@Rule
public final TemporaryFolder tempDir = new TemporaryFolder();
@Test
public void instantiationWithEmptyFileSource() throws IOException {
Options options = new WireMockConfiguration().fileSource(new SingleRootFileSource(tempDir.getRoot()));
WireMockServer wireMockServer = null;
try {
wireMockServer = new WireMockServer(options);
wireMockServer.start();