[tests] ignore otError in spinel tests (#5093)

.github/workflows/simulation.yml

@@ -222,7 +222,7 @@ jobs:
     - name: Codecov
       uses: codecov/codecov-action@v1
 
-  ncp:
+  ncp-gcc-m32:
     runs-on: ubuntu-18.04
     env:
       CFLAGS: -m32
@@ -250,3 +250,31 @@ jobs:
         VERBOSE=1 make -f examples/Makefile-simulation check
     - name: Codecov
       uses: codecov/codecov-action@v1
+
+  ncp-clang:
+    runs-on: ubuntu-18.04
+    env:
+      COVERAGE: 1
+      NODE_TYPE: ncp-sim
+      PYTHONUNBUFFERED: 1
+      REFERENCE_DEVICE: 1
+      VIRTUAL_TIME: 1
+      CC: clang
+      CXX: clang++
+    steps:
+      - uses: actions/checkout@v2
+      - name: Bootstrap
+        run: |
+          sudo apt-get update
+          sudo apt-get --no-install-recommends install -y python3-setuptools
+          python3 -m pip install -r tests/scripts/thread-cert/requirements.txt
+          sudo python3 -m pip install git+https://github.com/openthread/pyspinel
+      - name: Build
+        run: |
+          ./bootstrap
+          make -f examples/Makefile-simulation
+      - name: Run
+        run: |
+          VERBOSE=1 make -f examples/Makefile-simulation check
+      - name: Codecov
+        uses: codecov/codecov-action@v1