public void TestDeadlockWhenRemovingAnActiveDataSource()
{
var logFile = new Mock <ILogSource>();
var dataSource = new Mock <IDataSource>();
dataSource.Setup(x => x.UnfilteredLogSource).Returns(logFile.Object);
var collection = new BookmarkCollection(_bookmarks.Object, TimeSpan.Zero);
logFile.Setup(x => x.RemoveListener(It.IsAny <ILogSourceListener>()))
.Callback((ILogSourceListener unused) =>
{
// In order to produce the deadlock, we have to simulate what's happening in reality.
// Any ILogFile implementation will hold a lock both while invoking listeners and while
// Removing them. Waiting on the OnLogFileModified() call simulates exactly that...
var task = new Task(() =>
{
collection.OnLogFileModified(logFile.Object, LogSourceModification.Removed(0, 10));
}, TaskCreationOptions.LongRunning);
task.Start();
task.Wait();
});
collection.AddDataSource(dataSource.Object);
var removeTask = Task.Factory.StartNew(() => collection.RemoveDataSource(dataSource.Object));
removeTask.Wait(TimeSpan.FromSeconds(1)).Should().BeTrue("because RemoveDataSource should not block at all");
logFile.Verify(x => x.RemoveListener(collection), Times.Once);
}
