### Question:
GitProctorCore implements FileBasedPersisterCore { @Nullable @VisibleForTesting static String parseTestName(final String testDefinitionsDirectory, final String filePath) { final String prefix = (Strings.isNullOrEmpty(testDefinitionsDirectory) ? "" : testDefinitionsDirectory + File.separator); if (filePath != null && filePath.startsWith(prefix)) { final String[] directories = filePath.substring(prefix.length()).split(File.separator); return directories.length > 1 ? directories[0] : null; } else { return null; } } GitProctorCore(final String gitUrl,
                          final String username,
                          final String password,
                          final String testDefinitionsDirectory,
                          final File tempDir);  GitProctorCore(final String gitUrl,
                          final String username,
                          final String password,
                          final String testDefinitionsDirectory,
                          final File tempDir,
                          final String branchName);  GitProctorCore(final String gitUrl,
                          final String username,
                          final String password,
                          final String testDefinitionsDirectory,
                          final GitWorkspaceProvider workspaceProvider);  GitProctorCore(final String gitUrl,
                          final String username,
                          final String password,
                          final String testDefinitionsDirectory,
                          final GitWorkspaceProvider workspaceProvider,
                          final int pullPushTimeoutSeconds,
                          final int cloneTimeoutSeconds);  GitProctorCore(final String gitUrl,
                          final String username,
                          final String password,
                          final String testDefinitionsDirectory,
                          final GitWorkspaceProvider workspaceProvider,
                          final int pullPushTimeoutSeconds,
                          final int cloneTimeoutSeconds,
                          final boolean cleanInitialization);  GitProctorCore(final String gitUrl,
                          final String username,
                          final String password,
                          final String testDefinitionsDirectory,
                          final GitWorkspaceProvider workspaceProvider,
                          final int pullPushTimeoutSeconds,
                          final int cloneTimeoutSeconds,
                          final boolean cleanInitialization,
                          @Nullable final String branchName); @Override @Nullable C getFileContents(
            final Class<C> c,
            final String[] path,
            @Nullable final C defaultValue,
            final String revision
    ); boolean cleanWorkingDirectory(); @Deprecated GitDirectoryRefresher createRefresherTask(final String username, final String password); GitDirectoryRefresher createRefresherTask(); @Override void doInWorkingDirectory(
            final ChangeMetadata changeMetadata,
            final String previousVersion,
            final FileBasedProctorStore.ProctorUpdater updater
    ); @Override TestVersionResult determineVersions(final String fetchRevision); void checkoutBranch(final String branchName); @Override void close(); @Override String getAddTestRevision(); void refresh();  }### Answer:
@Test public void testParseTestName() { assertEquals( "testname", GitProctorCore.parseTestName("matrices/test-definitions", "matrices/test-definitions/testname/definition.json") ); assertEquals( "testname", GitProctorCore.parseTestName("matrices/test-definitions", "matrices/test-definitions/testname/metadata.json") ); assertEquals( "testname", GitProctorCore.parseTestName("test-definitions", "test-definitions/testname/definition.json") ); assertEquals( "testname", GitProctorCore.parseTestName("", "testname/definition.json") ); assertNull(GitProctorCore.parseTestName("matrices/test-definitions", "")); assertNull(GitProctorCore.parseTestName("matrices/test-definitions", "some_file.txt")); assertEquals( "testname", GitProctorCore.parseTestName("matrices/test-definitions", "matrices/test-definitions/testname/some/file") ); assertEquals( null, GitProctorCore.parseTestName("matrices/test-definitions", "matrices/test-definitions/filename") ); }