@Test public void testCalculateRadius() {

	// Arrange:
	final View view = new View(context);
	view.setLeft(0);
	view.setRight(100);
	view.setTop(0);
	view.setBottom(200);
	// Act + Assert:
	assertThat(Reveal.calculateRadius(view), is((float) Math.sqrt(Math.pow(view.getWidth(), 2) + Math.pow(view.getHeight(), 2))));
}