first

.idea/.idea.RofloCalc/.idea/.gitignore

@@ -0,0 +1,13 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Rider ignored files
+/contentModel.xml
+/projectSettingsUpdater.xml
+/.idea.RofloCalc.iml
+/modules.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/.idea.RofloCalc/.idea/avalonia.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AvaloniaProject">
+    <option name="projectPerEditor">
+      <map>
+        <entry key="RofloCalc/MainWindow.axaml" value="RofloCalc/RofloCalc.csproj" />
+      </map>
+    </option>
+  </component>
+</project>

.idea/.idea.RofloCalc/.idea/indexLayout.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="UserContentModel">
+    <attachedFolders />
+    <explicitIncludes />
+    <explicitExcludes />
+  </component>
+</project>

.idea/.idea.RofloCalc/.idea/vcs.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings" defaultProject="true" />
+</project>

RofloCalc.Test/MainWindowTests.cs

@@ -0,0 +1,676 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Headless;
+using NUnit.Framework;
+using NUnit.Framework.Legacy;
+
+namespace RofloCalc.Test;
+
+[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 = 3 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "+" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+
+        ClassicAssert.AreEqual("7", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void AddTwoNumbers_ShouldReturnCorrectSum_WhenFirstNumberIsNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -3 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "+" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+
+        ClassicAssert.AreEqual("1", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void AddTwoNumbers_ShouldReturnCorrectSum_WhenSecondNumberIsNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 3 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "+" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = -4 }, null);
+
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+
+        ClassicAssert.AreEqual("-1", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void AddTwoNumbers_ShouldReturnCorrectSum_WhenBothNumbersAreNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -3 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "+" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = -4 }, null);
+
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+
+        ClassicAssert.AreEqual("-7", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void AddTwoNumbers_ShouldReturnCorrectSum_WhenOneNumberIsZero()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "+" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+
+        ClassicAssert.AreEqual("4", _mainWindow.DisplayText.Text);
+    }
+    
+    [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);
+
+        ClassicAssert.AreEqual("0", _mainWindow.DisplayText.Text);
+    }
+    
+    
+    //-
+    [Test]
+    public void SubtractTwoNumbers_ShouldReturnCorrectDifference_WhenBothNumbersArePositive()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "-" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("2", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void SubtractTwoNumbers_ShouldReturnCorrectDifference_WhenFirstNumberIsNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -4 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "-" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("-6", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void SubtractTwoNumbers_ShouldReturnCorrectDifference_WhenSecondNumberIsNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "-" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("6", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void SubtractTwoNumbers_ShouldReturnCorrectDifference_WhenBothNumbersAreNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -4 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "-" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("-2", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void SubtractTwoNumbers_ShouldReturnCorrectDifference_WhenOneNumberIsZero()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "-" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("2", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void SubtractTwoNumbers_ShouldReturnZero_WhenBothNumbersAreEqual()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "-" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("0", _mainWindow.DisplayText.Text);
+    }
+    
+    
+    // *
+    [Test]
+    public void MultiplyTwoNumbers_ShouldReturnCorrectProduct_WhenBothNumbersArePositive()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "*" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("4", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void MultiplyTwoNumbers_ShouldReturnCorrectProduct_WhenFirstNumberIsNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "*" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("-4", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void MultiplyTwoNumbers_ShouldReturnCorrectProduct_WhenSecondNumberIsNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "*" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("-4", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void MultiplyTwoNumbers_ShouldReturnCorrectProduct_WhenBothNumbersAreNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "*" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("4", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void MultiplyTwoNumbers_ShouldReturnZero_WhenOneNumberIsZero()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "*" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("0", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void MultiplyTwoNumbers_ShouldReturnZero_WhenBothNumbersAreZero()
+    {
+        _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);
+    
+        ClassicAssert.AreEqual("0", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void MultiplyTwoNumbers_ShouldReturnSameNumber_WhenMultiplyingByOne()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 8 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "*" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 1 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("8", _mainWindow.DisplayText.Text);
+    }
+    
+    
+    // "/"
+    [Test]
+    public void DivideTwoNumbers_ShouldReturnCorrectQuotient_WhenBothNumbersArePositive()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("2", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void DivideTwoNumbers_ShouldReturnCorrectQuotient_WhenFirstNumberIsNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -4 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("-2", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void DivideTwoNumbers_ShouldReturnCorrectQuotient_WhenSecondNumberIsNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("-2", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void DivideTwoNumbers_ShouldReturnCorrectQuotient_WhenBothNumbersAreNegative()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -4 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = -2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("2", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void DivideTwoNumbers_ShouldReturnOne_WhenNumberIsDividedByItself()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("1", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void DivideTwoNumbers_ShouldReturnZero_WhenZeroIsDividedByNonZeroNumber()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("0", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void DivideTwoNumbers_ShouldThrowException_WhenDividingByZero()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = "8" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "/" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = "0" }, null);
+        
+        var exception = Assert.Throws<DivideByZeroException>(() => 
+        {
+            _mainWindow.OnEqualButtonClick(new Button(), null);
+        });
+
+        Assert.That(exception.Message, Is.EqualTo("Нельзя делить на ноль!"));
+    }
+    
+    
+    // ^
+    [Test]
+    public void Power_ShouldReturnCorrectResult_WhenBothNumbersArePositive()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "^" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("4", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void Power_ShouldReturnOne_WhenExponentIsZero()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "^" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("1", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void Power_ShouldReturnZero_WhenBaseIsZeroAndExponentIsPositive()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "^" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("0", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void Power_ShouldReturnOne_WhenBaseIsOneRegardlessOfExponent()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 1 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "^" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 3 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("1", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void Power_ShouldReturnBase_WhenExponentIsOne()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 4 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "^" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 1 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("4", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void Power_ShouldReturnNegativeResult_WhenBaseIsNegativeAndExponentIsOdd()
+    {
+        _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);
+    
+        ClassicAssert.AreEqual("-8", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void Power_ShouldReturnFraction_WhenExponentIsNegative()
+    {
+        _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);
+    
+        ClassicAssert.AreEqual("0,125", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void Power_ShouldReturnCorrectResult_WhenExponentIsFractional()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 0.5 }, null);
+        _mainWindow.OnOperationButtonClick(new Button { Content = "^" }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("0,25", _mainWindow.DisplayText.Text);
+    }
+    
+    
+    // sin
+    [Test]
+    public void Sin_ShouldReturnCorrectResult_WhenInputIsPositiveAngle()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 90 }, null);
+        _mainWindow.OnSinButtonClick(new Button(), null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("1", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void Sin_ShouldReturnCorrectResult_WhenInputIsNegativeAngle()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -90 }, null);
+        _mainWindow.OnSinButtonClick(new Button(), null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("-1", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void Sin_ShouldReturnZero_WhenInputIsZero()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
+        _mainWindow.OnSinButtonClick(new Button(), null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("0", _mainWindow.DisplayText.Text);
+    }
+    
+    
+    // cos
+    [Test]
+    public void Cos_ShouldReturnCorrectResult_WhenInputIsPositiveAngle()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 360 }, null);
+        _mainWindow.OnCosButtonClick(new Button(), null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("1", _mainWindow.DisplayText.Text);
+    }
+    
+    [Test]
+    public void Cos_ShouldReturnCorrectResult_WhenInputIsNegativeAngle()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -360 }, null);
+        _mainWindow.OnCosButtonClick(new Button(), null);
+    
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+    
+        ClassicAssert.AreEqual("1", _mainWindow.DisplayText.Text);
+    }
+    
+    
+    // tg
+    [Test]
+    public void Tg_ShouldReturnCorrectResult_WhenInputIsPositiveAngle()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 45 }, null);
+        _mainWindow.OnTgButtonClick(new Button(), null);
+
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+
+        ClassicAssert.AreEqual("1", _mainWindow.DisplayText.Text);
+    }
+
+    [Test]
+    public void Tg_ShouldReturnCorrectResult_WhenInputIsNegativeAngle()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -45 }, null);
+        _mainWindow.OnTgButtonClick(new Button(), null);
+
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+
+        ClassicAssert.AreEqual("-1", _mainWindow.DisplayText.Text);
+    }
+
+    [Test]
+    public void Tg_ShouldReturnCorrectResult_WhenInputIsZero()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
+        _mainWindow.OnTgButtonClick(new Button(), null);
+
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+
+        ClassicAssert.AreEqual("0", _mainWindow.DisplayText.Text);
+    }
+    
+    
+    // ctg
+    [Test]
+    public void Ctg_ShouldReturnCorrectResult_WhenInputIsPositiveAngle()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 45 }, null);
+        _mainWindow.OnCtgButtonClick(new Button(), null);
+
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+
+        ClassicAssert.AreEqual("1", _mainWindow.DisplayText.Text);
+    }
+
+    [Test]
+    public void Ctg_ShouldReturnCorrectResult_WhenInputIsNegativeAngle()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = -45 }, null);
+        _mainWindow.OnCtgButtonClick(new Button(), null);
+
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+
+        ClassicAssert.AreEqual("1", _mainWindow.DisplayText.Text);
+    }
+
+    [Test]
+    public void Ctg_ShouldReturnCorrectResult_WhenInputIsZero()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 0 }, null);
+        _mainWindow.OnCtgButtonClick(new Button(), null);
+
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+        _mainWindow.OnEqualButtonClick(new Button(), null);
+
+        ClassicAssert.AreEqual("\u221e", _mainWindow.DisplayText.Text);
+    }
+    
+    
+    // Buttons
+    [Test]
+    public void Buttons_ShouldReturnCorrectResult_WhenInputIsZero()
+    {
+        _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);
+
+        ClassicAssert.AreEqual("1234567890", _mainWindow.DisplayText.Text);
+    }
+    
+    
+    // AC
+    [Test]
+    public void ClearButton_ShouldClearDisplayText_ClearButton()
+    {
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+        _mainWindow.OnNumberButtonClick(new Button { Content = 2 }, null);
+        
+        ClassicAssert.AreEqual("22", _mainWindow.DisplayText.Text);
+        
+        _mainWindow.OnClearButtonClick(new Button(), null);
+        
+        ClassicAssert.AreEqual("0", _mainWindow.DisplayText.Text);;
+    }
+}

RofloCalc.Test/RofloCalc.Test.csproj

@@ -0,0 +1,26 @@
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+
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+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+
+        <IsPackable>false</IsPackable>
+        <IsTestProject>true</IsTestProject>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\RofloCalc\RofloCalc.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Avalonia" Version="11.2.5" />
+      <PackageReference Include="Avalonia.Diagnostics" Version="11.2.5" />
+      <PackageReference Include="Avalonia.Headless" Version="11.2.5" />
+      <PackageReference Include="Avalonia.ReactiveUI" Version="11.2.5" />
+      <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
+      <PackageReference Include="NUnit" Version="4.3.2" />
+      <PackageReference Include="NUnit3TestAdapter" Version="5.0.0" />
+    </ItemGroup>
+
+</Project>

RofloCalc.Test/bin/Debug/net8.0/RofloCalc.Test.runtimeconfig.json

@@ -0,0 +1,12 @@
+{
+  "runtimeOptions": {
+    "tfm": "net8.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "8.0.0"
+    },
+    "configProperties": {
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}

RofloCalc.Test/bin/Debug/net8.0/RofloCalc.deps.json

@@ -0,0 +1,635 @@
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RofloCalc.Test/bin/Debug/net8.0/RofloCalc.runtimeconfig.json

@@ -0,0 +1,13 @@
+{
+  "runtimeOptions": {
+    "tfm": "net8.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "8.0.0"
+    },
+    "configProperties": {
+      "System.Runtime.InteropServices.BuiltInComInterop.IsSupported": true,
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}