diff --git a/src/FSharpy.TaskSeq.Test/TaskSeq.AllTests.fs b/src/FSharpy.TaskSeq.Test/TaskSeq.AllTests.fs
index a20f65f..f4573b1 100644
--- a/src/FSharpy.TaskSeq.Test/TaskSeq.AllTests.fs
+++ b/src/FSharpy.TaskSeq.Test/TaskSeq.AllTests.fs
@@ -13,9 +13,7 @@ open Xunit.Abstractions
 
 
 type AllTests(output: ITestOutputHelper) =
-
-    [<Fact>]
-    let ``Run all tests`` () =
+    let createParallelRunner () =
         let myAsm = Assembly.GetExecutingAssembly()
 
         let allMethods = [
@@ -28,13 +26,7 @@ type AllTests(output: ITestOutputHelper) =
                     | _ -> ()
         ]
 
-        let x =
-            { new System.IFormattable with
-                member x.ToString(format: string, provider: System.IFormatProvider) =
-                    if format = "D" then "foo" else "bar"
-            }
-
-        task {
+        let all = seq {
             for (ty, method) in allMethods do
                 let ctor = ty.GetConstructor [| typeof<ITestOutputHelper> |]
 
@@ -43,14 +35,119 @@ type AllTests(output: ITestOutputHelper) =
 
                 let testObj = ctor.Invoke([| output |])
 
-                let! _ =
-                    if method.ReturnType.Name.Contains "Task" then
-                        method.Invoke(testObj, null) :?> Task<unit>
-                    else
-                        method.Invoke(testObj, null) |> ignore
-                        task { return () }
+                if method.ReturnType.Name.Contains "Task" then
+                    //task {
+                    //    let! x = Async.StartChildAsTask (Async.ofTask (method.Invoke(testObj, null) :?> Task<unit>))
+                    //    return! x
+                    //}
+                    async {
+                        return!
+                            method.Invoke(testObj, null) :?> Task<unit>
+                            |> Async.AwaitTask
+                    }
+                else
+                    async { return method.Invoke(testObj, null) |> ignore }
+        }
 
-                ()
+        all |> Async.Parallel |> Async.map ignore
 
-            return ()
+    let multiply f x =
+        seq {
+            for i in [ 0..x ] do
+                yield f ()
         }
+        |> Async.Parallel
+        |> Async.map ignore
+
+    [<Fact>]
+    let ``Run all tests 1 times in parallel`` () = task { do! multiply createParallelRunner 1 }
+
+    [<Theory>]
+    [<InlineData 1; InlineData 2; InlineData 3; InlineData 4; InlineData 5; InlineData 6; InlineData 7; InlineData 8>]
+    let ``Run all tests X times in parallel`` i = task { do! multiply createParallelRunner i }
+
+    [<Theory>]
+    [<InlineData 1; InlineData 2; InlineData 3; InlineData 4; InlineData 5; InlineData 6; InlineData 7; InlineData 8>]
+    let ``Run all tests again X times in parallel`` i = task { do! multiply createParallelRunner i }
+
+    [<Theory>]
+    [<InlineData 1; InlineData 2; InlineData 3; InlineData 4; InlineData 5; InlineData 6; InlineData 7; InlineData 8>]
+    let ``Run all tests and once more, X times in parallel`` i = task { do! multiply createParallelRunner i }
+
+
+//[<Fact>]
+//let ``Run all tests 3 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 4 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 5 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 6 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 7 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 8 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 9 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 10 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 11 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 12 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 13 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 14 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously
+
+
+//[<Fact>]
+//let ``Run all tests 15 times in parallel`` () =
+//    multiply createParallelRunner 15
+//    |> Async.RunSynchronously