### Question:
DifferenceOfSquaresCalculator { int computeSquareOfSumTo(int input) { throw new UnsupportedOperationException("Delete this statement and write your own implementation."); }    }### Answer:
@Test public void testSquareOfSumUpToOne() { int expected = 1; int actual = calculator.computeSquareOfSumTo(1); assertEquals(expected, actual); }
@Ignore("Remove to run test") @Test public void testSquareOfSumUpToFive() { int expected = 225; int actual = calculator.computeSquareOfSumTo(5); assertEquals(expected, actual); }
@Ignore("Remove to run test") @Test public void testSquareOfSumUpToHundred() { int expected = 25502500; int actual = calculator.computeSquareOfSumTo(100); assertEquals(expected, actual); }