fixed command execute async test not testing anything.

fixed command execute async not returning stdout content.

src/Fli.Tests/ExecContext/ExecCommandExecuteTests.fs

@@ -107,9 +107,9 @@ let ``Hello World with executing program async`` () =
 
             output |> Output.toText |> should equal "Hello World!"
         }
-        |> Async.Start
     else
         Assert.Pass()
+        |> async.Return
 
 [<Test>]
 let ``Hello World with executing program with Verb`` () =

src/Fli.Tests/ShellContext/ShellCommandExecuteTests.fs

@@ -231,9 +231,9 @@ let ``Hello World with BASH async`` () =
 
             output |> Output.toText |> should equal "Hello World!"
         }
-        |> Async.Start
     else
         Assert.Pass()
+        |> async.Return 
 
 [<Test>]
 let ``BASH returning non zero ExitCode`` () =

src/Fli/Command.fs

@@ -48,29 +48,14 @@ module Command =
             let proc = Process.Start(startInfo = psi)
             do! proc |> inFunc |> Async.AwaitTask
 
-            let sbStd = StringBuilder()
-            let sbErr = StringBuilder()
-
-            proc.OutputDataReceived.AddHandler(
-                new DataReceivedEventHandler(fun s e ->
-                    use o = proc.StandardOutput
-                    sbStd.Append(o.ReadToEnd()) |> ignore)
-            )
-
-            proc.ErrorDataReceived.AddHandler(
-                new DataReceivedEventHandler(fun s e ->
-                    use o = proc.StandardError
-                    sbErr.Append(o.ReadToEnd()) |> ignore)
-            )
-
-            let text = sbStd.ToString()
-            let error = sbErr.ToString()
-
             try
                 do! proc.WaitForExitAsync(cancellationToken) |> Async.AwaitTask
             with :? OperationCanceledException ->
                 ()
 
+            let! text = proc.StandardOutput.ReadToEndAsync() |> Async.AwaitTask
+            let! error = proc.StandardError.ReadToEndAsync() |> Async.AwaitTask
+
             do text |> outFunc
 
             return