Add Python tests and CI wofklow

Add some basic tests with pytest. The functions that require Docker Hub
access aren't currently tested.

A GitHub workflow is included to run the tests on push.

.github/workflows/validation.yml

@@ -0,0 +1,26 @@
+name: Validation
+
+on: [push]
+
+jobs:
+  build:
+    name: Python tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v3
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: pip install -r requirements-dev.txt -r requirements.txt
+
+      - name: Run pytest
+        run: pytest -v tests/test.py
+

README.md

@@ -1,5 +1,6 @@
 # Docker Hub Image Tag Deleter
 
+[![Validation](https://github.com/joshbeard/docker-hub-tag-delete/actions/workflows/validation.yml/badge.svg)](https://github.com/joshbeard/docker-hub-tag-delete/actions/workflows/validation.yml)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/25f78736c6fb48db96bde0f04bda7029)](https://www.codacy.com/gh/joshbeard/docker-hub-tag-delete/dashboard?utm_source=github.com&utm_medium=referral&utm_content=joshbeard/docker-hub-tag-delete&utm_campaign=Badge_Grade)
 [![CodeFactor](https://www.codefactor.io/repository/github/joshbeard/docker-hub-tag-delete/badge)](https://www.codefactor.io/repository/github/joshbeard/docker-hub-tag-delete)
 [![DeepSource](https://deepsource.io/gh/joshbeard/docker-hub-tag-delete.svg/?label=active+issues&show_trend=true&token=JBOrbjcsB0m6ImmQ5Sl2MMve)](https://deepsource.io/gh/joshbeard/docker-hub-tag-delete/?ref=repository-badge)
@@ -233,6 +234,7 @@ To activate the Python virtual environment in the container:
 * Improve Markdown parsing and customization (v1)
 * Improve output (v1)
 * List on Marketplace once (v1) items are completed
+* Improve [tests](tests/)
 * CLI arguments in addition to existing env vars?
 * GitLab registry support
 * Build and publish image to Docker Hub (of this tool)

requirements-dev.txt

@@ -0,0 +1 @@
+pytest>=7.0.0

tests/test.json

@@ -0,0 +1,6 @@
+[
+  { "tags": ["4", "4.*"], "date": "April 1, 2022" },
+  { "tags": ["5", "5.*"], "date": "June 10, 2023" },
+  { "tags": ["json-foobar"], "date": "October 31, 2023" }
+]
+

tests/test.md

@@ -0,0 +1,9 @@
+<!-- BEGIN deletion_table -->
+| Tag        | Deletion Date
+| ---------- | ----------------------
+| `1*`       | October 5, 2022
+| `2.*`      | October 5, 2022
+| `3.*`      | October 5, 2040
+| `foobar`   | December 25, 2021
+<!-- END deletion_table -->
+

tests/test.py

@@ -0,0 +1,74 @@
+from datetime import datetime
+import os,sys,inspect
+
+currentdir = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))
+parentdir = os.path.dirname(currentdir)
+sys.path.insert(0,parentdir)
+
+os.environ['MARKDOWN_FILE'] = "tests/test.md"
+os.environ['JSON_FILE'] = "tests/test.json"
+os.environ['DOCKERHUB_REPOSITORY'] = "foo/bar"
+
+target = __import__("hub-tag-delete")
+
+def test_line_is_ignored():
+    assert target.line_is_ignored('| Tag') is True
+    assert target.line_is_ignored('| xTag') is False
+    assert target.line_is_ignored('| 1.0') is False
+    assert target.line_is_ignored('| `1.0`') is False
+
+def test_get_readme_table():
+    taglist = [
+        {'date': 'October 5, 2022', 'tags': ['1*']},
+        {'date': 'October 5, 2022', 'tags': ['2.*']},
+        {'date': 'October 5, 2040', 'tags': ['3.*']},
+        {'date': 'December 25, 2021', 'tags': ['foobar']}
+    ]
+    assert target.get_readme_table() == taglist
+
+def test_parse_date():
+    date = "October 6, 2022"
+    assert target.parse_date(date) == datetime(2022, 10, 6, 0, 0)
+
+def test_parse_md_line():
+    mdline = '| `1.*`, `2.0` | October 6, 2022'
+    result = {'tags': ['1.*',' 2.0'], 'date': 'October 6, 2022'}
+    assert target.parse_md_line(mdline) == result
+
+def test_json_tags():
+    result = [
+        {'date': 'April 1, 2022', 'tags': ['4', '4.*']},
+        {'date': 'June 10, 2023', 'tags': ['5', '5.*']},
+        {'date': 'October 31, 2023', 'tags': ['json-foobar']}
+    ]
+    assert target.json_tags() == result
+
+def test_get_tag_list():
+    taglist = [
+        {'date': 'April 1, 2022', 'tags': ['4', '4.*']},
+        {'date': 'June 10, 2023', 'tags': ['5', '5.*']},
+        {'date': 'October 31, 2023', 'tags': ['json-foobar']},
+        {'date': 'October 5, 2022', 'tags': ['1*']},
+        {'date': 'October 5, 2022', 'tags': ['2.*']},
+        {'date': 'October 5, 2040', 'tags': ['3.*']},
+        {'date': 'December 25, 2021', 'tags': ['foobar']}
+    ]
+    assert target.get_tag_list() == taglist
+
+# TODO: The tests that require Docker Hub connectivity are pending
+def test_tags_to_delete():
+	"""Docker Hub required"""
+	pass
+
+def test_delete_expired_tags():
+	"""Docker Hub required"""
+	pass
+
+def test_docker_hub_token():
+	"""Docker Hub required"""
+	pass
+
+def test_tags_matching_pattern():
+	"""Docker Hub required"""
+	pass
+