What do I want?
I want to run my tests using kotlintest, and I succeeded in running them from IntelliJ by clicking the icon next to the test class.
I also have JUnit 5 tests in my project.
I am now starting to use the Gradle Kotlin DSL, and I managed to run the Gradle task check
which executed the JUnit 5 tasks.
What is the problem?
The kotlintest test is not run! It is not discovered by Gradle it seems, as a failing test lets the Gradle task succeed. So,
How to run kotlintest tests using the Gradle Kotlin DSL while also using JUnit 5?
What did I try?
How can I run kotlintest tests with gradle? is essentially the old version of the question but already obsolete since using different technology: JUnit 4 and Gradle instead of the Gradle Kotlin DSL. All other question I could find are either for JUnit 4, or JUnit 5 without kotlintest.
Project setup
I am using Gradle 4.6. My test is
import io.kotlintest.matchers.exactly
import io.kotlintest.matchers.shouldBe
import io.kotlintest.specs.FunSpec
class KotlinTest: FunSpec() {
init {
testCalculate()
}
/** This failing test will not fail the Gradle check. */
fun testCalculate() = test("one plus one is two") {
(1+1).toDouble() shouldBe exactly(42.0)
}
}
and my build.gradle.kts
is
import org.gradle.api.plugins.ExtensionAware
import org.junit.platform.gradle.plugin.FiltersExtension
import org.junit.platform.gradle.plugin.EnginesExtension
import org.junit.platform.gradle.plugin.JUnitPlatformExtension
group = "mypackage"
version = "0.0"
// JUnit 5
buildscript {
repositories {
mavenCentral()
jcenter()
}
dependencies {
classpath("org.junit.platform:junit-platform-gradle-plugin:1.1.0")
}
}
apply {
plugin("org.junit.platform.gradle.plugin")
}
// Kotlin configuration.
plugins {
application
kotlin("jvm") version "1.2.30"
java // Required by at least JUnit.
}
application {
mainClassName = "mypackage.HelloWorld"
}
dependencies {
compile(kotlin("stdlib"))
// To "prevent strange errors".
compile(kotlin("reflect"))
// Kotlin reflection.
compile(kotlin("test"))
compile(kotlin("test-junit"))
// JUnit 5
testImplementation("org.junit.jupiter:junit-jupiter-api:5.1.0")
testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.1.0")
testRuntime("org.junit.platform:junit-platform-console:1.1.0")
// Kotlintests are not run anyway when using JUnit 5 as well.
testCompile("io.kotlintest:kotlintest:2.0.7")
}
repositories {
jcenter()
}
PS Complete project at GitHub.
With more recent versions of the Kotlin Gradle plugin, adding this is sufficient:
dependencies {
testImplementation(kotlin("test-junit5"))
testRuntimeOnly("org.junit.jupiter", "junit-jupiter-engine", "5.5.2")
}
tasks {
test {
useJUnitPlatform()
}
}
This is assuming that you want to stick to the interface of kotlin.test
.
For example, a small test could look like this:
import kotlin.test.Test
import kotlin.test.assertEquals
class SomeTest {
@Test
fun testBar() {
assertEquals(5, 6)
}
}
If you want to run your tests from IDEA, you need to add some additional dependencies:
dependencies {
// ...
testCompileOnly("org.junit.jupiter", "junit-jupiter-api", "5.5.2")
testCompileOnly("org.junit.jupiter", "junit-jupiter-params", "5.5.2")
}
Since kotlintest version 3, JUnit 5 is supported! Just replace, in your build.gradle.kts
,
testCompile("io.kotlintest:kotlintest:2.0.7")
by
testCompile("io.kotlintest:kotlintest-core:3.0.2")
testCompile("io.kotlintest:kotlintest-assertions:3.0.2")
testCompile("io.kotlintest:kotlintest-runner-junit5:3.0.2")
as clarified in the changelog.
Then either run the Gradle task check
(in IntelliJ in the Gradle tool window on the right) or, in IntelliJ, click the gutter icon to run only a specific test or set of tests.
Similar to @PhPirate's answer, to use KotlinTest 3.0.x with gradle, you need to.
The first two steps are common for any project that uses junit platform - which includes junit5 itself, KotlinTest, Spek, and so on.
A basic gradle config looks like this:
apply plugin: 'org.junit.platform.gradle.plugin'
buildscript {
ext.kotlin_version = '1.2.31'
repositories {
mavenCentral()
}
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath "org.junit.platform:junit-platform-gradle-plugin:1.1.0"
}
}
dependencies {
testCompile 'io.kotlintest:kotlintest-runner-junit5:3.0.2'
}
You could also clone the gradle sample repo here which has a simple gradle project configured with KotlinTest.
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