To use the TestKit, include the following in your plugin's build:

.Declaring the TestKit dependency
====
include::sample[dir="snippets/testKit/junitQuickstart/kotlin",files="build.gradle.kts[tags=declare-gradle-testkit-dependency]"]
include::sample[dir="snippets/testKit/junitQuickstart/groovy",files="build.gradle[tags=declare-gradle-testkit-dependency]"]
====

import org.gradle.testkit.runner.GradleRunner
import org.gradle.util.internal.TextUtil
import spock.lang.Issue
import spock.lang.TempDir

@Requires(UnitTestPreconditions.NotWindows)
class ConfigurationCacheTestKitIntegrationTest extends AbstractConfigurationCacheIntegrationTest {

    @TempDir
    File jacocoDestinationDir

import org.gradle.test.fixtures.file.TestFile
import org.gradle.testkit.runner.fixtures.CustomDaemonDirectory
import org.gradle.testkit.runner.fixtures.CustomEnvironmentVariables
import org.gradle.testkit.runner.fixtures.Debug
import org.gradle.testkit.runner.fixtures.HideEnvVariableValuesInDaemonLog
import org.gradle.testkit.runner.fixtures.InjectsPluginClasspath
import org.gradle.testkit.runner.fixtures.InspectsBuildOutput

We transform the jar and cache transformed jars for future use.

We transform plugins classpath, TestKit classpath and buildscript classes separately. 

 * limitations under the License.
 */

package gradlebuild.binarycompatibility

import org.gradle.kotlin.dsl.*
import org.gradle.testkit.runner.BuildResult
import org.gradle.testkit.runner.GradleRunner
import org.gradle.testkit.runner.UnexpectedBuildFailure
import org.hamcrest.CoreMatchers
import org.hamcrest.MatcherAssert.assertThat
import org.junit.Assert.assertFalse
import org.junit.Assert.assertTrue

        file("src/functionalTest/groovy/TestkitTestPluginFunctionalTest.groovy") << """
            import spock.lang.Specification
            import spock.lang.TempDir
            import org.gradle.testkit.runner.GradleRunner
            import org.gradle.testkit.runner.TaskOutcome

            class TestkitTestPluginFunctionalTest extends Specification {
                @TempDir
                private File projectDir

import org.gradle.internal.featurelifecycle.LoggingDeprecatedFeatureHandler
import org.gradle.test.fixtures.dsl.GradleDsl
import org.gradle.test.fixtures.file.TestFile
import org.gradle.testkit.runner.GradleRunner
import org.gradle.testkit.runner.internal.DefaultGradleRunner
import org.gradle.util.internal.TextUtil
import spock.lang.Specification
import spock.lang.TempDir

import org.gradle.test.fixtures.file.TestFile
import org.gradle.test.precondition.Requires
import org.gradle.test.preconditions.IntegTestPreconditions
import org.gradle.testkit.runner.BuildResult
import org.gradle.testkit.runner.TaskOutcome
import org.gradle.util.GradleVersion
import org.gradle.util.internal.VersionNumber

import java.nio.charset.StandardCharsets
import java.util.concurrent.ConcurrentHashMap

It has the following features:

* Uses the “`java-gradle-plugin`” plugin to produce a Gradle plugin implemented in Java
* Uses the “`mavenCentral`” dependency repository
* Uses https://junit.org/junit4/[JUnit 4] and TestKit for testing
* Has directories in the conventional locations for source code
* Contains a sample class and unit test, if there are no existing source or test files


[[sec:kotlin_application]]

/**
 * A plugin for building java gradle plugins. Automatically generates plugin descriptors. Emits warnings for common error conditions. <p> Provides a direct integration with TestKit by declaring the
 * {@code gradleTestKit()} dependency for the test compile configuration and a dependency on the plugin classpath manifest generation task for the test runtime configuration. Default conventions can