diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 4c9ea0406a0..eda772c4048 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -39,7 +39,7 @@ jobs:
         run: mkdir -p build
       - name: CMake with gcc
         if: matrix.compiler == 'gcc'
-        run: cd build && cmake ..
+        run: cd build && cmake -DENABLE_COVERAGE=ON ..
       - name: CMake with clang
         if: matrix.compiler == 'clang'
         run: cd build && cmake -DCMAKE_CXX_COMPILER=clang++-8 -DCMAKE_C_COMPILER=clang-8 -DENABLE_ASAN=on -DNEBULA_CLANG_USE_GCC_TOOLCHAIN=/opt/vesoft/toolset/gcc/7.5.0 ..
@@ -48,3 +48,12 @@ jobs:
       - name: CTest with single thread
         timeout-minutes: 40
         run: cd build && ASAN_SYMBOLIZER_PATH=/usr/bin/llvm-symbolizer ASAN_OPTIONS=fast_unwind_on_malloc=0 ctest --timeout 300 --output-on-failure
+      - name: Coverage Report
+        if: success() && matrix.compiler == 'gcc' && matrix.tag == 'centos7'
+        run: cd build && lcov --gcov-tool $GCOV --capture --directory . --output-file coverage.info
+      - name: Coveralls
+        if: success() && matrix.compiler == 'gcc' && matrix.tag == 'centos7'
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: build/coverage.info
diff --git a/.github/workflows/pull_request.yaml b/.github/workflows/pull_request.yaml
index d363b02d3e9..3bb8b488db1 100644
--- a/.github/workflows/pull_request.yaml
+++ b/.github/workflows/pull_request.yaml
@@ -55,7 +55,7 @@ jobs:
           [ -d build/ ] && rm -rf build/* || mkdir -p build
       - name: CMake with gcc
         if: matrix.compiler == 'gcc' && steps.ignore_docs.outputs.num_source_files != 0
-        run: cd build && cmake ..
+        run: cd build && cmake -DENABLE_COVERAGE=ON ..
       - name: CMake with clang
         if: matrix.compiler == 'clang' && steps.ignore_docs.outputs.num_source_files != 0
         run: cd build && cmake -DCMAKE_CXX_COMPILER=clang++-8 -DCMAKE_C_COMPILER=clang-8 -DENABLE_ASAN=on -DNEBULA_CLANG_USE_GCC_TOOLCHAIN=/opt/vesoft/toolset/gcc/7.5.0 ..
@@ -70,6 +70,19 @@ jobs:
         if: failure() && steps.ignore_docs.outputs.num_source_files != 0
         timeout-minutes: 30
         run: cd build && ASAN_SYMBOLIZER_PATH=/usr/bin/llvm-symbolizer ASAN_OPTIONS=fast_unwind_on_malloc=0 ctest --timeout 300 --output-on-failure --rerun-failed
+      - name: Coverage Report
+        if: success() && matrix.compiler == 'gcc' && matrix.tag == 'centos7'
+        run: |
+          cd build && lcov --gcov-tool $GCOV --capture --directory . --output-file coverage.info
+          stat coverage.info
+      - name: Coveralls
+        if: success() && matrix.compiler == 'gcc' && matrix.tag == 'centos7'
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: build/coverage.info
+        env:
+          NODE_OPTIONS: --max-old-space-size=20480
       - name: Cleanup
         if: always()
         run: rm -rf build
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 66a4fbf7f09..af93d7a7fdc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,6 +43,7 @@ option(ENABLE_NATIVE "Whether to build native client" OFF)
 option(ENABLE_CCACHE "Whether to use ccache to speed up compiling" ON)
 option(ENABLE_ASAN "Whether to turn AddressSanitizer ON or OFF" OFF)
 option(ENABLE_TESTING "Whether to turn unit test ON or OFF" ON)
+option(ENABLE_COVERAGE "Enable testing coverage reporting" OFF)
 option(ENABLE_UBSAN "Whether to turn Undefined Behavior Sanitizer ON or OFF" OFF)
 option(ENABLE_FUZZ_TEST "Whether to turn Fuzz Test ON or OFF" OFF)
 option(ENABLE_WERROR "Whether to error on warnings" ON)
@@ -66,6 +67,13 @@ if (!CMAKE_CXX_COMPILER)
     message(FATAL_ERROR "No C++ compiler found")
 endif()
 
+if(ENABLE_TESTING AND ENABLE_COVERAGE AND CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+  # Add required flags (GCC & LLVM/Clang)
+  add_compile_options(
+    --coverage # sets all required flags
+  )
+endif()
+
 set(CMAKE_CXX_STANDARD 14)  # specify the C++ standard
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
@@ -453,6 +461,12 @@ else()
     set(GETTIME_LIB)
 endif()
 
+if (ENABLE_TESTING AND ENABLE_COVERAGE)
+    set(COVERAGE --coverage)
+else()
+    set(COVERAGE)
+endif()
+
 # A wrapper for target_link_libraries()
 macro(nebula_link_libraries target)
     target_link_libraries(
@@ -477,6 +491,7 @@ macro(nebula_link_libraries target)
         dl
         ${GETTIME_LIB}
         -pthread
+        ${COVERAGE}
     )
 endmacro(nebula_link_libraries)
 
diff --git a/src/common/stats/StatsManager.cpp b/src/common/stats/StatsManager.cpp
index 3361a02cfbd..46165c39de7 100644
--- a/src/common/stats/StatsManager.cpp
+++ b/src/common/stats/StatsManager.cpp
@@ -129,7 +129,7 @@ StatusOr<StatsManager::VT> StatsManager::readValue(folly::StringPiece metricName
     }
 
     TimeRange range;
-    if ( parts[2] == "5") {
+    if (parts[2] == "5") {
         range = TimeRange::FIVE_SECONDS;
     } else if (parts[2] == "60") {
         range = TimeRange::ONE_MINUTE;
diff --git a/src/storage/BaseProcessor.inl b/src/storage/BaseProcessor.inl
index 2ab517b5e3e..5e415474623 100644
--- a/src/storage/BaseProcessor.inl
+++ b/src/storage/BaseProcessor.inl
@@ -125,7 +125,7 @@ BaseProcessor<RESP>::collectIndexValues(RowReader* reader,
     }
     return values;
 }
-    
+
 
 template <typename RESP>
 void BaseProcessor<RESP>::collectProps(RowReader* reader,
@@ -161,7 +161,7 @@ void BaseProcessor<RESP>::collectProps(RowReader* reader,
         }
     }
 }
-    
+
 
 }  // namespace storage
 }  // namespace nebula