private void When_buffer_overflows_it_must_raise_error_event()
{
// Arrange
const string directoryToWatch = @"c:\some";
string pathToFileToUpdate = Path.Combine(directoryToWatch, "file.txt");
FakeFileSystem fileSystem = new FakeFileSystemBuilder()
.IncludingEmptyFile(pathToFileToUpdate)
.Build();
DateTime startTime = DateTime.UtcNow;
var lockObject = new object();
ErrorEventArgs firstErrorArgs = null;
using (FakeFileSystemWatcher watcher = fileSystem.ConstructFileSystemWatcher(directoryToWatch))
{
watcher.NotifyFilter = TestNotifyFilters.All;
watcher.InternalBufferSize = 1;
watcher.Changed += (sender, args) => { Thread.Sleep(100); };
watcher.Error += (sender, args) =>
{
lock (lockObject)
{
if (firstErrorArgs == null)
{
firstErrorArgs = args;
}
}
};
watcher.EnableRaisingEvents = true;
// Act
while (startTime.AddMilliseconds(MaxTestDurationInMilliseconds) > DateTime.UtcNow)
{
fileSystem.File.SetCreationTimeUtc(pathToFileToUpdate, 1.January(2001));
lock (lockObject)
{
if (firstErrorArgs != null)
{
break;
}
}
}
lock (lockObject)
{
// Assert
firstErrorArgs.Should().NotBeNull();
Exception exception = firstErrorArgs.GetException();
exception.Should().BeOfType <InternalBufferOverflowException>()
.Subject.Message.Should().Be(@"Too many changes at once in directory:c:\some.");
}
}
}
