ResourceManagerTest.java

public class ResourceManagerTest {
  private TestResources resources = new TestResources();
  private ResourceManager resourceManager = new ResourceManager(resources);

  @Test public void shouldNotBeNull() throws Exception {
    assertThat(resourceManager).isNotNull();
  }

  @Test public void getTitle_true_shouldReturnSuccessTitle() throws Exception {
    assertThat(resourceManager.getTitle(true)).isEqualTo("Success");
  }

  @Test public void getTitle_false_shouldReturnErrorTitle() throws Exception {
    assertThat(resourceManager.getTitle(false)).isEqualTo("Error");
  }

  @Test public void getDescription_true_shouldReturnSuccessDescription() throws Exception {
    assertThat(resourceManager.getDescription(true)).isEqualTo("Congrats you did it!");
  }

  @Test public void getDescription_false_shouldReturnErrorDescription() throws Exception {
    assertThat(resourceManager.getDescription(false)).isEqualTo("Uh oh something went wrong");
  }

  private class TestResources extends Resources {
    public TestResources() {
      super(null, null, null);
    }

    @NonNull @Override public String getString(int id) throws NotFoundException {
      switch (id) {
        case R.string.success_title:
          return "Success";
        case R.string.error_title:
          return "Error";
        case R.string.success_description:
          return "Congrats you did it!";
        case R.string.error_description:
          return "Uh oh something went wrong";
      }

      throw new NotFoundException();
    }
  }
}