public void ClearHistory_ShouldHaveNoResultsAfterClearHistory() { List <EquationCalculation> equations = EquationsToBeStored; var calucaltorModel = new CalculatorModel(); foreach (EquationCalculation data in equations) { calucaltorModel.CalculateFromText(data.Equation); } calucaltorModel.ClearHistory(); Assert.Empty(calucaltorModel.Results); }