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How to use Exceptions class of io.kotest.assertions package

Best Kotest code snippet using io.kotest.assertions.Exceptions

SuspendRunners.kt

Source:SuspendRunners.kt

1package arrow.fx.coroutines2import io.kotest.assertions.fail3import io.kotest.assertions.throwables.shouldThrow4import io.kotest.matchers.shouldBe5import io.kotest.property.Arb6import io.kotest.property.arbitrary.int7import io.kotest.property.arbitrary.map8import io.kotest.property.checkAll9import kotlin.coroutines.Continuation10import kotlin.coroutines.EmptyCoroutineContext11import kotlin.coroutines.startCoroutine12class SuspendRunners : ArrowFxSpec(13  spec = {14    "should defer evaluation until run" {15      var run = false16      val fa = suspend { run = true }17      run shouldBe false18      Platform.unsafeRunSync(fa)19      run shouldBe true20    }21    "invoke is called on every run call" {22      val sideEffect = SideEffect()23      val fa = suspend { sideEffect.increment(); 1 }24      Platform.unsafeRunSync(fa)25      Platform.unsafeRunSync(fa)26      sideEffect.counter shouldBe 227    }28    "should catch exceptions within main block" {29      checkAll(Arb.throwable()) { e ->30        val task = suspend { throw e }31        shouldThrow<Throwable> {32          Platform.unsafeRunSync { task.invoke() }33        } shouldBe e34      }35    }36    "should yield immediate successful invoke value" {37      checkAll(Arb.int()) { i ->38        val task = suspend { i }39        val run = Platform.unsafeRunSync { task.invoke() }40        run shouldBe i41      }42    }43    "should return a null value from unsafeRunSync" {44      val run = Platform.unsafeRunSync { suspend { null }() }45      run shouldBe null46    }47    "suspend with unsafeRunSync" {48      checkAll(Arb.int().map { suspend { it } }) { i ->49        val map = suspend { i() + 1 }50        Platform.unsafeRunSync(map) shouldBe (i.invoke() + 1)51      }52    }53    "should complete when running a pure value with unsafeRunAsync" {54      checkAll(Arb.int()) { i ->55        val task = suspend { i }56        task.startCoroutine(57          Continuation(EmptyCoroutineContext) { res ->58            res.getOrThrow() shouldBe i59          }60        )61      }62    }63    "should return an error when running an exception with unsafeRunAsync" {64      checkAll(Arb.throwable()) { e ->65        val task = suspend { throw e }66        task.startCoroutine(67          Continuation(EmptyCoroutineContext) { res ->68            res.fold(69              { fail("Expected $e but found with $it") },70              {71                it shouldBe e72              }73            )74          }75        )76      }77    }78    "should rethrow exceptions within run block with unsafeRunAsync" {79      checkAll(Arb.throwable()) { e ->80        val task = suspend { throw e }81        try {82          task.startCoroutine(83            Continuation(EmptyCoroutineContext) { res ->84              res.fold({ fail("Expected $e but found with $it") }, { throw e })85            }86          )87          fail("Should rethrow the exception")88        } catch (t: Throwable) {89          t shouldBe e90        }91      }92    }93    "should complete when running a pure value with startCoroutineCancellable" {94      checkAll(Arb.int()) { i ->95        val task = suspend { i }96        task.startCoroutineCancellable(97          CancellableContinuation(EmptyCoroutineContext) { res ->98            res.getOrThrow() shouldBe i99          }100        )101      }102    }103    "should return exceptions within main block with startCoroutineCancellable" {104      checkAll(Arb.throwable()) { e ->105        val task = suspend { throw e }106        task.startCoroutineCancellable(107          CancellableContinuation(EmptyCoroutineContext) { res ->108            res.fold({ fail("Expected $e but found with $it") }, { it shouldBe e })109          }110        )111      }112    }113    "should rethrow exceptions within run block with startCoroutineCancellable" {114      checkAll(Arb.throwable()) { e ->115        val task = suspend { throw e }116        try {117          task.startCoroutineCancellable(118            CancellableContinuation(EmptyCoroutineContext) { res ->119              res.fold({ fail("Expected $e but found with $it") }, { throw it })120            }121          )122          fail("Should rethrow the exception")123        } catch (t: Throwable) {124          t shouldBe e125        }126      }127    }128    "Effect-full stack-safe map" {129      val max = 10000130      suspend fun addOne(n: Int): Int = n + 1 // Equivalent of `map` for `IO`.131      suspend fun fa(): Int =132        (0 until (max * 10000)).fold(0) { acc, _ -> addOne(acc) }133      Platform.unsafeRunSync { fa() } shouldBe (max * 10000)134    }135  }136)...

SchemaServiceImplTest.kt

Source:SchemaServiceImplTest.kt

1package org.factcast.schema.registry.cli.utils2import com.fasterxml.jackson.databind.JsonNode3import com.github.fge.jsonschema.core.exceptions.ProcessingException4import com.github.fge.jsonschema.main.JsonSchema5import com.github.fge.jsonschema.main.JsonSchemaFactory6import io.kotest.assertions.arrow.core.shouldBeLeft7import io.kotest.assertions.arrow.core.shouldBeRight8import io.kotest.core.spec.style.StringSpec9import io.kotest.core.test.TestCase10import io.kotest.core.test.TestResult11import io.kotest.matchers.shouldBe12import io.kotest.matchers.types.shouldBeInstanceOf13import io.mockk.clearAllMocks14import io.mockk.every15import io.mockk.mockk16import io.mockk.verifyAll17import org.factcast.schema.registry.cli.fs.FileSystemService18import org.factcast.schema.registry.cli.validation.ProjectError19import java.nio.file.Paths20class SchemaServiceImplTest : StringSpec() {21    val fs = mockk<FileSystemService>()22    val jsonSchemaFactory = mockk<JsonSchemaFactory>()23    val schemaMock = mockk<JsonSchema>()24    val jsonNodeMock = mockk<JsonNode>()25    val dummyPath = Paths.get(".")26    val uut = SchemaServiceImpl(fs, jsonSchemaFactory)27    override fun afterTest(testCase: TestCase, result: TestResult) {28        clearAllMocks()29    }30    init {31        "loadSchema for invalid path" {32            every { fs.readToJsonNode(dummyPath) } returns null33            uut.loadSchema(dummyPath).shouldBeLeft().also {34                it.shouldBeInstanceOf<ProjectError.NoSuchFile>()35            }36            verifyAll {37                fs.readToJsonNode(dummyPath)38            }39        }40        "loadSchema for corrupted schema" {41            every { fs.readToJsonNode(dummyPath) } returns jsonNodeMock42            every { jsonSchemaFactory.getJsonSchema(any<JsonNode>()) } throws ProcessingException("")43            uut.loadSchema(dummyPath).shouldBeLeft().also {44                it.shouldBeInstanceOf<ProjectError.CorruptedSchema>()45            }46            verifyAll {47                fs.readToJsonNode(dummyPath)48                jsonSchemaFactory.getJsonSchema(any<JsonNode>())49            }50        }51        "loadSchema for valid schema" {52            every { fs.readToJsonNode(dummyPath) } returns jsonNodeMock53            every { jsonSchemaFactory.getJsonSchema(any<JsonNode>()) } returns schemaMock54            uut.loadSchema(dummyPath).shouldBeRight().also {55                it shouldBe schemaMock56            }57            verifyAll {58                fs.readToJsonNode(dummyPath)59                jsonSchemaFactory.getJsonSchema(any<JsonNode>())60            }61        }62    }63}...

PetWeightTest.kt

Source:PetWeightTest.kt

1package app.civa.vaccination.domain2import io.kotest.assertions.throwables.shouldNotThrowAny3import io.kotest.assertions.throwables.shouldThrowExactly4import io.kotest.core.spec.style.BehaviorSpec5import io.kotest.data.blocking.forAll6import io.kotest.data.row7import io.kotest.matchers.shouldBe8import io.kotest.matchers.throwable.shouldHaveMessage9import io.kotest.matchers.types.shouldBeInstanceOf10class PetWeightTest : BehaviorSpec({11    given("positive numbers or zero as inputs") {12        `when`("PetWeight is instantiated") {13            then("it should not throw any exceptions") {14                forAll(15                    row(0.56),16                    row(2.56),17                    row(5.5),18                    row(8.7123189),19                    row(10.051)20                ) {21                    shouldNotThrowAny {22                        PetWeight from it23                    }24                }25            }26        }27    }28    given("negative numbers or zero as inputs") {29        `when`("PetWeight is instantiated") {30            then("it should throw InvalidPetWeightException") {31                forAll(32                    row(0.0),33                    row(-2.56),34                    row(-9995.5),35                ) {36                    val exception = shouldThrowExactly<InvalidPetWeightException> {37                        PetWeight from it38                    }39                    exception shouldHaveMessage "Pet weight must be positive: 0 (ZERO) or greater"40                    exception.explain() shouldBe "Expected: $it to be bigger than 0.0, Actual: $it"41                }42            }43        }44    }45    given("a value that does not need rounding") {46        `when`("property value is accessed") {47            then("it should return correct information") {48                (PetWeight from 5.78)49                    .shouldBeInstanceOf<PetWeight>()50                    .value shouldBe 5.7851            }52        }53    }54    given("a value that needs rounding") {55        `when`("value is closer to ceil") {56            then("it should round up") {57                (PetWeight from 2.678)58                    .shouldBeInstanceOf<PetWeight>()59                    .value shouldBe 2.6860            }61        }62        `when`("value is closer to floor") {63            then("it should round down") {64                (PetWeight from 2.674)65                    .shouldBeInstanceOf<PetWeight>()66                    .value shouldBe 2.6767            }68        }69    }70})...

build.gradle.kts

Source:build.gradle.kts

...48   // configure kotest to run49   tasks.test {50      useJUnitPlatform()51      testLogging {52         showExceptions = true53         showStandardStreams = true54         exceptionFormat = org.gradle.api.tasks.testing.logging.TestExceptionFormat.FULL55      }56   }57   // set all projects to latest LTS of the JDK and stable kotlin version58   tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {59      kotlinOptions.jvmTarget = "17"60      kotlinOptions.freeCompilerArgs += "-Xopt-in=kotlin.time.ExperimentalTime"61   }62}...

AdminAuthConfigTest.kt

Source:AdminAuthConfigTest.kt

1package com.kuvaszuptime.kuvasz.config2import io.kotest.assertions.exceptionToMessage3import io.kotest.assertions.throwables.shouldThrow4import io.kotest.core.spec.style.BehaviorSpec5import io.kotest.matchers.string.shouldContain6import io.micronaut.context.ApplicationContext7import io.micronaut.context.env.PropertySource8import io.micronaut.context.exceptions.BeanInstantiationException9class AdminAuthConfigTest : BehaviorSpec(10    {11        given("an AdminAuthConfig bean") {12            `when`("password is less than 12 characters long") {13                val properties = PropertySource.of(14                    "test",15                    mapOf(16                        "admin-auth.username" to "test-user",17                        "admin-auth.password" to "tooShortPas"18                    )19                )20                then("ApplicationContext should throw a BeanInstantiationException") {21                    val exception = shouldThrow<BeanInstantiationException> {22                        ApplicationContext.run(properties)23                    }24                    exceptionToMessage(exception) shouldContain "password - size must be between 12"25                }26            }27            `when`("username or password is blank") {28                val properties = PropertySource.of(29                    "test",30                    mapOf(31                        "admin-auth.username" to "",32                        "admin-auth.password" to ""33                    )34                )35                then("ApplicationContext should throw a BeanInstantiationException") {36                    val exception = shouldThrow<BeanInstantiationException> {37                        ApplicationContext.run(properties)38                    }39                    exceptionToMessage(exception) shouldContain "username - must not be blank"40                    exceptionToMessage(exception) shouldContain "password - must not be blank"41                }42            }43        }44    }45)...

AppConfigTest.kt

Source:AppConfigTest.kt

1package com.kuvaszuptime.kuvasz.config2import io.kotest.assertions.exceptionToMessage3import io.kotest.assertions.throwables.shouldThrow4import io.kotest.core.spec.style.BehaviorSpec5import io.kotest.matchers.string.shouldContain6import io.micronaut.context.ApplicationContext7import io.micronaut.context.env.PropertySource8import io.micronaut.context.exceptions.BeanInstantiationException9class AppConfigTest : BehaviorSpec(10    {11        given("an AppConfig bean") {12            `when`("there is a data-retention-days parameter with a null value") {13                val properties = PropertySource.of(14                    "test",15                    mapOf(16                        "app-config.data-retention-days" to "null"17                    )18                )19                then("ApplicationContext should throw a BeanInstantiationException") {20                    val exception = shouldThrow<BeanInstantiationException> {21                        ApplicationContext.run(properties)22                    }23                    exceptionToMessage(exception) shouldContain24                        "Error resolving property value [app-config.data-retention-days]"25                }26            }27            `when`("there is a data-retention-days parameter with an exceptionally low value") {28                val properties = PropertySource.of(29                    "test",30                    mapOf(31                        "app-config.data-retention-days" to "6"32                    )33                )34                then("ApplicationContext should throw a BeanInstantiationException") {35                    val exception = shouldThrow<BeanInstantiationException> {36                        ApplicationContext.run(properties)37                    }38                    exceptionToMessage(exception) shouldContain "dataRetentionDays - must be greater than or equal to 7"39                }40            }41        }42    }43)...

BatchTest.kt

Source:BatchTest.kt

1package app.civa.vaccination.domain2import io.kotest.assertions.throwables.shouldNotThrowAny3import io.kotest.assertions.throwables.shouldThrowExactly4import io.kotest.core.spec.style.BehaviorSpec5import io.kotest.data.blocking.forAll6import io.kotest.data.row7import io.kotest.matchers.shouldBe8import io.kotest.matchers.throwable.shouldHaveMessage9import io.kotest.matchers.types.shouldBeInstanceOf10class BatchTest : BehaviorSpec({11    given("valid inputs") {12        `when`("Batch is instantiated") {13            then("it should not throw any exceptions") {14                forAll(15                        row("000/00"),16                        row("086/21"),17                        row("999/99")18                ) { shouldNotThrowAny { Batch from it } }19            }20        }21    }22    given("invalid inputs") {23        `when`("Batch is instantiated") {24            then("it should throw InvalidBatchException") {25                forAll(26                        row("1231232"),27                        row("99/999"),28                        row("/"),29                        row("1234/12")30                ) {31                    val exception = shouldThrowExactly<InvalidBatchException> {32                        Batch from it33                    }34                    exception shouldHaveMessage "Batch doesn't match required pattern"35                    exception.explain() shouldBe "Expected: ddd/dd, Actual: $it"36                }37            }38        }39    }40    given("a valid Batch instance") {41        `when`("property value is accessed") {42            then("it should return correct information") {43                (Batch from "002/21")44                        .shouldBeInstanceOf<Batch>()45                        .value shouldBe "002/21"46            }47        }48    }49})...

SMTPMailerConfigTest.kt

Source:SMTPMailerConfigTest.kt

1package com.kuvaszuptime.kuvasz.config2import io.kotest.assertions.exceptionToMessage3import io.kotest.assertions.throwables.shouldThrow4import io.kotest.core.spec.style.BehaviorSpec5import io.kotest.matchers.string.shouldContain6import io.micronaut.context.ApplicationContext7import io.micronaut.context.env.PropertySource8import io.micronaut.context.exceptions.BeanInstantiationException9class SMTPMailerConfigTest : BehaviorSpec(10    {11        given("an SMTPMailerConfig bean") {12            `when`("the SMTP host does not exists") {13                val properties = PropertySource.of(14                    "test",15                    mapOf(16                        "handler-config.smtp-event-handler.enabled" to "true",17                        "smtp-config.host" to "localhost",18                        "smtp-config.port" to "123"19                    )20                )21                then("ApplicationContext should throw a BeanInstantiationException") {22                    val exception = shouldThrow<BeanInstantiationException> {23                        ApplicationContext.run(properties)24                    }25                    exceptionToMessage(exception) shouldContain "Error when trying to open connection to the server"26                }27            }28        }29    }30)...

Exceptions

Using AI Code Generation

1val result = try { 1 / 0 } catch (e: ArithmeticException) { e }2val result = try { 1 / 0 } catch (e: ArithmeticException) { e }3val result = try { 1 / 0 } catch (e: ArithmeticException) { e }4val result = try { 1 / 0 } catch (e: ArithmeticException) { e }5val result = try { 1 / 0 } catch (e: ArithmeticException) { e }6val result = try { 1 / 0 } catch (e: ArithmeticException) { e }7val result = try { 1 / 0 } catch (e: ArithmeticException) { e }8val result = try { 1 / 0 } catch (e: ArithmeticException) { e }9val result = try { 1 / 0 } catch (e: ArithmeticException) { e }10val result = try { 1 / 0 } catch (e: ArithmeticException) { e }11val result = try { 1 / 0 } catch (e: ArithmeticException) { e }12val result = try {

Exceptions

Using AI Code Generation

1result shouldBeFailure { it.message shouldBe "some error message" }2result shouldBeFailure { it.message shouldBe "some error message" }3result shouldBeFailure { it.message shouldBe "some error message" }4result shouldBeFailure { it.message shouldBe "some error message" }5result shouldBeFailure { it.message shouldBe "some error message" }6result shouldBeFailure { it.message shouldBe "some error message" }7result shouldBeFailure { it.message shouldBe "some error message" }8result shouldBeFailure { it.message shouldBe "some error message" }9result shouldBeFailure { it.message shouldBe "some error message" }10result shouldBeFailure { it.message shouldBe "some error message" }11result shouldBeFailure { it.message shouldBe "some error message" }12result shouldBeFailure { it.message shouldBe "some error message" }

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