It is all about the ducks (Ткачев)

.github/workflows/dotnetcore.yml

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+name: .NET Core
+
+on: [push,  pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 2.1.802
+    - name: Build with dotnet
+      run: |
+        cd CourseApp 
+        dotnet build --configuration Release
+    - name: Run tests
+      run: |
+        cd CourseApp.Tests
+        dotnet test

.gitignore

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+# Download this file using PowerShell v3 under Windows with the following comand:
+# Invoke-WebRequest https://gist.githubusercontent.com/kmorcinek/2710267/raw/ -OutFile .gitignore
+# or wget:
+# wget --no-check-certificate http://gist.githubusercontent.com/kmorcinek/2710267/raw/.gitignore
+
+# User-specific files
+*.suo
+*.user
+*.sln.docstates
+
+# Build results
+
+[Dd]ebug/
+[Rr]elease/
+x64/
+build/
+[Bb]in/
+[Oo]bj/
+
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/packages/*
+# except build/, which is used as an MSBuild target.
+!**/packages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+*_i.c
+*_p.c
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.log
+*.scc
+
+# OS generated files #
+.DS_Store*
+Icon?
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opensdf
+*.sdf
+*.cachefile
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# NCrunch
+*.ncrunch*
+.*crunch*.local.xml
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.Publish.xml
+
+# Windows Azure Build Output
+csx
+*.build.csdef
+
+# Windows Store app package directory
+AppPackages/
+
+# Others
+*.Cache
+ClientBin/
+# [Ss]tyle[Cc]op.*
+~$*
+*~
+*.dbmdl
+*.[Pp]ublish.xml
+*.pfx
+*.publishsettings
+modulesbin/
+tempbin/
+
+# EPiServer Site file (VPP)
+AppData/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file to a newer
+# Visual Studio version. Backup files are not needed, because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# vim
+*.txt~
+*.swp
+*.swo
+
+# svn
+.svn
+
+# Remainings from resolvings conflicts in Source Control
+*.orig
+
+# SQL Server files
+**/App_Data/*.mdf
+**/App_Data/*.ldf
+**/App_Data/*.sdf
+
+
+#LightSwitch generated files
+GeneratedArtifacts/
+_Pvt_Extensions/
+ModelManifest.xml
+
+# =========================
+# Windows detritus
+# =========================
+
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Mac desktop service store files
+.DS_Store
+
+# SASS Compiler cache
+.sass-cache
+
+# Visual Studio 2014 CTP
+**/*.sln.ide
+
+# Visual Studio temp something
+.vs/
+
+# VS 2015+
+*.vc.vc.opendb
+*.vc.db
+
+# Rider
+.idea/
+
+**/node_modules/*
+
+# Added by Jskonst
+.vscode/
+Properties/
+
+#####
+# End of core ignore list, below put you custom 'per project' settings (patterns or path)
+#####

CourseApp.Tests/CourseApp.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
+    <NoWarn>1573,1591,1701;1702;1705</NoWarn>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
+    <PackageReference Include="xunit" Version="2.4.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
+    <PackageReference Include="StyleCop.Analyzers" Version="1.0.2" PrivateAssets="all" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\CourseApp\CourseApp.csproj" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <CodeAnalysisRuleSet>../_stylecop/stylecop.ruleset</CodeAnalysisRuleSet> 
+    <GenerateFullPaths>true</GenerateFullPaths>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <AdditionalFiles Include="../_stylecop/stylecop.json" />
+  </ItemGroup>
+
+</Project>

CourseApp.Tests/DuckTest.cs

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+using System;
+using Xunit;
+
+namespace CourseApp.Tests
+{
+    public class DuckTest
+    {
+        [Fact]
+        public void Test1()
+        {
+            Drake a = new Drake();
+            string s = Drake.Swim();
+            Assert.Equal("Water is acceptable.", s);
+        }
+
+        [Fact]
+        public void Test2()
+        {
+            Drake a = new Drake();
+            string d = a.Display();
+            Assert.Equal("Kono Ahiru Da!", d);
+        }
+
+        [Fact]
+        public void Test3()
+        {
+            IFly a = new Drake();
+            string f = a.Fly();
+            Assert.Equal("5 minutes, flight is fine.", f);
+        }
+
+        [Fact]
+        public void Test4()
+        {
+            IQuack a = new Drake();
+            string q = a.Quack();
+            Assert.Equal("Quack-Quack!", q);
+        }
+    }
+}

CourseApp/CourseApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
+    <NoWarn>1573,1591,1701;1702;1705;</NoWarn>
+  </PropertyGroup>
+
+   <ItemGroup>
+    <PackageReference Include="StyleCop.Analyzers" Version="1.0.2" PrivateAssets="all" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <CodeAnalysisRuleSet>../_stylecop/stylecop.ruleset</CodeAnalysisRuleSet> 
+    <GenerateFullPaths>true</GenerateFullPaths>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <AdditionalFiles Include="../_stylecop/stylecop.json" />
+  </ItemGroup>
+
+</Project>

CourseApp/CourseApp.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28307.852
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CourseApp", "CourseApp.csproj", "{17CB0273-34D3-4D23-965F-FC4AD0A83D0F}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CourseApp.Tests", "..\CourseApp.Tests\CourseApp.Tests.csproj", "{E0133767-62A2-4B4A-87A2-BD09BC775E0A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{17CB0273-34D3-4D23-965F-FC4AD0A83D0F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{17CB0273-34D3-4D23-965F-FC4AD0A83D0F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{17CB0273-34D3-4D23-965F-FC4AD0A83D0F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{17CB0273-34D3-4D23-965F-FC4AD0A83D0F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E0133767-62A2-4B4A-87A2-BD09BC775E0A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E0133767-62A2-4B4A-87A2-BD09BC775E0A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E0133767-62A2-4B4A-87A2-BD09BC775E0A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E0133767-62A2-4B4A-87A2-BD09BC775E0A}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1849B280-B447-4D18-9764-F412B7768C4F}
+	EndGlobalSection
+EndGlobal

CourseApp/Drake.cs

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+using System;
+
+namespace CourseApp
+{
+public class Drake : Duck, IFly, IQuack
+{
+public Drake()
+{
+}
+
+public override string Display()
+{
+return "Kono Ahiru Da!";
+}
+}
+}