update script in Test Centre to create more varied test images.

The images are saved in LoadingTestArea and use async.

TestCentre/Script.fsx

@@ -8,6 +8,7 @@ open System.Reflection
 open SmoulderingBeachBall.Domain
 open SmoulderingBeachBall.Services
 open System.Threading
+open System.Threading
 
 (* Populating LoadingTestArea Folder Scripts
 ===============================================================================
@@ -18,6 +19,8 @@ and saving them in SavingTestArea. *)
 
 let saveLocation = __SOURCE_DIRECTORY__ + "/LoadingTestArea"
 
+let random = Random()
+
 let allColours =
     let properties =
         typeof<Brushes>.GetProperties(BindingFlags.Public ||| BindingFlags.Static)
@@ -25,20 +28,27 @@ let allColours =
     |> Seq.toArray
 
 let randomBrush () =
-    let item = allColours.[Random().Next(allColours.Length)]
+    let item = allColours.[random.Next(allColours.Length)]
     item.GetValue(null, null)
 
-let populateSpec () =
-    { width = (Random().Next(3000))
-      height = (Random().Next(3000))
+let generateDimensionSizes total =
+    List.init total  (fun _ -> random.Next(3000))
+
+let randomSize (sizes: int list) =
+    // (Sleep) Helps to reduce chance of picking the same item twice in quick succession.
+    Thread.Sleep 100
+    sizes.Item (random.Next(sizes.Length))
+
+let populateSpec sizes =
+    { width = randomSize (sizes)
+      height = randomSize (sizes)
       colour = (randomBrush ()) :?> Brush
       filePath = saveLocation
       overlay = None }
 
 let generateSpecs amount =
-    [for i in 1 .. amount do
-        Thread.Sleep 500
-        yield (populateSpec ()) ] 
+    let imageSizes = generateDimensionSizes amount
+    [for i in 0 .. amount -> (populateSpec (imageSizes)) ] 
 
 let generateImage spec =
     printfn "[INFO.] Creating image [Width: %i] [Height: %i] ..." (spec.width) (spec.height)
@@ -46,10 +56,13 @@ let generateImage spec =
 
 let populateLoadingTestArea () =
     printfn "[INFO.] Populating LoadingTestArea..."
-    for spec in generateSpecs 100 do
-        generateImage spec
-        |> Async.RunSynchronously
+    generateSpecs 100
+    |> List.map generateImage
+    |> Async.Parallel
+    |> Async.RunSynchronously
+    |> ignore
     printfn "[INFO.] Finishing populating /LoadingTestArea."
 
-// You should only need this once you have passed the above into F# Interactive.
+// You should only need this once.
+// Make sure you have passed the above into F# Interactive.
 populateLoadingTestArea ()