@Before
public void setUp() throws Exception {
final InstanceFieldPerPropertyConfig config = new InstanceFieldPerPropertyConfig();
proxyServer = new InstrumentingProxyServer(new HtmlUnitBasedScriptInstrumenter(config));
fileServer = new FileServer(new File(getClass().getResource("/tests").toURI()).getAbsolutePath());
proxyServerPort = proxyServer.start();
fileServerPort = fileServer.start();
final String proxyUrl = "localhost:" + proxyServerPort;