setup project

.gitignore

+test_file.txt

program.py

+# program.py
+import os
+
+def main():
+
+  filename = 'test_file.txt'
+  try:
+      with open(filename, 'r') as file_in:
+          content = file_in.read()
+      messages = [f'Found file {filename}', f'That contains {content}']
+      print('\n'.join(messages))
+
+  except FileNotFoundError:
+      print(f'Creating file {filename}')
+      with open(filename, 'w') as file_out:
+          file_out.write('empty')
+
+  if (value:= os.getenv('GLOBAL_VAR_FOR_CI')) is not None:
+    return f'Hello, {value}!'
+  else:
+    return('Hello, GitLab CI/CD!')
+
+if __name__ == "__main__":
+  out = main()
+  print(out)

test_program.py

+# test_program.py
+import unittest
+from program import main
+
+class TestStringMethods(unittest.TestCase):
+
+  def test_output(self):
+    res = main()
+    self.assertEqual('Hello, GitLab CI/CD!', res)
+
+if __name__ == '__main__':
+    unittest.main()