static void TestWatchNonexistantFile()
{
WithTempFile(path => {
try { File.Delete(path); } catch (IOException) { Inconclusive("Should've deleted temp file"); return; }
try {
Watch.FileLines(path, text => {}, error => {});
Fail("Watch.FileLines(nonexistant, ...) should invoke only the error delegate");
}
catch (FileNotFoundException) {}
});
}
static void TestWatchExistingFile_ThenDelete()
{
WithTempFile(path => {
var lines = RandomLines(PRNG);
var result = new TaskCompletionSource <string[]>();
var errResult = new TaskCompletionSource <Exception>();
File.WriteAllLines(path, lines);
Watch.FileLines(path,
read => result.SetResult(read.ToArray()),
error => errResult.SetResult(error));
Assert(EqualStringArrays(result.Task.Result, lines), "Watch.FileLines(existant, ...) should invoke the text delegate once");
// Now delete
try { File.Delete(path); } catch (IOException) { Inconclusive("Should've deleted temp file"); return; }
var errTask = errResult.Task;
Assert(errTask.Wait(1000) && (errTask.Result is FileNotFoundException), "Watch.FileLines(nonexistant, ...) should invoke only the error delegate");
});
}
static void TestWatchMutatingFile()
{
WithTempFile(path => {
var finalLines = RandomLines(PRNG);
var lines = RandomLines(PRNG);
var result = new TaskCompletionSource <bool>();
File.WriteAllLines(path, lines);
Watch.FileLines(path,
read => { if (EqualStringArrays(read.ToArray(), finalLines))
{
result.SetResult(true);
}
},
error => { if (!(error is IOException))
{
result.SetResult(false);
}
}); // Highly contested files are likely to throw IOException s.
// Stress
for (var i = 0; i < 100; ++i)
{
try { File.WriteAllLines(path, RandomLines(PRNG)); } catch (IOException) { }
}
Thread.Sleep(10);
for (var i = 0; i < 100; ++i)
{
try { File.WriteAllLines(path, RandomLines(PRNG)); } catch (IOException) { }
}
for (;;)
{
try { File.WriteAllLines(path, finalLines); break; } catch (IOException) { }
}
Assert(result.Task.Wait(1000) && result.Task.Result, "Watch.FileLines(existant, ...) should have ended up with the right final result.");
});
}