diff --git a/lib/before-build-task-args.ts b/lib/before-build-task-args.ts
new file mode 100644
index 0000000..bcdb893
--- /dev/null
+++ b/lib/before-build-task-args.ts
@@ -0,0 +1,8 @@
+
+module.exports = function (hookArgs, $options) {
+    if(!hookArgs || !hookArgs.args) {
+        return;
+    }
+    const unitTesting = $options && $options.env && $options.env.unitTesting || false;
+    hookArgs.args.push(`-PunitTesting=${!!unitTesting}`);
+};
diff --git a/package.json b/package.json
index 49cd84c..5f433ea 100644
--- a/package.json
+++ b/package.json
@@ -39,6 +39,11 @@
         "type": "before-liveSync",
         "script": "lib/before-liveSync.js",
         "inject": true
+      },
+      {
+        "type": "before-build-task-args",
+        "script": "lib/before-build-task-args.js",
+        "inject": true
       }
     ]
   },