using System.Threading.Tasks;
using NUnit.Framework;
using ShareeBike.ViewModel;

namespace SharedBusinessLogic.Tests.Fixtures.ObjectTests
{
	[TestFixture]
	public class TestPollingUpdateTask
	{
		/// <summary>
		/// Verify that no exception is thrown when invoking Terminate.
		/// </summary>
		[Test]
		public async Task TestCtorPollingOff()
		{
			var task = new PollingUpdateTask(() => throw new System.Exception("This must not be called."), null);

			await task.Terminate();
		}

		[Test]
		public async Task TestCtorPollingOn()
		{
			int index = 0;
			var task = new PollingUpdateTask(() => index++, new System.TimeSpan(10));

			System.Threading.SpinWait.SpinUntil(() => index > 2);

			await task.Terminate();

			Assert.That(index, Is.AtLeast(3), "Delegate which increments index must be called.");
		}

		[Test]
		public void TestTerminateRepeated()
		{
			var tasks = new PollingUpdateTask(async () => await Task.Delay(1000), new System.TimeSpan(0, 0, 2));

			tasks.Terminate().Wait();

			// Verify that calling terminate twice does not lead to hang of call.
			tasks.Terminate().Wait();
		}
	}
}