Implement the 'pre-commit' YAML checking tool, and add

it to a new pre-commit Github Actions workflow.

Also replace the direct calls to the python framework unit tests
with a new 'pytest' implementation, which should keep the Github
Actions workflow simple even with future additions of new python
unit tests.

Author: nusbaume

.github/workflows/ADF_pre-commit.yaml

@@ -0,0 +1,37 @@
+name: pre-commit
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+  push:
+    # Run the tests one more time, after the PR changes
+    # have been pushed.  The if-statement below prevents
+    # the push from running on other repos.
+    branches:
+      #Trigger workflow on push to any branch or branch heirarchy:
+      - '**'
+
+jobs:
+  #This job is designed to run the "pre-commit"
+  #set of static analysis, linters, and formatters
+  #for Python and YAML.
+  pre-commit:
+    if: github.event_name == 'pull_request' || github.repository == 'NCAR/ADF'
+    runs-on: ubuntu-latest
+    steps:
+    # acquire github action routines
+    - uses: actions/checkout@v3
+    # acquire specific version of python
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.10' # Use python 3.10
+    # install pre-commit package
+    - name: Install pre-commit
+      run: |
+        python -m pip install --upgrade pip  # Install latest version of PIP
+        pip install pre-commit
+    # run pre-commit on ADF code
+    - name: Run pre-commit
+      run: pre-commit run -a
+

.github/workflows/ADF_unit_tests.yaml

@@ -25,22 +25,19 @@ jobs:
       fail-fast: false
     steps:
     # Acquire github action routines:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     # Acquire specific version of python:
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     # Install needed python packages:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip  # Install latest version of PIP
         pip install pyyaml                   # Install PyYAML python package
+        pip install pytest                   # Install pytest python package
     # Run python unit tests related to ADF library:
     - name: ADF lib unit tests
-      run: |
-        #AdfBase unit tests:
-        python lib/test/unit_tests/test_adf_base.py
-        #AdfConfig unit tests:
-        python lib/test/unit_tests/test_adf_config.py
+      run: pytest lib/test/unit_tests
 

.pre-commit-config.yaml

@@ -0,0 +1,9 @@
+#Configuration file for the "pre-commit" linting/formatting tool.
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.3.0
+    hooks:
+      - id: check-yaml
+
+#End of file.

lib/test/unit_tests/pytest.ini

@@ -0,0 +1,2 @@
+[pytest]
+addopts=-p no:logging