Explain

This is a recurring project for coverlet-coverage/coverlet#922 (The type of dependency injection does not recognize coverage)

The current conclusion

• Calling Program.CreateHostBuilder(new string[0]).ConfigureWebHost(webBuilder => { }).Start(); (static constructor/constructor) from the unit test class base class results in Implement project coverage of 0.
• Calling (static constructor/constructor /TestInitialize) from the unit test class does not occur (However, it will cause coverage recognition of this class to fail, and other normal test classes to recognize normal) (see: TestIWeekLogic.cs)
• Based on the above situation, I think Program.CreateHostBuilder(new string[0]).ConfigureWebHost(webBuilder => { }).Start(); will lead to the failure of test class coverage identification
• If you are using Visual Studio 2019, all of the above can be identified normally

Solution

• The problem HostingAbstractionsHostBuilderExtensions.Start(this IHostBuilder hostBuilder);, just change it to IHostBuilder.Build();.Using Program.CreateHostBuilder(new string[0]).ConfigureWebHost(webBuilder => { }).Build(); replace Program.CreateHostBuilder(new string[0]).ConfigureWebHost(webBuilder => { }).Start();.I can't explain the deeper reason, if anyone knows, please let me know, I'd appreciate it

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Coverage result

1. This is the Implement failure case for all test classes
2. This is a case of just TestIWeekLogic failing
3. This is the normal case of
4. This is a comparison of Visual Studio 2019 in case 1
   

Manual operation

1. Visual Studio 2019
   1. Open project Coverlet.Console.TestProject.sln using Visual Studio 2019
   2. Top menu bar "Test(S) -> Analyze code coverage for all tests(C)"
   3. See the results in "Code coverage Results" displayed
2. coverlet.console
   1. run Coverlet.Console.Test.bat
   2. View the results in the console window that pops up

Remark

• This document is a translation version, original text see: README_zh-cn