public void NullGuidTest() { var prm1 = new SqlParameter("1", SqlDbType.UniqueIdentifier) { Value = System.DBNull.Value }; prm1.GetNullableGuid().Should().BeNull("that was a null database guid value"); prm1.GetGuid().Should().Be(Guid.Empty, "that was a null database guid value"); var prm2 = new SqlParameter("2", SqlDbType.UniqueIdentifier) { Value = Guid.Empty }; prm2.GetGuid().Should().Be(Guid.Empty, "that was an empty database guid value"); prm2.GetNullableGuid().Should().Be(Guid.Empty, "that was an empty database guid value"); }