DefaultFloatingPointTolerance Attribute

The DefaultFloatingPointToleranceAttribute is used to indicate that comparisons of values of types float and double - within the test method, class, or assembly marked with the attribute - should use the tolerance specified in the constructor unless a specific tolerance is given for the comparison.

Examples

[TestFixture]
[DefaultFloatingPointTolerance(1)]
public class ToleranceTest
{
    [Test]
    public void ComparisonUsingDefaultFloatingPointToleranceFromFixture()
    {
        // Passes due to the DefaultFloatingPointToleranceAttribute from the fixture.
        Assert.That(1f, Is.EqualTo(2));
    }

    [Test]
    public void ComparisonOfIntegersDoNotUseTolerance()
    {
        // Fails as DefaultFloatingPointTolerance only effects comparisons
        // of floats and doubles.
        Assert.That(1, Is.EqualTo(2));
    }

    [Test]
    public void ComparisonUsingSpecificTolerance()
    {
        // Fails as 1 is not equal to 2 using the speficied tolerance 0.
        Assert.That(1f, Is.EqualTo(2).Within(0));
    }

    [Test]
    [DefaultFloatingPointTolerance(2)]
    public void ComparisonUsingDefaultFloatingPointToleranceFromTest()
    {
        // Passes due to the  DefaultFloatingPointTolerance from the test.
        Assert.That(2f, Is.EqualTo(4));
    }
}

See also...

• Assert.AreEqual
• EqualConstraint