Use MockWebserver to test getPokemon

TestGetPokemon.java

    @Test
    public void testOnSceneAdded() {
        reset(mainSceneMock);
        MainPresenterImpl presenter = new MainPresenterImpl(schedulersProvider, pokemonService);

        presenter.onSceneAdded(mainSceneMock, null);

        testScheduler.triggerActions();

        ArgumentCaptor<String> captor = ArgumentCaptor.forClass(String.class);

        verify(mainSceneMock).setApiText(captor.capture());

        assertEquals("Id : 12", captor.getValue());
    }