calculator/TestCalculatorEshkeree/UnitTest1.cs

using NUnit.Framework;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Headless;
using calculatorEshkeree;

namespace TestCalculatorEshkeree;

[TestFixture]
public class CalculatorTests
{
    private MainWindow _mainWindow;

    [OneTimeSetUp]
    public void GlobalSetup()
    {
        AppBuilder.Configure<App>()
            .UseHeadless(new AvaloniaHeadlessPlatformOptions())
            .SetupWithoutStarting();
    }

    [SetUp]
    public void Setup()
    {
        _mainWindow = new MainWindow();
    }
    
    [Test]
    public void AddTwoNumbers_ShouldReturnCorrectSum_WhenBothNumbersArePositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "+" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("5", _mainWindow.DisplayText);
    }

    [Test]
    public void AddTwoNumbers_ShouldReturnCorrectSum_WhenFirstNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "+" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("1", _mainWindow.DisplayText);
    }
    
    [Test]
    public void AddTwoNumbers_ShouldReturnCorrectSum_WhenSecondNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "+" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = -3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("-1", _mainWindow.DisplayText);
    }
    
    [Test]
    public void AddTwoNumbers_ShouldReturnCorrectSum_WhenBothNumbersAreNegative()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "+" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = -3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("-5", _mainWindow.DisplayText);
    }
    
    [Test]
    public void AddTwoNumbers_ShouldReturnCorrectSum_WhenBothNumbersAreZeros()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "+" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("0", _mainWindow.DisplayText);
    }
    
    [Test]
    public void SubtractTwoNumbers_ShouldReturnCorrectSubtraction_WhenBothNumbersArePositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 5 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "-" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("2", _mainWindow.DisplayText);
    }
    
    [Test]
    public void SubtractTwoNumbers_ShouldReturnCorrectSum_WhenFirstNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 5 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "-" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = -3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("8", _mainWindow.DisplayText);
    }
    
    [Test]
    public void SubtractTwoNumbers_ShouldReturnCorrectSum_WhenSecondNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = -5 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "-" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("-8", _mainWindow.DisplayText);
    }
    
    [Test]
    public void SubtractTwoNumbers_ShouldReturnCorrectSum_WhenBothNumbersAreNegative()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "-" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = -3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("1", _mainWindow.DisplayText);
    }
    
    [Test]
    public void SubtractTwoNumbers_ShouldReturnCorrectSum_WhenBothNumbersAreZeros()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "-" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("0", _mainWindow.DisplayText);
    }
    
    [Test]
    public void MultiplyTwoNumbers_ShouldReturnCorrectMultiplication_WhenBothNumbersArePositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "*" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 3 }, null);
    
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

    
        Assert.AreEqual("6", _mainWindow.DisplayText);
    }
    
        [Test]
    public void MultiplyTwoNumbers_ShouldReturnCorrectSum_WhenFirstNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 5 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "*" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = -3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("-15", _mainWindow.DisplayText);
    }
    
    [Test]
    public void MultiplyTwoNumbers_ShouldReturnCorrectSum_WhenSecondNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = -5 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "*" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("-15", _mainWindow.DisplayText);
    }
    
    [Test]
    public void MultiplyTwoNumbers_ShouldReturnCorrectSum_WhenBothNumbersAreNegative()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "*" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = -3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("6", _mainWindow.DisplayText);
    }
    
    [Test]
    public void MultiplyTwoNumbers_ShouldReturnCorrectSum_WhenBothNumbersAreZeros()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "*" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("0", _mainWindow.DisplayText);
    }
    
    [Test]
    public void DivideTwoNumbers_ShouldReturnCorrectDivision_WhenBothNumbersArePositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 6 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 3 }, null);
    
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
    
        Assert.AreEqual("2", _mainWindow.DisplayText);
    }
    
            [Test]
    public void DivideTwoNumbers_ShouldReturnCorrectDivision_WhenFirstNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 6 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = -3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("-2", _mainWindow.DisplayText);
    }
    
    [Test]
    public void DivideTwoNumbers_ShouldReturnCorrectDivision_WhenSecondNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = -6 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("-2", _mainWindow.DisplayText);
    }
    
    [Test]
    public void DivideTwoNumbers_ShouldReturnCorrectDivision_WhenBothNumbersAreNegative()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = -6 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = -3 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("2", _mainWindow.DisplayText);
    }
    
    [Test]
    public void DivideTwoNumbers_ShouldReturnCorrectDivision_WhenBothNumbersAreZeros()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);

        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);

        Assert.AreEqual("err", _mainWindow.DisplayText);
    }

    [Test]
    public void CalculateSinOfNumber_ShouldReturnCorrectResult_WhenNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "45" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "sin" }, null);

        double expected = Math.Sin(45 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }
    
    [Test]
    public void CalculateSinOfNumber_ShouldReturnCorrectResult_WhenNumberIsNegative()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "-45" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "sin" }, null);

        double expected = Math.Sin(-45 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }
    
    [Test]
    public void CalculateSinOfNumber_ShouldReturnCorrectResult_WhenNumberIsZero()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "0" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "sin" }, null);

        double expected = Math.Sin(0 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }
    
    [Test]
    public void CalculateCosOfNumber_ShouldReturnCorrectResult_WhenNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "45" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "cos" }, null);

        double expected = Math.Cos(45 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }
    
    [Test]
    public void CalculateCosOfNumber_ShouldReturnCorrectResult_WhenNumberIsNegative()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "-45" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "cos" }, null);

        double expected = Math.Cos(-45 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }
    
    [Test]
    public void CalculateCosOfNumber_ShouldReturnCorrectResult_WhenNumberIsZero()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "0" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "cos" }, null);

        double expected = Math.Cos(0 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }
    
    [Test]
    public void CalculateTgOfNumber_ShouldReturnCorrectResult_WhenNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "45" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "tg" }, null);

        double expected = Math.Tan(45 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }
    
    [Test]
    public void CalculateTgOfNumber_ShouldReturnCorrectResult_WhenNumberIsNegative()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "-45" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "tg" }, null);

        double expected = Math.Tan(-45 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }
    
    [Test]
    public void CalculateTgOfNumber_ShouldReturnCorrectResult_WhenNumberIsZero()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "0" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "tg" }, null);

        double expected = Math.Tan(0 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }
    
    [Test]
    public void CalculateCtgOfNumber_ShouldReturnCorrectResult_WhenNumberIsPositive()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "45" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "ctg" }, null);

        double expected = 1 / Math.Tan(45 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }
    
    [Test]
    public void CalculateCtgOfNumber_ShouldReturnCorrectResult_WhenNumberIsNegative()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "-45" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "ctg" }, null);

        double expected = 1 / Math.Tan(-45 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }
    
    [Test]
    public void CalculateCtgOfNumber_ShouldReturnCorrectResult_WhenNumberIsZero()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "0" }, null);
        _mainWindow.OnOperationButtonClick(new Button { Content = "ctg" }, null);

        double expected = 1 / Math.Tan(0 * Math.PI / 180);
        Assert.AreEqual(expected.ToString(), _mainWindow.DisplayText);
    }

    [Test]
    public void ConclusionAllNumbers_ShouldReturnCorrectResult_WhenPressedAllNumbers()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "1" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "2" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "3" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "4" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "5" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "6" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "7" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "8" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "9" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "0" }, null);
        
        Assert.AreEqual("1234567890", _mainWindow.DisplayText);
    }

    [Test]
    public void ConclusionBigResult_ShouldReturnCorrectResult_WhenNumbersAreBig()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "9" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "9" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "9" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "*" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "9" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "9" }, null);
        _mainWindow.OnNumberButtonClick(new Button { Content = "9" }, null);
        
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        _mainWindow.OnEqualButtonClick(new Button(), null);
        
        Assert.AreEqual("998001", _mainWindow.DisplayText);
    }
    
    [Test]
    public void ClearDisplayText_ShouldReturnClearDisplayText_WhenThreeSymbols()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "123" }, null);
        _mainWindow.OnClearButtonClick(new Button(), null);

        Assert.AreEqual("0", _mainWindow.DisplayText);
    }

    [Test]
    public void ClearDisplayText_ShouldReturnClearDisplayText_WhenFourSymbols()
    {
        _mainWindow.OnNumberButtonClick(new Button { Content = "1234" }, null);
        _mainWindow.OnClearButtonClick(new Button(), null);

        Assert.AreEqual("0", _mainWindow.DisplayText);
    }
}