JavaExercism/exercises/build.gradle

// This root Gradle project is used for:
//
// - Checking that every test suite compiles against its corresponding reference implementation;
// - Checking that every reference implementation passes its corresponding test suite;
// - Checking that every provided starter implementation compiles.
//
// This file is never delivered to Exercism users.

def generatedTestSourceDir = "build/gen/test/java"

subprojects {

  // Add a task that copies test source files into a build directory. All @Ignore annotations
  // are removed during this copying, so that when we run the copied tests, none are skipped and
  // all should execute.
  //
  // Note that journey-test.sh also strips @Ignore annotations using sed. The
  // stripping implementations here and in journey-test.sh should be kept
  // consistent.
  task copyTestsFilteringIgnores(type: Copy) {
    from "src/test/java"
    into generatedTestSourceDir
    filter { line ->
      line.contains("@Ignore") ? null : line
    }
  }

  afterEvaluate { project ->

    sourceSets {
      // Set the directory containing the reference solution as the default source set. Default
      // compile tasks will now run against this source set.
      main {
        java.srcDirs = [".meta/src/reference/java"]
      }

      // Define a custom source set named "starterSource" that points to the starter implementations
      // delivered to users. We can then use the generated "compileStarterSourceJava" task to verify
      // that the starter source compiles as-is.
      starterSource {
        java.srcDirs = ["src/main/java"]
      }

      // Set the directory containing the @Ignore-stripped tests as the default test source set.
      // Default test tasks will now run against this source set.
      test {
        java.srcDirs = [generatedTestSourceDir]
      }

      // Log the source paths associated with each source set to verify they are what we expect.
      logCompileTaskSourcePath(project, "compileJava") // Corresponds to the "main" source set.
      logCompileTaskSourcePath(project, "compileStarterSourceJava")
      logCompileTaskSourcePath(project, "compileTestJava")
    }

    // When running the standard test task, make sure we prepopulate the test source set with the
    // @Ignore-stripped tests.
    test.dependsOn(copyTestsFilteringIgnores)
  }

}

def logCompileTaskSourcePath(Project project, String taskName) {
  project[taskName].doFirst { compileTask ->
    println "  (source = ${compileTask.source.asPath})"
  }
}