public async Task IfRunAsyncThrowsItComesBackFromHost()
{
var context = new TestLatches();
using var host = new WebHostBuilder()
.ConfigureServices((hbc, services) =>
{
services.AddSingleton <IServer, FakeServer>();
services.AddSingleton <IHostedService, FakeBackgroundHostedService>();
services.AddSingleton(context);
})
.Configure(app => { })
.Build();
using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(15));
var runTask = host.RunAsync(cts.Token);
#pragma warning disable CA1303 // Do not pass literals as localized parameters
context.RunResult.Throw(new ApplicationException("Unwind"));
#pragma warning restore CA1303 // Do not pass literals as localized parameters
var ex = await Assert.ThrowsAsync <AggregateException>(() => runTask).ConfigureAwait(false);
Assert.Equal("Unwind", Assert.Single(ex.Flatten().InnerExceptions).Message);
}
public async Task StartAndStopUnderHosting()
{
// arrange
var latches = new TestLatches();
using var host = new HostBuilder()
.ConfigureServices((hbc, services) =>
{
services.AddSingleton <IHostedService, FakeBackgroundHostedService>();
services.AddSingleton(latches);
})
.Build();
// act
using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(15));
await host.StartAsync(cts.Token).ConfigureAwait(false);
await latches.RunEnter.WhenSignalAsync(cts.Token).ConfigureAwait(false);
latches.RunResult.Signal();
await latches.RunExit.WhenSignalAsync(cts.Token).ConfigureAwait(false);
await host.StopAsync(cts.Token).ConfigureAwait(false);
// assert
}
public async Task StartAndStopUnderWebHost()
{
var latches = new TestLatches();
using var host = new WebHostBuilder()
.ConfigureServices((hbc, services) =>
{
services.AddSingleton <IServer, FakeServer>();
services.AddSingleton <IHostedService, FakeBackgroundHostedService>();
services.AddSingleton(latches);
})
.Configure(app => { })
.Build();
// TODO: figure out why the hosting takes so long to unwind naturally
// and increase this safety cancellation up from 3 seconds
using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(3));
var runTask = host.RunAsync(cts.Token);
await latches.RunEnter.WhenSignalAsync(cts.Token).ConfigureAwait(false);
latches.RunResult.Signal();
await latches.RunExit.WhenSignalAsync(cts.Token).ConfigureAwait(false);
await runTask.ConfigureAwait(false);
}
public FakeBackgroundHostedService(
TestLatches context,
IHostApplicationLifetime hostApplicationLifetime)
: base(hostApplicationLifetime, null)
{
_context = context;
}
