refactor(reaction): 收敛为单选接口

reaction/tests.py

@@ -0,0 +1,56 @@
+from unittest import TestCase
+
+from reaction.models import Reaction
+from reaction.serializers import SetReactionSerializer
+
+
+class SetReactionSerializerTests(TestCase):
+    def test_accepts_one_reaction(self):
+        serializer = SetReactionSerializer(data={"problem_id": 1, "type": "learned"})
+
+        self.assertTrue(serializer.is_valid(), serializer.errors)
+        self.assertEqual(serializer.validated_data["type"], "learned")
+
+    def test_accepts_legacy_single_reaction(self):
+        serializer = SetReactionSerializer(data={"problem_id": 1, "types": ["learned"]})
+
+        self.assertTrue(serializer.is_valid(), serializer.errors)
+        self.assertEqual(serializer.validated_data["type"], "learned")
+
+    def test_accepts_matching_transition_fields(self):
+        serializer = SetReactionSerializer(data={"problem_id": 1, "type": "learned", "types": ["learned"]})
+
+        self.assertTrue(serializer.is_valid(), serializer.errors)
+
+    def test_rejects_multiple_legacy_reactions(self):
+        serializer = SetReactionSerializer(data={"problem_id": 1, "types": ["learned", "interesting"]})
+
+        self.assertFalse(serializer.is_valid())
+        self.assertIn("types", serializer.errors)
+
+    def test_rejects_mismatched_transition_fields(self):
+        serializer = SetReactionSerializer(data={"problem_id": 1, "type": "learned", "types": ["interesting"]})
+
+        self.assertFalse(serializer.is_valid())
+        self.assertIn("types", serializer.errors)
+
+    def test_rejects_missing_reaction(self):
+        serializer = SetReactionSerializer(data={"problem_id": 1})
+
+        self.assertFalse(serializer.is_valid())
+        self.assertIn("type", serializer.errors)
+
+    def test_rejects_unknown_reaction(self):
+        serializer = SetReactionSerializer(data={"problem_id": 1, "type": "unknown"})
+
+        self.assertFalse(serializer.is_valid())
+        self.assertIn("type", serializer.errors)
+
+
+class ReactionModelConstraintTests(TestCase):
+    def test_one_reaction_per_problem_and_user(self):
+        constraints = {constraint.name: constraint for constraint in Reaction._meta.constraints}
+
+        constraint = constraints["reaction_problem_user_unique"]
+        self.assertEqual(tuple(constraint.fields), ("problem", "user"))
+        self.assertEqual(Reaction._meta.unique_together, ())