public void WrapsIOExceptionsDuringWrite()
{
MockFileSystem fs = new MockFileSystem();
FileSystemTaskQueue dut = CreateFileBasedQueue(fs, Item1EntryText);
dut.IsEmpty.ShouldBeFalse();
fs.File.TruncateWrites = true;
Assert.Throws <FileBasedCollectionException>(() => dut.EnqueueAndFlush(Item2Payload));
fs.File.TruncateWrites = false;
fs.File.ReadAt(fs.File.Length - 2, 2).ShouldNotEqual("\r\n", "Bad Test: The file is supposed to be corrupt.");
string error;
FileSystemTaskQueue.TryCreate(null, MockEntryFileName, fs, out dut, out error).ShouldEqual(true);
dut.IsEmpty.ShouldBeFalse();
using (dut)
{
FileSystemTask output;
dut.TryPeek(out output).ShouldEqual(true);
output.ShouldEqual(Item1Payload);
dut.DequeueAndFlush(output);
}
dut.IsEmpty.ShouldBeTrue();
}
public void StoresDeleteRecord()
{
const string DeleteRecord = "D 1\r\n";
MockFileSystem fs = new MockFileSystem();
FileSystemTaskQueue dut = CreateFileBasedQueue(fs, Item1EntryText);
dut.IsEmpty.ShouldBeFalse();
// Add a second entry to keep FileBasedQueue from setting the stream length to 0
dut.EnqueueAndFlush(Item2Payload);
dut.IsEmpty.ShouldBeFalse();
fs.File.ReadAsString().ShouldEqual(Item1EntryText + Item2EntryText);
fs.File.ReadAt(fs.File.Length - 2, 2).ShouldEqual("\r\n");
dut.DequeueAndFlush(Item1Payload);
dut.IsEmpty.ShouldBeFalse();
dut.Count.ShouldEqual(1);
FileSystemTask item;
dut.TryPeek(out item).ShouldEqual(true);
item.ShouldEqual(Item2Payload);
dut.IsEmpty.ShouldBeFalse();
dut.Count.ShouldEqual(1);
fs.File.Length.ShouldEqual(Encoding.UTF8.GetByteCount(Item1EntryText) + Item2EntryText.Length + DeleteRecord.Length);
fs.File.ReadAt(Encoding.UTF8.GetByteCount(Item1EntryText) + Item2EntryText.Length, DeleteRecord.Length).ShouldEqual(DeleteRecord);
}