MultipleOf Constraint

MultipleOfConstraint tests that a numeric value is a multiple of a specified number. It also provides convenient shortcuts for testing even and odd numbers.

Usage

Is.MultipleOf(int factor)
Is.Even
Is.Odd

Examples

[Test]
public void MultipleOfConstraint_Examples()
{
    // Test for multiples
    Assert.That(12, Is.MultipleOf(3));    // 12 is a multiple of 3
    Assert.That(12, Is.MultipleOf(4));    // 12 is a multiple of 4
    Assert.That(12, Is.Not.MultipleOf(5)); // 12 is not a multiple of 5

    // Even numbers
    Assert.That(0, Is.Even);
    Assert.That(2, Is.Even);
    Assert.That(100, Is.Even);
    Assert.That(-4, Is.Even);
    Assert.That(3, Is.Not.Even);

    // Odd numbers
    Assert.That(1, Is.Odd);
    Assert.That(3, Is.Odd);
    Assert.That(99, Is.Odd);
    Assert.That(-7, Is.Odd);
    Assert.That(4, Is.Not.Odd);
}

Notes

  1. Is.Even is equivalent to Is.MultipleOf(2).
  2. Is.Odd is the negation - a number that is not a multiple of 2.
  3. Works with all integer types (int, long, short, etc.).
  4. Zero is considered even (Is.MultipleOf(n) passes for any n when actual is 0).

See Also