public void ArgsShouldBeReportedInInvariantCulture() { var dateTime = new DateTime(2000, 5, 22, 13, 43, 21); var result = CombinationApprovals.GetApprovalString(d => "test", Enumerable.Repeat(dateTime, 1)); Assert.That(result, Is.StringContaining(dateTime.ToString(CultureInfo.InvariantCulture))); }