abstract class IncrementalTestJvmComponent extends TestJvmComponent {

    abstract void changeSources(List<TestFile> testFiles)

    abstract void writeAdditionalSources(TestFile testFile)

    abstract TestFile createIgnoredFileInSources(TestFile sourceDir)

    List<JvmSourceFile> expectedOutputs = [
            sources[0].classFile,
            sources[1].classFile,
            resources[0],
            resources[1]
    ]

    @Override
    TestFile createIgnoredFileInSources(TestFile sourceDir) {
        sourceDir.createFile("java/SomeIgnoredFile.groovy~") << '// this file should be ignored'
    }

    List<JvmSourceFile> expectedOutputs = [
            sources[0].classFile,
            sources[1].classFile,
            resources[0],
            resources[1]
    ]

    @Override
    TestFile createIgnoredFileInSources(TestFile sourceDir) {
        sourceDir.createFile("java/SomeIgnoredFile.java~") << '// this file should be ignored'
    }

        testFile.file("scala/Extra.scala") << """
object Extra {
  def someMethod(args: Array[String]) {
  }
}
"""

    }

    @Override
    TestFile createIgnoredFileInSources(TestFile sourceDir) {
        sourceDir.createFile("scala/SomeIgnoredFile.scala~") << '// this file should be ignored'
    }