@Test
public void pixelReturnsCorrectColor() {

  int givenX = 10;
  int givenY = 20;
  int colorIntStub = 100;
  when(bitmapMock.getPixel(givenX, givenY)).thenReturn(colorIntStub);
  AxeColor returnedAxeColor = testSubject.pixel(givenX, givenY);
  Assert.assertEquals(returnedAxeColor, new AxeColor(colorIntStub));
}