public void testSystemProperty() throws Exception {
System.setProperty("docker.username","roland");
System.setProperty("docker.password", "secret");
System.setProperty("docker.email", "roland@jolokia.org");
try {
AuthConfig config = factory.createAuthConfig(null,"test/test",settings);
verifyAuthConfig(config,"roland","secret","roland@jolokia.org");
} finally {
System.clearProperty("docker.username");
System.clearProperty("docker.password");
System.clearProperty("docker.email");