Wait until all Task finish in unit test

Question

I have this class I want to unit test:

public class SomeClass
{
    public void Foo()
    {
        Bar();
    }

    private void Bar()
    {
        Task.F         


        

Answer 1

Not sure if you are allowed to make this change but I got it to work doing this:

namespace ParallelProgramming.Playground
{
    public class SomeClass
    {
        public Task Foo()
        {
            return Bar();
        }

        private static Task Bar()
        {
            return Task.Factory.StartNew(() =>
                {
                    Console.WriteLine("I fired off. Thread ID: {0}", Thread.CurrentThread.ManagedThreadId);
                    Thread.Sleep(5000);
                    return true; //or whatever else you want.
                });
        }
    }

    [TestClass]
    public class StackOverflow
    {
        [TestMethod]
        public void TestFoo()
        {
            // Arrange
            var obj = new SomeClass();

            var results = new ConcurrentBag(); 
            var waitForMe = Task.Factory.StartNew(() =>
                {
                    // Act
                    results.Add(obj.Foo());
                    results.Add(obj.Foo());
                    results.Add(obj.Foo());

                    return true;
                });


            Task.WaitAll(waitForMe);

            // Assert
            /* I need something to wait on all tasks to finish */
            Assert.IsTrue(waitForMe.Result);
            Assert.AreEqual(3, results.Count);
        }
    }
}