public void ShouldSuccessCalculateIntegralViaLeftRectMethodRelative(double a, double b, int n, double expectedResult, int eps) { IntegrateOptions options = new IntegrateOptions() { StartX = a, EndX = b, Steps = n, Function = TestFunc }; double actualResult = Integrals.LeftRect(options); Assert.IsTrue(Math.Abs(expectedResult - actualResult) / Math.Abs(expectedResult) * 100 <= eps); }