SameAsConstraint - jnm2/nunit-docs-wiki GitHub Wiki
A SameAsConstraint is used to test whether the object passed as an actual value has the same identity as the object supplied in its constructor.
SameAsConstraint(object expected)Is.SameAs(object expected)Exception ex1 = new Exception();
Exception ex2 = ex1;
Assert.That(ex2, Is.SameAs(ex1));
Exception ex3 = new Exception();
Assert.That(ex3, Is.Not.SameAs(ex1));