Move test resources out from firebase-messaging (#3574)

* Move test resources out from firebase-messaging

* move string

* Formatting

Author: carlonzo

firebase-messaging/src/main/res/values/strings.xml

@@ -1,7 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string name="fcm_fallback_notification_channel_label">Miscellaneous</string>
-    <string name="fcm_no_args">String with no arguments</string>
-    <string name="fcm_2_args">First: %1$s and second %2$s</string>
-    <color name="fcm_test_color">#4285F4</color>
-</resources>
+</resources>

firebase-messaging/src/test/java/com/google/firebase/messaging/ImageDownloadRoboTest.java

@@ -22,6 +22,7 @@
 import com.google.android.gms.tasks.Task;
 import com.google.android.gms.tasks.Tasks;
 import com.google.firebase.messaging.shadows.ShadowPreconditions;
+import com.google.firebase.messaging.test.R;
 import com.google.firebase.messaging.testing.TestImageServer;
 import java.io.IOException;
 import java.util.Arrays;

firebase-messaging/src/main/res/drawable-v26/adaptive_icon.xml renamed to firebase-messaging/src/test/res/drawable-v26/adaptive_icon.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="fcm_no_args">String with no arguments</string>
+    <string name="fcm_2_args">First: %1$s and second %2$s</string>
+    <color name="fcm_test_color">#4285F4</color>
+</resources>