Add unittests for Ansible Podman modules (containers#504)

Signed-off-by: Sagi Shnaidman <[email protected]>

.github/workflows/unittests.yml

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+name: Unittests
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: 3 0 * * *  # Run daily at 0:03 UTC
+
+jobs:
+  build-collection-artifact:
+    name: Test
+    runs-on: ${{ matrix.runner-os }}
+    strategy:
+      matrix:
+        runner-os:
+          - ubuntu-22.04
+        # ansible-version:
+        #   - git+https://github.com/ansible/[email protected]
+        runner-python-version:
+          - 3.9
+    steps:
+
+      - name: Check out ${{ github.repository }} on disk
+        uses: actions/checkout@v3
+
+      - name: Set up Python ${{ matrix.runner-python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.runner-python-version }}
+
+      - name: Set up pip cache
+        uses: actions/cache@v1
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('tests/sanity/requirements.txt') }}-${{ hashFiles('tests/unit/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+            ${{ runner.os }}-
+
+      - name: Install requirements for tests
+        run: >-
+          python -m pip install --user -r test-requirements.txt
+
+      - name: Build a collection tarball
+        run: >-
+          ~/.local/bin/ansible-galaxy collection build --output-path
+          "${GITHUB_WORKSPACE}/.cache/collection-tarballs"
+
+      - name: Install the collection tarball
+        run: >-
+          ~/.local/bin/ansible-galaxy collection install ${GITHUB_WORKSPACE}/.cache/collection-tarballs/*.tar.gz
+
+      - name: Run collection unit tests
+        run: >-
+          ~/.local/bin/ansible-test units
+          --python "${{ matrix.runner-python-version }}" -vvv
+          tests/unit/plugins/modules/
+        working-directory: >-
+          /home/runner/.ansible/collections/ansible_collections/containers/podman

test-requirements.txt

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+ansible-core
+pytest
+pytest-forked
+pytest-xdist

tests/unit/plugins/modules/test_common.py

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+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import pytest
+
+from ansible_collections.containers.podman.plugins.module_utils.podman.common import (
+    lower_keys,
+)
+
+
+@pytest.mark.parametrize('test_input, expected', [
+    (["AAA", "BBB"], ["AAA", "BBB"]),
+    ("AAQQ", "AAQQ"),
+    ({"AAA": "AaaAa", "11": 22, "AbCdEf": None, "bbb": "aaaAA"},
+     {"aaa": "AaaAa", "11": 22, "abcdef": None, "bbb": "aaaAA"})
+])
+def test_lower_keys(test_input, expected):
+    print(lower_keys.__code__.co_filename)
+    assert lower_keys(test_input) == expected