Precommit hook added to Settings, preventing the creation of new Robolectric tests.

Test: repo upload .
Change-Id: If31d79a7bf6a18f4c52692ffab4981056c14eaba

tests/robotests/new_tests_hook.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# This script detects the presence of new robolectric java tests within
+# commits to be uploaded. If a new file is detected the script will print an
+# error message and return an error code. Intended to be used as a repo hook.
+
+new_robolectric_tests=$(
+    git diff --name-status $REPO_LREV | grep "^A.*tests/robotests.*\.java")
+if [ $new_robolectric_tests != "" ]
+then
+    echo "New Robolectric unit tests detected. Please submit junit tests" \
+    "instead, in the tests/junit directory." \
+    "See go/android-platform-robolectric-cleanup."
+    echo $new_robolectric_tests
+    exit 1
+fi