ThrowsNothing Constraint

ThrowsNothingConstraint tests that the code under test does not throw any exception.

Usage

Throws.Nothing

Examples

[Test]
public void ThrowsNothingConstraint_Examples()
{
    // Test that method completes without throwing
    Assert.That(() => Add(1, 2), Throws.Nothing);

    // Verify cleanup doesn't throw
    var resource = new DisposableResource();
    Assert.That(() => resource.Dispose(), Throws.Nothing);
}

private static int Add(int a, int b) => a + b;

private class DisposableResource : IDisposable
{
    public void Dispose() { }
}

Notes

  1. Use Throws.Nothing to explicitly verify that code doesn't throw.
  2. This is different from not testing at all - it documents the expectation.
  3. If the delegate throws any exception, the constraint fails with the exception details.

See Also