How to use onShouldNotThrowMatcher method of com.sksamuel.kotest.throwablehandling.CovariantThrowableHandlingTest class

Best Kotest code snippet using com.sksamuel.kotest.throwablehandling.CovariantThrowableHandlingTest.onShouldNotThrowMatcher

CovariantThrowableHandlingTest.kt

Source:CovariantThrowableHandlingTest.kt Github

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...92 "Should not throw" - {93 "Should throw an assertion error wrapping the thrown exception" - {94 "When it's an instance of the right class" {95 val thrownException = FooRuntimeException()96 onShouldNotThrowMatcher<FooRuntimeException> { shouldNotThrowMatcher ->97 verifyThrowsAssertionWrapping(thrownException) {98 shouldNotThrowMatcher { throw thrownException }99 }100 }101 }102 "When it's a subclass of the right class" {103 val thrownException = SubException()104 onShouldNotThrowMatcher<ParentException> { shouldNotThrowMatcher ->105 verifyThrowsAssertionWrapping(thrownException) {106 shouldNotThrowMatcher { throw thrownException }107 }108 }109 }110 }111 "Should throw the thrown exception" - {112 "When it's not an instance nor subclass of the right class" {113 val thrownException = FooRuntimeException()114 onShouldNotThrowMatcher<ParentException> { shouldNotThrowMatcher ->115 verifyThrowsExactly(thrownException) {116 shouldNotThrowMatcher { throw thrownException }117 }118 }119 }120 "When it's an instance of the parent class of the right class" {121 val thrownException = ParentException()122 onShouldNotThrowMatcher<SubException> { shouldNotThrowMatcher ->123 verifyThrowsExactly(thrownException) {124 shouldNotThrowMatcher { throw thrownException }125 }126 }127 }128 }129 "Should not throw an exception" - {130 "When no exception is thrown" {131 onShouldNotThrowMatcher<ParentException> { shouldNotThrowMatcher ->132 val thrown = catchThrowable {133 shouldNotThrowMatcher { /* Nothing thrown */ }134 }135 thrown shouldBe null136 }137 }138 }139 }140 "should throw with message" - {141 "When the correct exception is thrown, but the message is wrong" {142 onShouldThrowWithMessageMatcher<Exception>("foo") { shouldThrowMatcher ->143 verifyThrowsWrongExceptionMessage("foo", "bar") {144 shouldThrowMatcher { throw Exception("bar") }145 }146 }147 }148 "Exception class type should have priority in assertion" {149 val instanceToThrow = Exception("foo")150 runCatching {151 shouldThrowWithMessage<RuntimeException>("bar") {152 throw instanceToThrow153 }154 }155 .exceptionOrNull() shouldBe AssertionError("Expected exception java.lang.RuntimeException but a Exception was thrown instead.")156 }157 }158 }159 private fun <T> onShouldThrowWithMessageMatcher(message: String, func: (ShouldThrowMatcher<T>) -> Unit) {160 func { shouldThrowUnitWithMessage(message, it) }161 func { shouldThrowWithMessage(message, it) }162 }163 private inline fun <reified T : Throwable> onShouldThrowMatcher(func: (ShouldThrowMatcher<T>) -> Unit) {164 func(::shouldThrowUnit)165 func { shouldThrow(it) }166 }167 private fun verifyNoExceptionThrownError(expectedClass: KClass<*>, block: () -> Unit) {168 val throwable = catchThrowable(block)169 throwable.shouldBeInstanceOf<AssertionError>()170 throwable.message shouldBe "Expected exception ${expectedClass.qualifiedName} but no exception was thrown."171 }172 private fun verifyThrowsAssertionErrorInstance(assertionErrorInstance: AssertionError, block: () -> Unit) {173 val throwable = catchThrowable(block)174 (throwable === assertionErrorInstance).shouldBeTrue()175 }176 private fun verifyThrowsWrongExceptionClass(177 thrownInstance: Throwable,178 expectedClass: KClass<*>,179 incorrectClass: KClass<*>,180 block: () -> Unit181 ) {182 val throwable = catchThrowable(block)183 throwable.shouldBeInstanceOf<AssertionError>()184 throwable.message shouldBe "Expected exception ${expectedClass.qualifiedName} but a ${incorrectClass.simpleName} was thrown instead."185 (throwable.cause === thrownInstance).shouldBeTrue()186 }187 private fun verifyThrowsWrongExceptionMessage(188 expectedMessage: String,189 actualMessage: String,190 block: () -> Unit191 ) {192 val throwable = catchThrowable(block)193 throwable.shouldBeInstanceOf<AssertionError>()194 throwable.message shouldBe "Expected exception message $expectedMessage but was $actualMessage instead."195 }196 private fun verifyReturnsExactly(thrownException: Throwable, block: () -> Any?) {197 val actualReturn = block()198 (thrownException === actualReturn).shouldBeTrue()199 }200 private inline fun <reified T : Throwable> onShouldNotThrowMatcher(func: (ShouldNotThrowMatcher<T>) -> Unit) {201 func { shouldNotThrowUnit<T> { it() } }202 func { shouldNotThrow<T>(it) }203 }204 private fun verifyThrowsAssertionWrapping(exception: Throwable, block: () -> Unit) {205 val thrown = catchThrowable(block)206 thrown.shouldBeInstanceOf<AssertionError>()207 thrown.message shouldBe "No exception expected, but a ${exception::class.simpleName} was thrown."208 thrown.cause shouldBeSameInstanceAs exception209 }210 private fun verifyThrowsExactly(exception: Throwable, block: () -> Unit) {211 val thrown = catchThrowable(block)212 thrown shouldBeSameInstanceAs exception213 }214}...

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onShouldNotThrowMatcher

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1import io.kotest.assertions.throwable.shouldThrow2import io.kotest.core.spec.style.FunSpec3import io.kotest.matchers.throwable.shouldHaveMessage4class CovariantThrowableHandlingTest : FunSpec({5 test("shouldThrow should use covariant matching") {6 shouldThrow<IllegalArgumentException> {7 throw IllegalArgumentException("Hello")8 }.shouldHaveMessage("Hello")9 }10})11import io.kotest.assertions.throwable.shouldNotThrow12import io.kotest.core.spec.style.FunSpec13class CovariantThrowableHandlingTest : FunSpec({14 test("shouldNotThrow should use covariant matching") {15 shouldNotThrow<IllegalArgumentException> {16 throw IllegalArgumentException("Hello")17 }18 }19})20import io.kotest.assertions.throwable.shouldHaveCause21import io.kotest.core.spec.style.FunSpec22import io.kotest.matchers.throwable.shouldHaveMessage23class CovariantThrowableHandlingTest : FunSpec({24 test("shouldHaveCause should use covariant matching") {25 shouldThrow<IllegalArgumentException> {26 throw IllegalArgumentException("Hello", IllegalStateException("World"))27 }.shouldHaveCause<IllegalStateException>().shouldHaveMessage("World")28 }29})30import io.kotest.assertions.throwable.shouldHaveMessage31import io.kotest.core.spec.style.FunSpec32class CovariantThrowableHandlingTest : FunSpec({33 test("shouldHaveMessage should use covariant matching") {34 shouldThrow<IllegalArgumentException> {35 throw IllegalArgumentException("Hello")36 }.shouldHaveMessage("Hello")37 }38})39import io.kotest.assert

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onShouldNotThrowMatcher

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1import io.kotest.assertions.throwables.shouldNotThrow2import io.kotest.core.spec.style.FunSpec3import io.kotest.matchers.shouldBe4class CovariantThrowableHandlingTest : FunSpec({5 test("shouldNotThrow should not throw when using a covariant type") {6 shouldNotThrow<Throwable> {7 throw RuntimeException()8 }9 }10})11import io.kotest.assertions.throwables.shouldNotThrow12import io.kotest.core.spec.style.FunSpec13import io.kotest.matchers.shouldBe14class CovariantThrowableHandlingTest : FunSpec({15 test("shouldNotThrow should not throw when using a covariant type") {16 shouldNotThrow<Throwable> {17 throw RuntimeException()18 }19 }20})21import io.kotest.assertions.throwables.shouldNotThrow22import io.kotest.core.spec.style.FunSpec23import io.kotest.matchers.shouldBe24class CovariantThrowableHandlingTest : FunSpec({25 test("shouldNotThrow should not throw when using a covariant type") {26 shouldNotThrow<Throwable> {27 throw RuntimeException()28 }29 }30})31import io.kotest.assertions.throwables.shouldNotThrow32import io.kotest.core.spec.style.FunSpec33import io.kotest.matchers.shouldBe34class CovariantThrowableHandlingTest : FunSpec({35 test("shouldNotThrow should not throw when using a covariant type") {36 shouldNotThrow<Throwable> {37 throw RuntimeException()38 }39 }40})

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