feat: require workflow labels for issues (Closes #513)

tests/test_issue_workflow_labels.py

@@ -0,0 +1,73 @@
+"""Tests for canonical issue workflow label policy (#513)."""
+
+from __future__ import annotations
+
+import sys
+import unittest
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+import issue_workflow_labels as labels  # noqa: E402
+
+
+class TestIssueWorkflowLabelValidation(unittest.TestCase):
+    def test_valid_labeled_issue(self):
+        result = labels.assess_issue_labels(["type:feature", "status:ready"])
+        self.assertTrue(result["valid"])
+        self.assertEqual(result["type_labels"], ["type:feature"])
+        self.assertEqual(result["status_labels"], ["status:ready"])
+
+    def test_issue_missing_type_label(self):
+        result = labels.assess_issue_labels(["status:ready"])
+        self.assertFalse(result["valid"])
+        self.assertIn("issue is missing a type:* label", result["errors"])
+
+    def test_issue_missing_status_label(self):
+        result = labels.assess_issue_labels(["type:bug"])
+        self.assertFalse(result["valid"])
+        self.assertIn("issue is missing a status:* label", result["errors"])
+
+    def test_discussion_issue_missing_type_discussion(self):
+        result = labels.assess_issue_labels(
+            ["type:feature", "status:triage"],
+            discussion=True,
+        )
+        self.assertFalse(result["valid"])
+        self.assertIn("discussion issue is missing type:discussion", result["errors"])
+
+    def test_multiple_conflicting_status_labels(self):
+        result = labels.assess_issue_labels(
+            ["type:feature", "status:ready", "status:blocked"]
+        )
+        self.assertFalse(result["valid"])
+        self.assertTrue(
+            any("multiple active status:* labels" in err for err in result["errors"])
+        )
+
+
+class TestIssueWorkflowStatusTransitions(unittest.TestCase):
+    def test_status_transition_removes_old_status_label(self):
+        result = labels.transition_status_labels(
+            ["type:feature", "status:ready", "workflow"],
+            "in-progress",
+        )
+        self.assertEqual(result, ["type:feature", "workflow", "status:in-progress"])
+
+    def test_pr_open_transition_applies_status_pr_open(self):
+        result = labels.transition_status_labels(
+            ["type:feature", "status:in-progress"],
+            "pr-open",
+        )
+        self.assertEqual(result, ["type:feature", "status:pr-open"])
+
+    def test_duplicate_transition_applies_status_duplicate(self):
+        result = labels.transition_status_labels(
+            ["type:process", "status:triage"],
+            "duplicate",
+        )
+        self.assertEqual(result, ["type:process", "status:duplicate"])
+
+
+if __name__ == "__main__":
+    unittest.main()