I'm trying to run a simple unit test written with Kotest on a spring boot project. But unfortunately I get an error message
Testing started at 17:38 ...
Error: Unable to initialize main class io.kotest.launcher.LauncherKt
Caused by: java.lang.NoClassDefFoundError: io/kotest/core/engine/TestEngineListener
Process finished with exit code 1
My pom.xml file
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>spring-kotest-test</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>consoleApp</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<kotlin.code.style>official</kotlin.code.style>
<kotlin.compiler.jvmTarget>17</kotlin.compiler.jvmTarget>
<kotlin.version>1.7.10</kotlin.version>
</properties>
<repositories>
<repository>
<id>mavenCentral</id>
<url>https://repo1.maven.org/maven2/</url>
</repository>
</repositories>
<build>
<sourceDirectory>src/main/kotlin</sourceDirectory>
<testSourceDirectory>src/test/kotlin</testSourceDirectory>
<plugins>
<plugin>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-plugin</artifactId>
<version>1.7.10</version>
<executions>
<execution>
<id>compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>test-compile</id>
<phase>test-compile</phase>
<goals>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.2</version>
</plugin>
<plugin>
<artifactId>maven-failsafe-plugin</artifactId>
<version>2.22.2</version>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<configuration>
<mainClass>MainKt</mainClass>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>2.7.3</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<version>2.7.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-jdk8</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>io.kotest</groupId>
<artifactId>kotest-runner-junit5</artifactId>
<version>5.4.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.kotest.extensions</groupId>
<artifactId>kotest-extensions-spring</artifactId>
<version>1.1.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.kotest</groupId>
<artifactId>kotest-assertions-core-jvm</artifactId>
<version>5.4.2</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
Simple example of spring boot project
package org.example.spring.kotest.test
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication
import org.springframework.stereotype.Service
@SpringBootApplication
open class SpringKotestTestApplication
@Service
class SomeService {
fun foo() = 1
}
fun main(args: Array<String>) {
runApplication<SpringKotestTestApplication>(*args)
}
My unit test:
package org.example.spring.kotest.test
import io.kotest.core.spec.style.DescribeSpec
import io.kotest.extensions.spring.SpringExtension
import io.kotest.matchers.shouldBe
import org.springframework.boot.autoconfigure.EnableAutoConfiguration
import org.springframework.boot.test.context.SpringBootTest
@SpringBootTest
@EnableAutoConfiguration
class SomeServiceTest(
private val someService: SomeService
) : DescribeSpec() {
override fun extensions() = listOf(SpringExtension)
init {
describe("test") {
it("test") {
someService.foo().shouldBe(1)
}
}
}
}
I've been trying to solve the problem for a very long time. It seems that Kotest works better with Gradle than with Maven :(
