1.下载   https://marketplace.visualstudio.com/items?itemName=RandomEngy.UnitTestBoilerplateGenerator

2.

public static AppSettings GetSettings()
{
var envVariable = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
var env = $"env: {envVariable}";
var config = new ConfigurationBuilder()
.AddJsonFile("appsettings.json")
.AddJsonFile($"appsettings.{envVariable}.json", optional: true)
.Build();

var result = config.Get<AppSettings>();
return result;

//var list = new List<string>();
//config.GetSection("StringList").Bind(list);
}
}

ConfigurationManager.AppSettings is a static dependency, so how can you unit test? Actually it's pretty easy - GetSection, Save, RefreshSection.
The only caveat is you must have an app.config in your test project, even if it's empty.

ConnectionStrings

The corresponding code for a connection string.

3.

var options = new AbOptions(){ cc = new cc { D1 = "https://", D2 = "123145854170887" } }; var mock = new Mock<IOptionsSnapshot<AbOptions>>(); mock.Setup(m => m.Value).Returns(options); var service = new AbClass(mock.Object);

4.

ound it. i have to bind the instance

var optionValue  = new MyOptions();
_config.GetSection("MyOptions").Bind(optionValue);var options = Options.Create<MyOptions>(optionValue);

or i can also do

 var optionValue = _config.GetSection("MyOptions").Get<MyOptions>();var options = Options.Create<MyOptions>(optionValue);

var mock = new Mock<ILogger<BlogController>>(); ILogger<BlogController> logger = mock.Object; //or use this short equivalent  logger = Mock.Of<ILogger<BlogController>>() var controller = new BlogController(logger);

You probably will need to install Microsoft.Extensions.Logging.Abstractions package to use ILogger<T>.

Moreover you can create a real logger:

var serviceProvider = new ServiceCollection() .AddLogging() .BuildServiceProvider(); var factory = serviceProvider.GetService<ILoggerFactory>(); var logger = factory.CreateLogger<BlogController>();

https://github.com/Moq/moq4/wiki/Quickstart

https://martinwilley.com/net/code/appsettingtest.html

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