diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 95dd8c98..13c496bb 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -11,22 +11,32 @@ on:
 
 jobs:
 
-  test-macos:
+  test:
     strategy:
       matrix:
-        os: [macos-latest, macos-12, macos-13]
+        os: [macos-latest, macos-12, macos-13, ubuntu-latest]
         llvm: [17]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
 
       - name: Update Homebrew
-        if: matrix.llvm == 17 # needed as long as LLVM 17 is still fresh
+        # needed as long as LLVM 17 is still fresh
+        if: matrix.llvm == 17 && startsWith(matrix.os, 'macos')
         run: brew update
       - name: Install LLVM ${{ matrix.llvm }} and bdw-gc
+        if: startsWith(matrix.os, 'macos')
         run: |
           HOMEBREW_NO_AUTO_UPDATE=1 brew install llvm@${{ matrix.llvm }} bdw-gc
           echo `brew --prefix llvm@${{ matrix.llvm }}`/bin >> $GITHUB_PATH
+      - name: Install LLVM ${{ matrix.llvm }} and libgc-dev
+        if: startsWith(matrix.os, 'ubuntu')
+        run: |
+          echo 'deb http://apt.llvm.org/focal/ llvm-toolchain-focal-${{ matrix.llvm }} main' | sudo tee /etc/apt/sources.list.d/llvm.list
+          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+          sudo apt-get update
+          sudo apt-get install --no-install-recommends clang-${{ matrix.llvm }} llvm-${{ matrix.llvm }}-dev libgc-dev
+          echo /usr/lib/llvm-${{ matrix.llvm }}/bin >> $GITHUB_PATH
     
       - name: Clang information
         run: |
@@ -43,59 +53,35 @@ jobs:
         run: go build -v ./...
 
       - name: Test
+        if: matrix.os != 'ubuntu-latest'
         run: go test -v ./...
-      
+      - name: Test with coverage
+        if: matrix.os == 'ubuntu-latest'
+        run: go test -v -coverprofile="coverage.txt" -covermode=atomic ./...
+
       - name: Install
         run: go install ./...
       
       - name: LLGO tests
         run: |
-          export LLGOROOT=$PWD
-          bash _test/run.sh
-
-  test-linux:
-    runs-on: ubuntu-20.04
-    strategy:
-      matrix:
-        llvm: [17]
-    steps:
-    - uses: actions/checkout@v4
-
-    - name: Install LLVM ${{ matrix.llvm }} and libgc-dev
-      run: |
-        echo 'deb http://apt.llvm.org/focal/ llvm-toolchain-focal-${{ matrix.llvm }} main' | sudo tee /etc/apt/sources.list.d/llvm.list
-        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-        sudo apt-get update
-        sudo apt-get install --no-install-recommends clang-${{ matrix.llvm }} llvm-${{ matrix.llvm }}-dev libgc-dev
-        echo /usr/lib/llvm-${{ matrix.llvm }}/bin >> $GITHUB_PATH
-    
-    - name: Clang information
-      run: |
-        echo $PATH
-        which clang
-        clang --version
-
-    - name: Set up Go
-      uses: actions/setup-go@v5
-      with:
-        go-version: '1.20'
-
-    - name: Build
-      run: go build -v ./...
-
-    - name: Test
-      run: go test -v -coverprofile="coverage.txt" -covermode=atomic ./...
-    
-    - name: Install
-      run: go install ./...
+          echo "Test result on ${{ matrix.os }} with LLVM ${{ matrix.llvm }}" > result.txt
+          LLGOROOT=$PWD bash .github/workflows/test_llgo.sh
       
-    - name: LLGO tests
-      run: |
-        export LLGOROOT=$PWD
-        bash _test/run.sh
+      - name: Test _demo and _pydemo
+        run: |
+          set +e
+          LLGOROOT=$PWD bash .github/workflows/test_demo.sh
+          exit 0
 
-    - name: Upload coverage reports to Codecov
-      uses: codecov/codecov-action@v4
-      with:
-        token: ${{ secrets.CODECOV_TOKEN }}
-        slug: goplus/llgo
+      - name: PR comment with test result
+        uses: thollander/actions-comment-pull-request@v2
+        with:
+          filePath: result.md
+          create_if_not_exists: true
+          comment_tag: test-result-on-${{ matrix.os }}-with-llvm-${{ matrix.llvm }}
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          slug: goplus/llgo
diff --git a/.github/workflows/test_demo.sh b/.github/workflows/test_demo.sh
new file mode 100644
index 00000000..c10cd020
--- /dev/null
+++ b/.github/workflows/test_demo.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# llgo run subdirectories under _demo and _pydemo
+total=0
+failed=0
+failed_cases=""
+for d in ./_demo/* ./_pydemo/*; do
+  total=$((total+1))
+  if [ -d "$d" ]; then
+    echo "Testing $d"
+    if ! llgo run -v "$d"; then
+      echo "FAIL"
+      failed=$((failed+1))
+      failed_cases="$failed_cases\n$d"
+    else
+      echo "PASS"
+    fi
+  fi
+done
+
+echo "=== Done"
+echo "$((total-failed))/$total tests passed"
+if [ "$failed" -ne 0 ]; then
+  echo -e "Failed cases:$failed_cases"
+  exit 1
+fi
diff --git a/_test/run.sh b/_test/run.sh
index 407453d8..d048155d 100644
--- a/_test/run.sh
+++ b/_test/run.sh
@@ -7,7 +7,6 @@ total=$(echo "$cases" | wc -l | tr -d ' ')
 succ=0
 for idx in $(seq 1 $((total))); do
   case=$(echo "$cases" | sed -n "${idx}p")
-  case_id=$(echo "$case" | cut -d',' -f1)
   case_name=$(echo "$case" | cut -d',' -f2)
   echo "=== Test case: $case_name"
   set +e