diff --git a/admob/testapp/gradle.properties b/admob/testapp/gradle.properties
new file mode 100644
index 00000000..56640573
--- /dev/null
+++ b/admob/testapp/gradle.properties
@@ -0,0 +1,6 @@
+# Android X
+android.enableJetifier=true
+android.useAndroidX=true
+
+# firebase c++ sdk
+systemProp.firebase_cpp_sdk.dir=full-path-to-SDK
\ No newline at end of file