tests

.idea/.idea.calculatorEshkeree/.idea/vcs.xml

@@ -1,4 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="VcsDirectoryMappings" defaultProject="true" />
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
 </project>

TestCalculatorEshkeree/.idea/.idea.TestCalculatorEshkeree.dir/.idea/.gitignore

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

TestCalculatorEshkeree/.idea/.idea.TestCalculatorEshkeree.dir/.idea/encodings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
+</project>

TestCalculatorEshkeree/.idea/.idea.TestCalculatorEshkeree.dir/.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>

TestCalculatorEshkeree/.idea/.idea.TestCalculatorEshkeree.dir/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>

TestCalculatorEshkeree/TestCalculatorEshkeree.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+
+        <IsPackable>false</IsPackable>
+        <IsTestProject>true</IsTestProject>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Avalonia.Headless" Version="11.2.5" />
+        <PackageReference Include="coverlet.collector" Version="6.0.0" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+        <PackageReference Include="NUnit" Version="3.14.0" />
+        <PackageReference Include="NUnit.Analyzers" Version="3.9.0" />
+        <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <Using Include="NUnit.Framework" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\calculatorEshkeree\calculatorEshkeree.csproj" />
+    </ItemGroup>
+
+</Project>

TestCalculatorEshkeree/UnitTest1.cs

@@ -0,0 +1,481 @@
+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);
+    }
+}

TestCalculatorEshkeree/bin/Debug/net8.0/TestCalculatorEshkeree.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
+    }
+  }
+}

TestCalculatorEshkeree/bin/Debug/net8.0/calculatorEshkeree.deps.json

@@ -0,0 +1,635 @@
+{
+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v8.0",
+    "signature": ""
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETCoreApp,Version=v8.0": {
+      "calculatorEshkeree/1.0.0": {
+        "dependencies": {
+          "Avalonia": "11.2.1",
+          "Avalonia.Desktop": "11.2.1",
+          "Avalonia.Diagnostics": "11.2.1",
+          "Avalonia.Fonts.Inter": "11.2.1",
+          "Avalonia.Themes.Fluent": "11.2.1"
+        },
+        "runtime": {
+          "calculatorEshkeree.dll": {}
+        }
+      },
+      "Avalonia/11.2.1": {
+        "dependencies": {
+          "Avalonia.BuildServices": "0.0.29",
+          "Avalonia.Remote.Protocol": "11.2.1",
+          "MicroCom.Runtime": "0.11.0"
+        },
+        "runtime": {
+          "lib/net8.0/Avalonia.Base.dll": {
+            "assemblyVersion": "11.2.1.0",
+            "fileVersion": "11.2.1.0"
+          },
+          "lib/net8.0/Avalonia.Controls.dll": {
+            "assemblyVersion": "11.2.1.0",
+            "fileVersion": "11.2.1.0"
+          },
+          "lib/net8.0/Avalonia.DesignerSupport.dll": {
+            "assemblyVersion": "0.7.0.0",
+            "fileVersion": "0.7.0.0"
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+    }
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+}

TestCalculatorEshkeree/bin/Debug/net8.0/calculatorEshkeree.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
+    }
+  }
+}