var config = new ConfigurationBuilder()
.AddJsonFile("appsettings.Tests.json")
.Build();
var services = new ServiceCollection();
services.AddLogging(options => {
options.AddConfiguration(config.GetSection("Logging"));
options.AddConsole();
options.AddDebug();
});
var serviceProvider = services.BuildServiceProvider();
var loggerFactory = serviceProvider.GetService<ILoggerFactory>();
var logger = loggerFactory.CreateLogger("Test");
logger.LogError("From ctor");
但我没有看到任何日志消息.
解决方法
If you used xUnit.net 1.x,you may have prevIoUsly been writing output to
Console@H_403_15@,Debug@H_403_15@,orTrace@H_403_15@. When xUnit.net v2 shipped with parallelization turned on by default,this output capture mechanism was no longer appropriate; it is impossible to know which of the many tests that could be running in parallel were responsible for writing to those shared resources.
相反,您现在应该使用an explicit mechanism来写入测试输出.基本上,您不是写入控制台,而是写入特殊的ITestOutputHelper.
当然,ASP.NET Core日志记录默认不支持此输出机制.幸运的是,为测试输出编写日志记录提供程序并不困难.我刚刚实现了一个快速提供程序,并在下面的答案中包含它.你可以像这样使用它：
public class Example
{
private readonly ILogger<Example> _logger;
public Example(ITestOutputHelper testOutputHelper)
{
var loggerFactory = new LoggerFactory();
loggerFactory.AddProvider(new XunitLoggerProvider(testOutputHelper));
_logger = loggerFactory.CreateLogger<Example>();
}
[Fact]
public void Test()
{
_logger.LogDebug("Foo bar baz");
}
}
请注意,通常应避免在单元测试中创建完整的依赖项注入容器.在单元测试中使用DI通常表明您的单元测试不是单元测试,而是集成测试.在单元测试中,您应该只测试一个特定单元并明确地传递其所有依赖项 – 而不仅仅是作为模拟.正如您在上面的示例中所看到的,创建记录器实际上是一个非常简单的事情,没有DI.
正如所承诺的,这是运行上面显示的代码所需的XunitLoggerProvider和XunitLogger,以及将Microsoft.Extensions.Logging框架与xUnit测试输出集成：
public class XunitLoggerProvider : ILoggerProvider
{
private readonly ITestOutputHelper _testOutputHelper;
public XunitLoggerProvider(ITestOutputHelper testOutputHelper)
{
_testOutputHelper = testOutputHelper;
}
public ILogger CreateLogger(string categoryName)
=> new XunitLogger(_testOutputHelper,categoryName);
public void Dispose()
{ }
}
public class XunitLogger : ILogger
{
private readonly ITestOutputHelper _testOutputHelper;
private readonly string _categoryName;
public XunitLogger(ITestOutputHelper testOutputHelper,string categoryName)
{
_testOutputHelper = testOutputHelper;
_categoryName = categoryName;
}
public IDisposable BeginScope<TState>(TState state)
=> NoopDisposable.Instance;
public bool IsEnabled(LogLevel logLevel)
=> true;
public void Log<TState>(LogLevel logLevel,EventId eventId,TState state,Exception exception,Func<TState,Exception,string> formatter)
{
_testOutputHelper.WriteLine($"{_categoryName} [{eventId}] {formatter(state,exception)}");
if (exception != null)
_testOutputHelper.WriteLine(exception.ToString());
}
private class NoopDisposable : IDisposable
{
public static NoopDisposable Instance = new NoopDisposable();
public void Dispose()
{ }
}
}
