diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3e37cb9..6979b22 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -9,7 +9,7 @@ jobs:
 
     runs-on: ${{ matrix.os }}
     strategy:
-      fail-fast: false
+      fail-fast: true
       matrix:
         python-version: [3.9]
         os: [macos-latest, ubuntu-latest, windows-latest]
@@ -20,6 +20,8 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
+      - name: env
+        run: set
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
diff --git a/tests/test_samples.py b/tests/test_samples.py
index 997ade8..f8d7110 100644
--- a/tests/test_samples.py
+++ b/tests/test_samples.py
@@ -10,6 +10,8 @@
 # brew install python-tk
 
 def is_running_on_github_actions():
+    for key, value in os.environ.items():
+        print(f'{key}: {value}')
     github = os.getenv('CI')
     print(f'github: {github}')
     return github == 'true'