public void ShouldHandleMultipleAsyncBusy()
{
const int shortDelay = 1000;
const int longDelay = 2000;
var vm = new TestViewModel();
vm.IsBusy.Should().BeFalse();
vm.IsNotBusy.Should().BeTrue();
Task.Run(async() =>
{
using (vm.Busy())
{
vm.IsBusy.Should().BeTrue();
await Task.Delay(shortDelay);
}
vm.IsBusy.Should().BeTrue(because: "because the second method runs longer.");
});
Task.Run(async() =>
{
using (vm.Busy())
{
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
await Task.Delay(longDelay);
}
vm.IsBusy.Should().BeFalse();
});
vm.IsBusy.Should().BeFalse();
vm.IsNotBusy.Should().BeTrue();
}
public void ShouldManageMultipleBusy()
{
const int expectedChangeCount = 2; // one for IsBusy and one for IsNotBusy
var propertyChangedCount = 0;
var vm = new TestViewModel();
vm.PropertyChanged += (sender, args) => propertyChangedCount++;
vm.IsBusy.Should().BeFalse();
vm.IsNotBusy.Should().BeTrue();
using (vm.SuppressChangeNotifications())
using (vm.Busy())
{
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
using (vm.Busy())
{
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
}
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
}
vm.IsBusy.Should().BeFalse();
vm.IsNotBusy.Should().BeTrue();
propertyChangedCount.Should().Be(expectedChangeCount);
}
public void ShouldManageMultipleBusyWithDirectSetAndOnlyRaiseTwoPropertyChanges()
{
var propertyChangedCount = 0;
const int expectedRaiseCount = 2; // one for busy and one for not busy
var vm = new TestViewModel();
vm.PropertyChanged += (sender, args) => propertyChangedCount++;
using (vm.SuppressChangeNotifications())
{
vm.IsBusy.Should().BeFalse();
vm.IsNotBusy.Should().BeTrue();
vm.IsBusy = true;
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
using (vm.Busy())
{
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
using (vm.Busy())
{
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
using (vm.Busy())
{
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
using (vm.Busy())
{
vm.IsBusy = false;
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
using (vm.Busy())
{
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
}
}
}
}
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
}
vm.IsBusy.Should().BeFalse();
vm.IsNotBusy.Should().BeTrue();
vm.IsBusy = true;
vm.IsBusy.Should().BeTrue();
vm.IsNotBusy.Should().BeFalse();
vm.IsBusy = false;
vm.IsBusy.Should().BeFalse();
vm.IsNotBusy.Should().BeTrue();
}
propertyChangedCount.Should().Be(expectedRaiseCount);
}