我有一个由.NET Core 中的托管服务实现的后台任务。这个类的逻辑很少:
public class IndexingService : IHostedService, IDisposable
{
private readonly int indexingFrequency;
private readonly IIndexService indexService;
private readonly ILogger logger;
private bool isRunning;
private Timer timer;
public IndexingService(ILogger<IndexingService> logger, IIndexService indexService, IndexingSettings indexingSettings)
{
this.logger = logger;
this.indexService = indexService;
this.indexingFrequency = indexingSettings.IndexingFrequency;
}
public void Dispose()
{
this.timer?.Dispose();
}
public Task StartAsync(CancellationToken cancellationToken)
{
this.timer = new Timer(this.DoWork, null, TimeSpan.Zero, TimeSpan.FromSeconds(this.indexingFrequency));
return Task.CompletedTask;
}
public Task StopAsync(CancellationToken cancellationToken)
{
this.timer?.Change(Timeout.Infinite, 0);
return Task.CompletedTask;
}
private void DoWork(object state)
{
if (this.isRunning)
{
// Log
return;
}
try
{
this.isRunning = true;
this.indexService.IndexAll();
}
catch (Exception e)
{
// Log, The background task should never throw.
}
finally
{
this.isRunning = false;
}
}
}
我的Startup
样子:
public void ConfigureServices(IServiceCollection services)
{
services.AddHostedService<IndexingService>();
services.AddTransient<IIndexService, IndexService>();
// 'IndexingSettings' is read from appsetting and registered as singleton
}
如何对DoWork
方法中的逻辑进行单元测试?问题是托管服务是由框架管理的,我不知道如何隔离这个类。