Build: make sure failing tests actually fail the build target

Author: cdrnet

build/Testing.fs

@@ -7,8 +7,10 @@ open Fake.DotNet
 
 let test testsDir testsProj framework =
     //DotNet.test (withWorkingDirectory testsDir >> (fun o -> { o with Framework = Some framework; NoRestore = true; NoBuild = true; Configuration = DotNet.BuildConfiguration.Release })) testsProj
-    DotNet.exec
-        (fun c -> { c with WorkingDirectory = testsDir })
-        (sprintf "run --project %s --configuration Release --framework %s --no-restore --no-build" testsProj framework)
-        ""
-        |> ignore<ProcessResult>
+    let result =
+        DotNet.exec
+            (fun c -> { c with WorkingDirectory = testsDir })
+            (sprintf "run --project %s --configuration Release --framework %s --no-restore --no-build" testsProj framework)
+            ""
+    if not result.OK then failwithf "Tests Failed: %A" result
+