Merge "Add the test name that is too long for diagnosing issues."

Author: Nicolas Geoffray

test/etc/run-test-jar

@@ -505,7 +505,8 @@ fi
 DEX_LOCATION_STRIPPED="${DEX_LOCATION#/}"
 VDEX_NAME="${DEX_LOCATION_STRIPPED//\//@}@$TEST_NAME.jar@classes.vdex"
 if [ ${#VDEX_NAME} -gt $max_filename_size ]; then
-    echo  "Dex location path too long."
+    echo "Dex location path too long:"
+    echo "$VDEX_NAME is ${#VDEX_NAME} character long, and the limit is $max_filename_size."
     exit 1
 fi