MockWebServer: llegalStateException: start() already called

Question

I try to run a test with MockWebServer.

I would like to make a UI test with mocked response, so I could test for valid\invalid UI changes like logging in, or showing error in a login API.

However, each and every time I ran the code I got the following exception:

java.lang.IllegalStateException: start() already called

Code:

@RunWith(AndroidJUnit4.class)
public class UITestPlayground {

    String testUrl = "http://testurl.com/";
    MockWebServer server = new MockWebServer();

    @Rule
    public IntentsTestRule<LoginActivity> mIntentsRule = new IntentsTestRule<>(LoginActivity.class);

    @Before
    public void beforeHelper() throws IOException {
        TestHelper.removeUserAndTokenIfAny(mIntentsRule.getActivity());
        URLS.baseUrl = testUrl;
        server.url(URLS.baseUrl);
        //try to shutting down the server JUT IN CASE...
        server.shutdown();
        server.start();

    }

    @After
    public void afterHelper() throws IOException {
        server.shutdown();
    }


    @Test
    public void invalidLoginDueNotValidJSONResponse() {

        server.enqueue(new MockResponse().setBody("Something not valid JSON response"));

        String emailToBeTyped = "[email protected]";
        String passToBeTyped = "passtest";

        ViewActions.closeSoftKeyboard();
        // Type text and then press the button.
        onView(withId(R.id.login_email_edit)).perform(typeText(emailToBeTyped));
        ViewActions.closeSoftKeyboard();
        onView(withId(R.id.login_pass_edit)).perform(typeText(passToBeTyped));
        ViewActions.closeSoftKeyboard();
        onView(withId(R.id.log_in_btn)).perform(click());

        //TODO: check on valid error message appearing

    }
 }

---

What am I doing wrong? The .start() only called once, I even .shutdown() just in case... I don't understand how could it called more than once.

Thanks in advance.

Answer 1

In the original example at github I have found that the order is reversed.

You actually start the server, THEN sets it's url.

And not setting the url then starting the server.

Interesting.