Rejig test harness (#68)

WoofWare.PawPrint.Test/RealRuntime.fs

@@ -0,0 +1,18 @@
+namespace WoofWare.PawPrint.Test
+
+/// Result of executing the program using the real .NET runtime.
+type RealRuntimeResult =
+    {
+        ExitCode : int
+    }
+
+[<RequireQualifiedAccess>]
+module RealRuntime =
+    /// Execute an assembly using the real .NET runtime and capture the result.
+    let executeWithRealRuntime (args : string[]) (assemblyBytes : byte array) : RealRuntimeResult =
+        let assy = System.Reflection.Assembly.Load assemblyBytes
+        let result = assy.EntryPoint.Invoke ((null : obj), [| args |]) |> unbox<int>
+
+        {
+            ExitCode = result
+        }