System.Threading.Tests.AsyncLocalTests.ExecutionContextCopyOnWrite C# (CSharp) Method

        public static async Task ExecutionContextCopyOnWrite()
        {
            AsyncLocal<int> local = new AsyncLocal<int>();

            local.Value = 42;

            await Run(async () =>
                {
                    SynchronizationContext.SetSynchronizationContext(new SynchronizationContext());
                    Assert.Equal(42, local.Value);
                    local.Value = 12;
                });

            Assert.Equal(local.Value, 42);
        }