Add tests for win_stat module.

windows/win_stat

@@ -27,7 +27,8 @@ description:
 options:
   path:
     description:
-      - The full path of the file/object to get the facts of
+      - The full path of the file/object to get the facts of; both forward and
+        back slashes are accepted.
     required: true
     default: null
     aliases: []

windows/win_stat.ps1

@@ -19,16 +19,20 @@
 
 $params = Parse-Args $args;
 
-$path = '';
+$path = $FALSE;
 If ($params.path.GetType)
 {
    $path = $params.path;
 }
+If ($path -eq $FALSE)
+{
+    Fail-Json (New-Object psobject) "missing required argument: path";
+}
 
 $get_md5 = $TRUE;
 If ($params.get_md5.GetType)
 {
-    $get_md5 = $params.get_md5;
+    $get_md5 = $params.get_md5 | ConvertTo-Bool;
 }
 
 $result = New-Object psobject @{