public async Task TraceToggling()
{
MockFolderPickerService folderPicker = new MockFolderPickerService(ApplicationData.Current.TemporaryFolder);
MockEventLogger logger = new MockEventLogger();
IDiagnosticTraceButtonViewModel vm = CreateViewModel(folderPicker, logger);
Assert.AreEqual(StartTraceLabel, vm.Label, "Initial ViewModel label should indicate tracing will start");
Assert.IsFalse(vm.IsTracing, "ViewModel should not be tracing initially");
Assert.IsFalse(logger.IsTracing, "Logger should not be tracing initially");
Assert.IsTrue(vm.Command.CanExecute(null), "ViewModel trace button should be enabled initially");
int eventsTraced = 0;
logger.EventTraced += (s, e) =>
{
eventsTraced++;
};
bool folderLaunched = false;
folderPicker.FolderLaunched += (s, e) =>
{
folderLaunched = true;
};
await vm.Command.ExecuteAsync(null);
Assert.AreEqual(StopTraceLabel, vm.Label, "ViewModel label after starting a trace should indicate tracing will stop");
Assert.IsTrue(vm.IsTracing, "ViewModel should be tracing after using the trace button");
Assert.IsTrue(logger.IsTracing, "Logger should be tracing after using the trace button");
Assert.AreEqual(1, eventsTraced, "Starting a trace should fire an event");
Assert.IsFalse(folderLaunched, "Folder should not be launched until tracing stops");
await vm.Command.ExecuteAsync(null);
Assert.AreEqual(StartTraceLabel, vm.Label, "ViewModel label after ending a trace should indicate tracing will start again");
Assert.IsFalse(vm.IsTracing, "ViewModel should not be tracing after using the trace button a second time");
Assert.IsFalse(logger.IsTracing, "Logger should not be tracing after using the trace button a second time");
Assert.AreEqual(2, eventsTraced, "Stopping a trace should fire a second event");
Assert.IsTrue(folderLaunched, "Folder should be launched once tracing stops");
}
/// <summary>
/// Initializes the ViewModel with the given dependencies.
/// </summary>
/// <param name="traceViewModel"></param>
public HelpViewModel(IDiagnosticTraceButtonViewModel traceViewModel)
{
this.traceViewModel = traceViewModel;
}
