public void FindLongOperationTest()
{
// Arrange.
var operationId = new Guid("{A9795BAF-22FD-42D6-9B31-7B5BF5AC3254}");
var vm = new MainViewModel();
// Act.
var foundOperation = vm.FindLongOperation(operationId);
// Assert.
Assert.IsNull(foundOperation);
// Add operation.
var operation = vm.FindOrCreateLongOperation(operationId);
// Act.
foundOperation = vm.FindLongOperation(operationId);
// Assert.
Assert.AreSame(operation, foundOperation);
}
