Testing with TestNG - Gradle does not execute tests from within additional source set

Hello guys.
So far I am in the process of learning Gradle. Now I encountered a weird behavior while using TestNG with additional source set (for integration tests).
Gradle version is 2.14.1 and here is my build.gradle:

apply plugin: 'eclipse'
apply plugin: 'java'
repositories {
    jcenter()
}
sourceSets {
	test {
		java.srcDirs = ['src/test/unit/java']
		resources.srcDirs = ['src/test/unit/resources']
	}
	
	integration {
		java.srcDirs = ['src/test/integration/java']
		resources.srcDirs = ['src/test/integration/resources']
		
		compileClasspath += main.output
		runtimeClasspath += main.output
	}
}
configurations {
	integrationCompile.extendsFrom testCompile
	integrationRuntime.extendsFrom testRuntime
}
dependencies {
	testCompile(
		'org.testng:testng:6.9.10'
		//'junit:junit:4.12'
	)
}
test {
	useTestNG()
	//useJUnit()
	
	testLogging.showStandardStreams = true
}
task integrationTest(type: Test, description: 'Runs the integration tests.', group: 'Verification') {
	testClassesDir = sourceSets.integration.output.classesDir
	classpath = sourceSets.integration.runtimeClasspath
}
eclipse {
	classpath {
		downloadJavadoc = true
		downloadSources = true
	}
	
	project {
		natures 'org.eclipse.buildship.core.gradleprojectnature'
	}
}
task refreshEclipse(dependsOn: [ 'eclipse', 'cleanEclipse' ], description: 'Refresh all Eclipse files.')

When using TestNG and executing integrationTest task:

  • all tests from src/test/unit/java are executed.
  • no tests from src/test/integration/java are executed.

When using JUnit and executing integrationTest task:

  • all tests from src/test/unit/java are executed.
  • all tests from src/test/integration/java are executed.

Is there anything wrong with my script? Or why does Gradle skip additional source set?

Log shows nothing:

gradlew iT --info
Starting Build
Settings evaluated using settings file 'C:\fenix\workspace\GradleTest\settings.gradle'.
Projects loaded. Root project using build file 'C:\fenix\workspace\GradleTest\build.gradle'.
Included projects: [root project 'GradleTest']
Evaluating root project 'GradleTest' using build file 'C:\fenix\workspace\GradleTest\build.gradle'.
All projects evaluated.                    
Selected primary task 'integrationTest' from project :
Tasks to be executed: [task ':compileJava', task ':processResources', task ':classes', task ':compileTestJava', task ':processTestResources', task ':testClasses', task ':compileIntegrationJava', task ':processIntegrationResources', task ':integrationClasses', task ':in
tegrationTest']
:compileJava (Thread[main,5,main]) started.
:compileJava
Skipping task ':compileJava' as it has no source files.
:compileJava UP-TO-DATE
:compileJava (Thread[main,5,main]) completed. Took 0.019 secs.
:processResources (Thread[main,5,main]) started.
:processResources
file or directory 'C:\fenix\workspace\GradleTest\src\main\resources', not found
Skipping task ':processResources' as it has no source files.
:processResources UP-TO-DATE
:processResources (Thread[main,5,main]) completed. Took 0.001 secs.
:classes (Thread[main,5,main]) started.
:classes
Skipping task ':classes' as it has no actions.
:classes UP-TO-DATE
:classes (Thread[main,5,main]) completed. Took 0.0 secs.
:compileTestJava (Thread[main,5,main]) started.
:compileTestJava                                                                  
Executing task ':compileTestJava' (up-to-date check took 0.333 secs) due to:
  Value of input property 'targetCompatibility' has changed for task ':compileTestJava'
  Value of input property 'sourceCompatibility' has changed for task ':compileTestJava'
All input files are considered out-of-date for incremental task ':compileTestJava'.
Compiling with JDK Java compiler API.
:compileTestJava (Thread[main,5,main]) completed. Took 0.639 secs.
:processTestResources (Thread[main,5,main]) started.
:processTestResources
file or directory 'C:\fenix\workspace\GradleTest\src\test\unit\resources', not found
Skipping task ':processTestResources' as it has no source files.
:processTestResources UP-TO-DATE
:processTestResources (Thread[main,5,main]) completed. Took 0.002 secs.
:testClasses (Thread[main,5,main]) started.
:testClasses
Skipping task ':testClasses' as it has no actions.
:testClasses (Thread[main,5,main]) completed. Took 0.0 secs.
:compileIntegrationJava (Thread[main,5,main]) started.
:compileIntegrationJava
Executing task ':compileIntegrationJava' (up-to-date check took 0.014 secs) due to:
  Value of input property 'targetCompatibility' has changed for task ':compileIntegrationJava'
  Value of input property 'sourceCompatibility' has changed for task ':compileIntegrationJava'
All input files are considered out-of-date for incremental task ':compileIntegrationJava'.
Compiling with JDK Java compiler API.
:compileIntegrationJava (Thread[main,5,main]) completed. Took 0.09 secs.
:processIntegrationResources (Thread[main,5,main]) started.
:processIntegrationResources
file or directory 'C:\fenix\workspace\GradleTest\src\test\integration\resources', not found
Skipping task ':processIntegrationResources' as it has no source files.
:processIntegrationResources UP-TO-DATE
:processIntegrationResources (Thread[main,5,main]) completed. Took 0.001 secs.
:integrationClasses (Thread[main,5,main]) started.
:integrationClasses
Skipping task ':integrationClasses' as it has no actions.
:integrationClasses (Thread[main,5,main]) completed. Took 0.0 secs.
:integrationTest (Thread[main,5,main]) started.
:integrationTest
Executing task ':integrationTest' (up-to-date check took 0.029 secs) due to:
  Value of input property 'executable' has changed for task ':integrationTest'
Finished generating test XML results (0.003 secs) into: C:\fenix\workspace\GradleTest\build\test-results
Generating HTML test report...
Finished generating test html results (0.022 secs) into: C:\fenix\workspace\GradleTest\build\reports\tests
:integrationTest (Thread[main,5,main]) completed. Took 0.15 secs.
BUILD SUCCESSFUL
Total time: 4.708 secs

Thank you for your help.
Franta

UP…
PS: It does not work with Gradle 3.0 either.