public async Task CreateAsync_WithName_HasNoError(string name)
{
// arrange
var vm = new TrackerViewModel(new MockTrackerService())
{
Name = name
};
// act
await vm.CreateAsync();
// assert
Assert.False(vm.HasError);
}
public async Task CreateAsync_ServiceCallFailure_HasError()
{
// arrange
string name = "Collen";
var vm = new TrackerViewModel(new FailingTrackerService())
{
Name = name
};
// act
await vm.CreateAsync();
// assert
Assert.True(vm.HasError);
}
public async Task CreateAsync_WithName_AddsToAllTrackers()
{
// arrange
string name = "Collen";
var vm = new TrackerViewModel(new MockTrackerService())
{
Name = name
};
// act
await vm.CreateAsync();
// assert
Assert.Contains(vm.AllTrackers, tracker => tracker.Name == name);
}
public async Task CreateAsync_AnyError_DoesNotSendMessage(string name)
{
// arrange
var vm = new TrackerViewModel(new FailingTrackerService())
{
Name = name
};
bool messageSent = false;
MessagingCenter.Subscribe <TrackerViewModel, Tracker>(this, nameof(vm.CreateCommand),
(sender, tracker) => messageSent = true);
// act
await vm.CreateAsync();
// assert
Assert.False(messageSent);
}
public async Task CreateAsync_WithName_SendsMessageWithTracker()
{
// arrange
string name = "Collen";
var vm = new TrackerViewModel(new MockTrackerService())
{
Name = name
};
Tracker createdTracker = null;
MessagingCenter.Subscribe <TrackerViewModel, Tracker>(this, nameof(vm.CreateCommand),
(sender, tracker) => createdTracker = tracker);
// act
await vm.CreateAsync();
// assert
Assert.Equal(name, createdTracker?.Name);
}