Updates, added to test runtimeClasspath in a sourceSet, is not visible during gradle test run

[vryzhuk]

Additional test runtime classpath becomes not visible during test execution when plugin test-sets applied. Test fails with NoClassDefFoundError.

How to reproduce:

1. Create two source sets in build.gradle:

   sourceSets {
   testData {
   java {
     srcDir 'src/testData/java'
     compileClasspath += sourceSets.main.runtimeClasspath
   }
   }
   test {
   java {
     compileClasspath += sourceSets.testData.output
     runtimeClasspath += sourceSets.testData.output
   }
   }
   }

2. Create some class in testData and create Test, which has reference to it.

3. Run gradle build - SUCCESS

4. Add test-sets plugin

   plugins {
   id 'org.unbroken-dome.test-sets'
   }

5. Run gradle build - crashed during test execution phase with "> initializationError FAILED java.lang.NoClassDefFoundError: < class from testData >"

More investigations:

1. Print test.runtimeClasspath in test.doFirst: build/classes/java/testData exist there
2. Print files from test class in Classloader: testData classes do not exist there

Workaround: specify dependency to testData in dependencies section:

dependencies {
    testCompile sourceSets.testData.output
}

[tkrullmann]

Can't really reproduce this... the plugin won't do anything unless you specify test sets in the build script.