBeTypeOf<String>()11import io.kotest.matchers.types.shouldBeTypeOf12obj.shouldBeTypeOf<String>()13import io.kotest.matchers.types.shouldBeTypeOf14obj.shouldBeTypeOf<String>()15import io.kotest.matchers.types.shouldBeTypeOf16obj.shouldBeTypeOf<String>()17import io.kotest.matchers.types.shouldBeTypeOf

instanceOf

Using AI Code Generation

1        val result = listOf("a", "b", "c").first()2    }3}4fun <T> T.shouldBeTypeOf(type: KClass<T>): T5import io.kotest.core.spec.style.FunSpec6import io.kotest.matchers.types.shouldBeTypeOf7import kotlin.reflect.KClass8class TypeMatchersUnitTest : FunSpec({9    test("String should be an instance of String") {10        val result = listOf("a", "b", "c").first()11    }12})13fun <T> T.shouldNotBeTypeOf(type: KClass<T>): T

instanceOf

Using AI Code Generation

1+a should beInstanceOf<String>()2+b shouldNot beInstanceOf<String>()3+shouldThrow<ArithmeticException> {4+}5+val a = listOf(1, 2, 3)6+val a = mapOf(1 to "One", 2 to "Two")

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.