A Robolectric test runner for library projects compatible with Android Gradle plugin 2.2.0-alpha6 and later

LibraryProjectTestRunner.java

import org.junit.runners.model.InitializationError;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.annotation.Config;
import org.robolectric.internal.bytecode.InstrumentationConfiguration;
import org.robolectric.manifest.AndroidManifest;
import org.robolectric.res.FileFsFile;
import org.robolectric.res.FsFile;

public class LibraryProjectTestRunner extends RobolectricTestRunner {

	public LibraryProjectTestRunner(Class<?> klass) throws InitializationError {
		super(klass);
	}

	@Override
	protected AndroidManifest getAppManifest(Config config) {
		AndroidManifest appManifest = super.getAppManifest(config);
		FsFile androidManifestFile = appManifest.getAndroidManifestFile();

		if (androidManifestFile.exists()) {
			return appManifest;
		} else {
			androidManifestFile = FileFsFile.from(getModuleRootPath(config), appManifest.getAndroidManifestFile().getPath().replace("manifests" + File.separator + "full", "manifests" + File.separator + "aapt"));
			return new AndroidManifest(androidManifestFile, appManifest.getResDirectory(), appManifest.getAssetsDirectory());
		}
	}

	private String getModuleRootPath(Config config) {
		String moduleRoot = config.constants().getResource("").toString().replace("file:", "");
		return moduleRoot.substring(0, moduleRoot.indexOf("/build"));
	}

}