chore: add quality infra matrix, constraints, and test baseline fixes

tests/test_channel_contracts.py

@@ -0,0 +1,50 @@
+# -*- coding: utf-8 -*-
+"""Contract tests for channel adapters."""
+
+from agent_reach.channels import get_all_channels
+from agent_reach.config import Config
+
+
+def test_channel_registry_contract():
+    channels = get_all_channels()
+    assert channels, "channel registry must not be empty"
+    names = [ch.name for ch in channels]
+    assert len(names) == len(set(names)), "channel names must be unique"
+
+    for ch in channels:
+        assert isinstance(ch.name, str) and ch.name
+        assert isinstance(ch.description, str) and ch.description
+        assert isinstance(ch.backends, list)
+        assert ch.tier in {0, 1, 2}
+
+
+def test_channel_check_contract_with_minimal_runtime(monkeypatch, tmp_path):
+    # Keep contract tests deterministic by simulating "deps mostly absent".
+    monkeypatch.setattr("shutil.which", lambda _cmd: None)
+    config = Config(config_path=tmp_path / "config.yaml")
+
+    for ch in get_all_channels():
+        status, message = ch.check(config)
+        assert status in {"ok", "warn", "off", "error"}
+        assert isinstance(message, str) and message.strip()
+
+
+def test_channel_can_handle_contract():
+    url_samples = {
+        "github": "https://github.com/panniantong/agent-reach",
+        "twitter": "https://x.com/user/status/1",
+        "youtube": "https://youtube.com/watch?v=abc",
+        "reddit": "https://reddit.com/r/python",
+        "bilibili": "https://www.bilibili.com/video/BV1xx411",
+        "xiaohongshu": "https://www.xiaohongshu.com/explore/123",
+        "douyin": "https://www.douyin.com/video/123",
+        "linkedin": "https://www.linkedin.com/in/test",
+        "bosszhipin": "https://www.zhipin.com/web/geek/job?query=python",
+        "rss": "https://example.com/feed.xml",
+        "exa_search": "https://example.com",
+        "web": "https://example.com",
+    }
+    for ch in get_all_channels():
+        sample = url_samples.get(ch.name, "https://example.com")
+        result = ch.can_handle(sample)
+        assert isinstance(result, bool)