Add test for readme file

test_guidelines.py

@@ -24,6 +24,15 @@ class TestGuidelines(unittest.TestCase):
 
         assert target.is_file()
 
+    def test_has_readme(self):
+        root_dir = run(
+            ["git", "rev-parse", "--show-toplevel"], capture_output=True, text=True
+        ).stdout.strip()
+        target = pathlib.Path(root_dir) / "README.rst"
+        assert target.exists()
+
+        assert target.is_file()
+
     @unittest.skipIf(os.environ.get("already_in_venv"), "Avoid self call infinite loop")
     def test_environment(self):
         """We want to make sure that the project is virtualenv compatible.