test(discord): add tests for channel_skill_bindings resolution

tests/gateway/test_discord_channel_skills.py

@@ -0,0 +1,64 @@
+"""Tests for Discord channel_skill_bindings auto-skill resolution."""
+from unittest.mock import MagicMock
+import pytest
+
+
+def _make_adapter():
+    """Create a minimal DiscordAdapter with mocked config."""
+    from gateway.platforms.discord import DiscordAdapter
+    adapter = object.__new__(DiscordAdapter)
+    adapter.config = MagicMock()
+    adapter.config.extra = {}
+    return adapter
+
+
+class TestResolveChannelSkills:
+    def test_no_bindings_returns_none(self):
+        adapter = _make_adapter()
+        assert adapter._resolve_channel_skills("123") is None
+
+    def test_match_by_channel_id(self):
+        adapter = _make_adapter()
+        adapter.config.extra = {
+            "channel_skill_bindings": [
+                {"id": "100", "skills": ["skill-a", "skill-b"]},
+            ]
+        }
+        assert adapter._resolve_channel_skills("100") == ["skill-a", "skill-b"]
+
+    def test_match_by_parent_id(self):
+        adapter = _make_adapter()
+        adapter.config.extra = {
+            "channel_skill_bindings": [
+                {"id": "200", "skills": ["forum-skill"]},
+            ]
+        }
+        # channel_id doesn't match, but parent_id does (forum thread)
+        assert adapter._resolve_channel_skills("999", parent_id="200") == ["forum-skill"]
+
+    def test_no_match_returns_none(self):
+        adapter = _make_adapter()
+        adapter.config.extra = {
+            "channel_skill_bindings": [
+                {"id": "100", "skills": ["skill-a"]},
+            ]
+        }
+        assert adapter._resolve_channel_skills("999") is None
+
+    def test_single_skill_string(self):
+        adapter = _make_adapter()
+        adapter.config.extra = {
+            "channel_skill_bindings": [
+                {"id": "100", "skill": "solo-skill"},
+            ]
+        }
+        assert adapter._resolve_channel_skills("100") == ["solo-skill"]
+
+    def test_dedup_preserves_order(self):
+        adapter = _make_adapter()
+        adapter.config.extra = {
+            "channel_skill_bindings": [
+                {"id": "100", "skills": ["a", "b", "a", "c", "b"]},
+            ]
+        }
+        assert adapter._resolve_channel_skills("100") == ["a", "b", "c"]