Add unit testing and example

.github/workflows/python-package-conda.yml

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+name: Python Package using Conda
+
+on: [push]
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 5
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v3
+      with:
+        python-version: '3.10'
+    - name: Add conda to system path
+      run: |
+        # $CONDA is an environment variable pointing to the root of the miniconda directory
+        echo $CONDA/bin >> $GITHUB_PATH
+    - name: Install current library and dependencies
+      run: |
+        pip install -e .
+    # - name: Lint with flake8
+    #   run: |
+    #     conda install flake8
+    #     # stop the build if there are Python syntax errors or undefined names
+    #     flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+    #     # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+    #     flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - name: Test with pytest
+      run: |
+        conda install pytest
+        pytest

pytest.ini

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+# content of pytest.ini
+[pytest]
+python_files = *_test.py
+python_classes = *Test
+python_functions = test_* *_test
+testpaths = tests

tests/compartment_test.py

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+
+import pathlib
+import sys
+
+# NOTE: VN: Since we have installed using `pip install -e .` in the workflow file, we
+# might not need to manually add to the path
+sys.path.append(str(pathlib.Path(__file__).parent.parent))
+
+# import ngcsimlib
+
+class CompartmentTest:
+
+  def test_import(self):
+    success = False
+    try:
+      from ngcsimlib.compartment import Compartment
+      success = True
+    except:
+      success = False
+    assert success, "Import failed!"
+
+