diff --git a/core/coverage.sh b/core/coverage.sh
index 74f9f4219d..b3c2e96eed 100755
--- a/core/coverage.sh
+++ b/core/coverage.sh
@@ -99,6 +99,7 @@ for test in `ls ${DIR_UNITTEST}`; do
     if [ $? -ne 0 ]; then
         echo ${args}
         echo ${DIR_UNITTEST}/${test} "run failed"
+        exit -1
     fi
 done
 
@@ -123,6 +124,10 @@ ${LCOV_CMD} -r "${FILE_INFO_OUTPUT}" -o "${FILE_INFO_OUTPUT_NEW}" \
     "*/src/server/grpc_impl/GrpcServer.cpp" \
     "*/src/utils/easylogging++.h" \
     "*/src/utils/easylogging++.cc"
+if [ $? -ne 0 ]; then
+    echo "generate ${FILE_INFO_OUTPUT_NEW} failed"
+    exit -2
+fi
 
 # gen html report
 ${LCOV_GEN_CMD} "${FILE_INFO_OUTPUT_NEW}" --output-directory ${DIR_LCOV_OUTPUT}/