test: add the unit tests

.gitignore

@@ -0,0 +1,146 @@
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+*.pyc
+
+
+
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+pytestdebug.log
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+doc/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+pythonenv*
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# profiling data
+.prof
+
+# End of https://www.toptal.com/developers/gitignore/api/python

enums.py

@@ -8,3 +8,6 @@ class GitHubActionsInput(str, Enum):
     STRICT = 'INPUT_STRICT'
     TEMPLATE = 'INPUT_TEMPLATE'
     VARIABLES = 'INPUT_VARIABLES'
+
+    def __str__(self):
+        return self.value

unit-tests.py

@@ -1,7 +1,69 @@
+import os
 import unittest
 
+from enums import GitHubActionsInput
+from main import Context
+
+
 class TestContext(unittest.TestCase):
-    pass
+    TEST_FILE = 'test_output'
+
+    def test_load_from_env(self):
+        env_vars = {
+            'foo': 'bar',
+            GitHubActionsInput.VARIABLES.value: 'name=John\nsurname=Doe'
+        }
+
+        context = Context(env_vars)
+        context.load_from_env()
+        expected = {'env': env_vars}
+
+        self.assertEqual(context._variables, expected)
+
+    def test_load_from_input(self):
+        context = Context({GitHubActionsInput.VARIABLES.value: 'name=John\nsurname=Doe'})
+        context.load_from_input()
+
+        expected = {
+            'name': 'John',
+            'surname': 'Doe',
+        }
+        self.assertEqual(context._variables, expected)
+
+
+    def test_load_from_data_file(self):
+        context = Context({
+            GitHubActionsInput.DATA_FILE.value: 'test/data-files/data.yml'
+        })
+
+        context.load_from_data_file()
+
+        expected = {
+            'foo': 'bar',
+            'baz': 'cux',
+        }
+        self.assertEqual(context._variables, expected)
+
+    def test_render_template(self):
+        context = Context({
+            GitHubActionsInput.DATA_FILE.value: 'test/data-files/data.json',
+            GitHubActionsInput.OUTPUT_FILE.value: self.TEST_FILE,
+            GitHubActionsInput.TEMPLATE.value: 'test/many-variables/template',
+        })
+
+        context.load_from_data_file()
+        context.render_template()
+
+        expected = "\nbar\ncux\n"
+
+        with open('test_output', 'r') as file:
+            result = file.read()
+            self.assertEqual(result, expected)
 
+    @classmethod
+    def tearDownClass(cls):
+        if os.path.exists(cls.TEST_FILE):
+            os.remove(cls.TEST_FILE)
+
 if __name__ == '__main__':
     unittest.main()