Close PRs that try to merge a user's maintenance branch into master (GH-70)

Close PR that tries to merge the user's maintenance branch into CPython's master.

Author: Mariatta

bedevere/close_pr.py

@@ -4,7 +4,7 @@
 import gidgethub.routing
 
 
-PYTHON_MAINT_BRANCH_RE = re.compile(r'^python:\d+.\d+$')
+PYTHON_MAINT_BRANCH_RE = re.compile(r'^\w+:\d+.\d+$')
 
 router = gidgethub.routing.Router()
 
@@ -15,7 +15,7 @@ async def close_invalid_pr(event, gh, *args, **kwargs):
 
     PR is considered invalid if:
     * base_label is 'python:master'
-    * head_label is 'python:<maint_branch>'
+    * head_label is '<username>:<maint_branch>'
     """
     head_label = event.data["pull_request"]["head"]["label"]
     base_label = event.data["pull_request"]["base"]["label"]
@@ -25,4 +25,3 @@ async def close_invalid_pr(event, gh, *args, **kwargs):
         data = {'state': 'closed',
                 'maintainer_can_modify': True}
         await gh.patch(event.data["pull_request"]["url"], data=data)
-

tests/test_close_pr.py

@@ -103,3 +103,32 @@ async def test_valid_pr_not_closed():
     await close_pr.router.dispatch(event, gh)
     patch_data = gh.patch_data
     assert patch_data is None
+
+
+@pytest.mark.asyncio
+async def test_close_invalid_pr_on_open_not_python_as_head():
+    data = {
+        "action": "opened",
+        "pull_request": {
+            "statuses_url": "https://api.github.com/blah/blah/git-sha",
+            "title": "No issue in title",
+            "issue_url": "issue URL",
+            "url": "https://api.github.com/org/repo/pulls/123",
+            "head": {
+                "label": "username123:3.6"
+            },
+            "base": {
+                "label": "python:master"
+            }
+        },
+    }
+    pr_data = {
+        "labels": [
+            {"name": "non-trivial"},
+        ]
+    }
+    event = sansio.Event(data, event="pull_request", delivery_id="12345")
+    gh = FakeGH(getitem=pr_data)
+    await close_pr.router.dispatch(event, gh)
+    patch_data = gh.patch_data
+    assert patch_data["state"] == "closed"