How to add a dependency to Gradle TestKit when using jvm test suite plugin

Help/Discuss
1

Hi there. I’m writing my first Gradle plugin and trying now to create some functional tests for it.
I’m using jvm-test-suite plugin and I’ve been trying for the last hours to add the dependency to the gradle-testkit without success. I should be missing something really obvious…

The relevant parts of the build.gradle file are like this:

plugins {
    id 'groovy'
    id 'java-gradle-plugin'
    id 'maven-publish'
}

gradlePlugin {
    plugins {
        cmakePlugin {
            id = 'io.myplugin.gradle.cmake-plugin'
            implementationClass = 'io.myplugin.gradle.cmake.CMakePlugin'
        }
    }
}
...
dependencies {
    implementation 'org.apache.groovy:groovy:4.0.6'
    testImplementation gradleTestKit() // according to the  TestKit documentation
}
...
testing {
    suites {
        integrationTest(JvmTestSuite) {
            useJUnitJupiter('5.9.0')
            dependencies {
                implementation project
            }
        }
        functionalTest(JvmTestSuite) {
            useJUnitJupiter('5.9.0')
            dependencies {
                implementation project
                implementation 'commons-io:commons-io:2.11.0'
            }
        }
    }
}

The integration tests run without issues but when trying to run the functional tests, I get this error:

unable to resolve class org.gradle.testkit.runner.GradleRunner
 @ line 14, column 1.
   import org.gradle.testkit.runner.GradleRunner
   ^

I’ve been reading again and again the documentation of the jvm test suite plugin [1] as well as the one for testkit [2] but haven’t been able to make it work. On the IDE (IntelliJ), the autocompletion for testKit works and I see the jar (gradle-test-kit-7.3.1.jar) on the list of ‘External Libraries’. The test, however, seems to be unable to load this jar. I tried to put the dependency under functionalTest.dependencies, i.e., below ‘commons.io’, so like:

...
 functionalTest(JvmTestSuite) {
            useJUnitJupiter('5.9.0')
            dependencies {
                implementation project
                implementation 'commons-io:commons-io:2.11.0'
                implementation gradleTestKit
            }

but the gradle file became invalid complaining that ‘gradleTestKit’ it’s an unknown property. Same if I added using ’ implementation gradleTestKit()’

Could someone please point out what I’m missing? Thanks!

[1] The JVM Test Suite Plugin
[2] Testing Build Logic with TestKit

2

Try with implementation project.dependencies.gradleTestKit(), that should work I think.

5

That fixed the issue, thanks a lot!