Моро

App.Tests/App.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
+    <PackageReference Include="xunit" Version="2.4.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
+    <PackageReference Include="coverlet.collector" Version="1.2.0" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\App\App.csproj" />
+  </ItemGroup>
+
+</Project>

App.Tests/UnitTest1.cs

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+using System;
+using Xunit;
+
+namespace App.Tests
+{
+    public class UnitTest1
+    {
+        [Fact]
+        public void Test1()
+        {
+            Duck2 donald = new Duck2();
+            string s = Duck2.swim();
+            Assert.Equal("Утка плавает по озеру", s);
+        }
+
+        [Fact]
+        public void Test2()
+        {
+            Duck2 donald = new Duck2();
+            string d = donald.Display();
+            Assert.Equal("I'm duck", d);
+        }
+
+        [Fact]
+        public void Test3()
+        {
+            Duck2 donald = new Duck2();
+            string f = donald.Fly();
+            Assert.Equal("Утка летает", f);
+        }
+
+        [Fact]
+        public void Test4()
+        {
+            Duck2 donald = new Duck2();
+            string q = donald.Quack();
+            Assert.Equal("Утка крякает", q);
+        }
+    }
+}