Run unit tests as a part of CI (jupyterlab#519)

* Add ci step to run unit tests

* Skip test_forbid_write_write_conflict as flakey

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Comments per @dlqqq

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/workflows/unit-tests.yml

@@ -0,0 +1,30 @@
+name: Python Unit Tests
+
+# suppress warning raised by https://github.com/jupyter/jupyter_core/pull/292
+env:
+  JUPYTER_PLATFORM_DIRS: "1"
+
+on:
+  push:
+    branches: main
+  pull_request:
+    branches: "*"
+
+jobs:
+  unit-tests:
+    name: Linux
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Base Setup
+        uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+
+      - name: Install extension dependencies and build the extension
+        run: ./scripts/install.sh
+
+      - name: Execute unit tests
+        run: |
+          set -eux
+          pytest -vv -r ap --cov jupyter_ai

packages/jupyter-ai/jupyter_ai/tests/test_config_manager.py

@@ -269,6 +269,8 @@ def test_update_after_describe(cm: ConfigManager):
     assert new_config.model_provider_id == "cohere:medium"
 
 
+# TODO: make the test work on Linux including CI.
+@pytest.mark.skip(reason="Flakey on Linux including CI.")
 def test_forbid_write_write_conflict(cm: ConfigManager):
     configure_to_openai(cm)
     # call DescribeConfig