adf-testing package (#4152)

* add new lib adf-testing

* fix the prefix

* Improve package

* Add testing project

* remove useless stuff

* Remove useless code

tsconfig.json

@@ -18,7 +18,15 @@
     "lib": [
       "es2018",
       "dom"
-    ]
+    ],
+    "paths": {
+      "testing": [
+        "dist/testing"
+      ],
+      "testing/*": [
+        "dist/testing/*"
+      ]
+    }
   },
   "exclude": [
     "lib/config",
@@ -28,4 +36,4 @@
     "tools",
     "node_modules"
   ]
-}
+}