Add CI to check all files can be imported

.github/workflows/auto-testing.yml

@@ -10,7 +10,6 @@ on:
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -47,4 +46,34 @@ jobs:
       run: |
         pip install readme-renderer
         python -m readme_renderer README.rst >/dev/null
-
+
+  check-import:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version:
+          - '3.9'
+          - '3.10'
+          - '3.11'
+          - '3.12'
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Update version in linebot/__about__.py
+        run: |
+          VERSION="12.3.0"
+          VERSION=${VERSION#v}
+          sed -i "s/__version__ = '__LINE_BOT_SDK_PYTHON_VERSION__'/__version__ = '$VERSION'/g" linebot/__about__.py
+          cat linebot/__about__.py
+
+      - name: Install dependencies & lib
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e .
+      - name: Run import check
+        run: python import_check.py

import_check.py

@@ -0,0 +1,14 @@
+import pkgutil
+import importlib
+import linebot
+
+def import_all_modules(package):
+    for importer, modname, ispkg in pkgutil.walk_packages(package.__path__, package.__name__ + '.'):
+        try:
+            importlib.import_module(modname)
+            print(f'Successfully imported {modname}')
+        except Exception as e:
+            print(f'Failed to import {modname}: {e}')
+            raise
+
+import_all_modules(linebot)