public void ShouldDisplayTheCorrectPostfixNotation(string input, string expectedOutput) { // ARRANGE input = Helper.RemoveWhiteSpace(input: input); IShuntingYard sy = new ShuntingYard(input: input); sy.ConvertToPostfix(); // ACT string output = Helper.ConvertToString(input: sy.GetPostfix()); // ASSERT Assert.Equal(expectedOutput, output); }