add property tests for functions which add a grid with the SkiaSharp based spec's.

TestCentre/LibraryTests.fs

@@ -21,6 +21,7 @@
         open System.Reflection
         open System.IO
         open DeathSocket.Domain
+        open SkiaSharp
 
         let rand = Random ()
 
@@ -42,7 +43,18 @@
 
         let randomBrush () =
             let item = allColours.[rand.Next(allColours.Length)]
-            item.GetValue(null, null)
+            item.GetValue (null, null)
+
+        let allSKColours =
+            let properties =
+                typeof<SKColors>.GetFields
+                    (BindingFlags.Static ||| BindingFlags.Public)
+            seq {for prop in properties -> prop}
+            |> Seq.toArray
+
+        let randomSKColour () =
+            let item = allSKColours.[rand.Next(allSKColours.Length)]
+            item.GetValue (null) :?> SKColor
 
         (* Max. value is arbitrary (change for performance).
         Min. value is to stop divide by zero exceptions.
@@ -93,6 +105,7 @@
         open DeathSocket.GridPainter
         open TestingHelpers
         open System.IO
+        open SkiaSharp
 
         (* With regards to the "saving images" tests, you should end up with
         one image left over in the SavingTestArea folder. Comment out the
@@ -104,14 +117,13 @@
             resetSavingTestArea ()
             let oPath = generateLoadPath ()
             let sPath = generateSavePath oPath
-            let (spec: BrushSpec) =
-                { originalPath = oPath
-                  savePath = sPath
-                  colour = randomBrush () :?> Brush
-                  penWidth = float32 (newPenWidth())
-                  rows = 10
-                  columns = 10 }
-            applyBrushSpecGridAsync spec
+            { originalPath = oPath
+              savePath = sPath
+              colour = randomBrush () :?> Brush
+              penWidth = float32 (newPenWidth())
+              rows = 10
+              columns = 10 }
+            |> applyBrushSpecGridAsync
             |> Async.RunSynchronously
             (File.Exists sPath) = true
 
@@ -120,17 +132,16 @@
             resetSavingTestArea ()
             let oPath = generateLoadPath ()
             let sPath = generateSavePath oPath
-            let (spec: RGBASpec) =
-                { originalPath = oPath
-                  savePath = sPath
-                  alpha = float (newRGBANum ())
-                  red = float (newRGBANum ())
-                  green = float (newRGBANum ())
-                  blue = float (newRGBANum ())
-                  penWidth = float32 (newPenWidth())
-                  rows = 10
-                  columns = 10 }
-            applyRGBAGridAsync spec
+            { originalPath = oPath
+              savePath = sPath
+              alpha = float (newRGBANum ())
+              red = float (newRGBANum ())
+              green = float (newRGBANum ())
+              blue = float (newRGBANum ())
+              penWidth = float32 (newPenWidth())
+              rows = 10
+              columns = 10 }
+            |> applyRGBAGridAsync
             |> Async.RunSynchronously
             (File.Exists sPath) = true
 
@@ -165,6 +176,38 @@
             let result = determineVerticalLines (newNum()) (newNum()) (newNum())
             result.Length > 0
 
+        [<Property>]
+        let ``Can apply grid to image and save it using SkiaSpec`` () =
+            resetSavingTestArea()
+            let oPath = generateLoadPath ()
+            let sPath = generateSavePath oPath
+            { originalPath = oPath
+              savePath= sPath
+              skColour = randomSKColour ()
+              penWidth = float32 (newPenWidth())
+              rows = newNum ()
+              columns = newNum () }
+            |> applySkiaGridAsync
+            |> Async.RunSynchronously
+            (File.Exists sPath) = true
+
+        [<Property>]
+        let ``Can apply grid to image and save it using SkiaRGBSpec`` () =
+            resetSavingTestArea()
+            let oPath = generateLoadPath ()
+            let sPath = generateSavePath oPath
+            { originalPath = oPath
+              savePath= sPath
+              red = float32 (newRGBANum ())
+              green = float32 (newRGBANum ())
+              blue = float32 (newRGBANum ())
+              penWidth = float32 (newPenWidth())
+              rows = newNum ()
+              columns = newNum () }
+            |> applySkiaRGBGridAsync
+            |> Async.RunSynchronously
+            (File.Exists sPath) = true
+
         [<Property>]
         let ``Can return a collection of SKPoints which represent a grids horizontal lines`` () =
             let result = determineSKHorizontalLines (newNum()) (newNum()) (newNum())