.net core2 单元测试

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.

[TestClass]
public class ChangeConfigurationTest
{
    private const string Value = "Hello";
    private const string KeyValue = "MySetting";
 
    private static void ChangeConfiguration()
    {
        //the .config must exist (AppSettings doesn't have to be there).
        //if your test class doesn't have an App.config, this succeeds but the new appSetting is not loaded.
        var config = ConfigurationManager.OpenExeConfiguration(Assembly.GetCallingAssembly().Location);
        var appSettings = (AppSettingsSection)config.GetSection("appSettings");
        appSettings.Settings.Clear();
        appSettings.Settings.Add(KeyValue, Value);
        config.Save();
        ConfigurationManager.RefreshSection("appSettings");
    }
 
    [TestMethod]
    public void TestMethod1()
    {
        var setting = ConfigurationManager.AppSettings[KeyValue];
        Assert.AreEqual(true, string.IsNullOrEmpty(setting));
        ChangeConfiguration();
        setting = ConfigurationManager.AppSettings[KeyValue];
        Assert.AreEqual(Value, setting);
    }
}

ConnectionStrings

The corresponding code for a connection string.

private static void ChangeConfiguration()
{
    var config = ConfigurationManager.OpenExeConfiguration(Assembly.GetCallingAssembly().Location);
    var connectionStrings = (ConnectionStringsSection)config.GetSection("connectionStrings");
    connectionStrings.ConnectionStrings["MyDatabase"]
        .ConnectionString = @"Data Source=C:\Dev\commands.sqlite";
    config.Save();
    ConfigurationManager.RefreshSection("connectionStrings");
}

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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