public async Task UpdateAsync_WithName_SendsMessageWithTracker()
{
// arrange
int id = 0;
string name = "Collen";
var service = new MockTrackerService();
service.Trackers.Add(new Tracker {
Id = 0, Name = "Bob"
});
var vm = new TrackerViewModel(service)
{
Id = 0,
Name = name
};
Tracker updatedTracker = null;
MessagingCenter.Subscribe <TrackerViewModel, Tracker>(this, nameof(vm.UpdateCommand),
(sender, tracker) => updatedTracker = tracker);
// act
await vm.UpdateAsync();
// assert
Assert.Equal(id, updatedTracker?.Id);
Assert.Equal(name, updatedTracker?.Name);
}
public async Task UpdateAsync_WithName_UpdatesTracker()
{
// arrange
int id = 0;
string name = "Collen";
var service = new MockTrackerService();
service.Trackers.Add(new Tracker {
Id = 0, Name = "Bob"
});
var vm = new TrackerViewModel(service)
{
Id = id,
Name = name
};
// act
await vm.UpdateAsync();
// assert
Assert.Single(vm.AllTrackers);
Assert.Contains(vm.AllTrackers, tracker => tracker.Name == name && tracker.Id == id);
}
public async Task UpdateAsync_NoName_HasError(string name)
{
// arrange
var vm = new TrackerViewModel(new MockTrackerService())
{
Id = 0,
Name = name
};
// act
await vm.UpdateAsync();
// assert
Assert.True(vm.HasError);
}
public async Task UpdateAsync_ServiceCallFailure_HasError()
{
// arrange
string name = "Collen";
var vm = new TrackerViewModel(new FailingTrackerService())
{
Id = 0,
Name = name
};
// act
await vm.UpdateAsync();
// assert
Assert.True(vm.HasError);
}
public async Task UpdateAsync_AnyError_DoesNotSendMessage(string name)
{
// arrange
var vm = new TrackerViewModel(new FailingTrackerService())
{
Id = 0,
Name = name
};
bool messageSent = false;
MessagingCenter.Subscribe <TrackerViewModel, Tracker>(this, nameof(vm.UpdateCommand),
(sender, tracker) => messageSent = true);
// act
await vm.UpdateAsync();
// assert
Assert.False(messageSent);
}
public async Task UpdateAsync_WithName_HasNoError(string name)
{
// arrange
var service = new MockTrackerService();
service.Trackers.Add(new Tracker {
Id = 0, Name = "Bob"
});
var vm = new TrackerViewModel(service)
{
Id = 0,
Name = name
};
// act
await vm.UpdateAsync();
// assert
Assert.False(vm.HasError);
}