public void TestSumAndProduct_FixedTests()
{
Check(2, 2, 4, 4);
Check(3, 5, 8, 15);
Check(1.25, 7.8, 9.05, 9.75);
Check(-2, -2, -4, 4);
Assert.AreEqual(null, FindTwoDoublesForGivenSumAndProduct.FindDoubles(2, 7 / 3),
"(2, 7/3) requires 'null' as return value");
}
public void Check(double x1, double x2, double sum, double product)
{
Tuple <double, double> actual = FindTwoDoublesForGivenSumAndProduct.FindDoubles(sum, product);
if (actual == null)
{
Assert.Fail("Actual cannot be null for ({0}, {1})", sum, product);
}
actual = new Tuple <double, double>(Math.Round(actual.Item1, 5), Math.Round(actual.Item2, 5));
x1 = Math.Round(x1, 5);
x2 = Math.Round(x2, 5);
// Rounding to 5 decimals, to avoid errors for very minor rounding errors,
// caused by the fact that all numbers stored as a double have a
// limited amount of decimals, so rounding might happen, which can cause a
// very small difference in expected and actual solutions, but small enough
// so rounding to 5 digits should equalize them.
if (!((actual.Item1 == x1 && actual.Item2 == x2) ||
(actual.Item1 == x2 && actual.Item2 == x1)))
{
Assert.Fail("Invalid output for input ({0}, {1}); expected was: ({2}, {3}), but actual was: ({4}, {5})",
sum, product, x1, x2, actual.Item1, actual.Item2);
}
}
