Play Framework 2.4.0 unit-testing issue - unit-testing

Question

My problem is as follows:
I am trying to test multiple unit-tests in my controller in a Play Framework 2.4 application. I figured out I need to use a FakeApplication to run the FakeRequests to my controllers in, but for some odd reason the unit-tests work if I start and stop a new FakeApplication. If I start and stop the same FakeApplication, the first unit-test with a FakeRequest works, and the rest dont.
My question:
What am I doing wrong? Why are my unit-tests working if I start and stop a new FakeApplication, and why are they not working if I start and stop the same FakeApplication?
Here is my code snippet:
UnitTest class:
#Test
public void submitTestCorrectInput() {
final String input = CORRECT_INPUT;
final Result result = doCall(input);
assertThat(result.status(), is(equalTo(Http.Status.OK)));
}
#Test
public void submitTestIncorrectInput() {
final String input = INCORRECT_INPUT;
final Result result = doCall(input);
assertThat(result.status(), is(equalTo(Http.Status.NOT_FOUND)));
}
private Result doCall(final String input, final String max, final String filter) {
final Http.RequestBuilder requestBuilder = Helpers.fakeRequest(routes.Application.submit(input));
return route(requestBuilder);
}
Superclass from unittest class:
#Before
public void setUp() {
Play.start(Helpers.fakeApplication().getWrappedApplication());
}
#After
public void tearDown() {
Play.stop(Helpers.fakeApplication().getWrappedApplication());
}