diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
new file mode 100644
index 0000000..3014ff5
--- /dev/null
+++ b/.github/workflows/push.yml
@@ -0,0 +1,40 @@
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.12
+
+      - name: cache poetry install
+        uses: actions/cache@v4
+        with:
+          path: ~/.local
+          key: poetry-1.8.3-0
+
+      - uses: snok/install-poetry@v1
+        with:
+          version: 1.8.3
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+
+      - name: cache deps
+        id: cache-deps
+        uses: actions/cache@v4
+        with:
+          path: .venv
+          key: pydeps-${{ hashFiles('**/poetry.lock') }}
+
+      - run: poetry install --no-interaction --no-root
+        if: steps.cache-deps.outputs.cache-hit != 'true'
+
+      - run: poetry install --no-interaction
+
+      - run: poetry run pytest
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 0a52212..4f6dce0 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -1,3 +1,5 @@
+from unittest.mock import patch
+
 from click.testing import CliRunner
 import pytest
 
@@ -34,16 +36,13 @@ def test_info_with_config_summarizes(cli_runner):
     for key in ['auth_id', 'data_dir', 'environment', 'local_output_dir', 'kinesis_arn', 'provider', 'ummg_dir', 'version']:
         assert key in result.output
 
-def test_process_requires_config(cli_runner):
+@patch('nsidc.metgen.metgen.process')
+def test_process_requires_config_does_not_call_process(mock, cli_runner):
     result = cli_runner.invoke(cli, ['process'])
+    assert not mock.called
     assert result.exit_code != 0
 
-def test_process_with_config(cli_runner):
+@patch('nsidc.metgen.metgen.process')
+def test_process_with_config_calls_process(mock, cli_runner):
     result = cli_runner.invoke(cli, ['process', '--config', './example/modscg.ini'])
-    assert result.exit_code == 0
-
-def test_process_output(cli_runner):
-    result = cli_runner.invoke(cli, ['process', '--config', './example/modscg.ini'])
-    assert result.exit_code == 0
-    assert 'Saved CNM message' in result.output
-    assert 'Processed granules' in result.output
+    assert mock.called