feat(provider): add LongCat via OpenAI-compatible backend

tests/cli/test_commands.py

@@ -285,6 +285,39 @@ def test_find_by_name_accepts_camel_case_and_hyphen_aliases():
     assert find_by_name("volcengineCodingPlan").name == "volcengine_coding_plan"
     assert find_by_name("github-copilot") is not None
     assert find_by_name("github-copilot").name == "github_copilot"
+    assert find_by_name("longcat") is not None
+    assert find_by_name("longcat").name == "longcat"
+
+
+def test_config_explicit_longcat_provider_resolves_provider_name():
+    config = Config.model_validate(
+        {
+            "agents": {
+                "defaults": {
+                    "provider": "longcat",
+                    "model": "LongCat-Flash-Chat",
+                }
+            },
+            "providers": {
+                "longcat": {
+                    "apiKey": "test-key",
+                }
+            },
+        }
+    )
+
+    assert config.get_provider_name() == "longcat"
+
+
+def test_config_auto_detects_longcat_from_model_keyword():
+    config = Config.model_validate(
+        {
+            "agents": {"defaults": {"provider": "auto", "model": "longcat/LongCat-Flash-Chat"}},
+            "providers": {"longcat": {"apiKey": "test-key"}},
+        }
+    )
+
+    assert config.get_provider_name() == "longcat"
 
 
 def test_config_explicit_xiaomi_mimo_provider_uses_default_api_base():

tests/providers/test_longcat_provider.py

@@ -0,0 +1,29 @@
+"""Tests for the LongCat provider registration."""
+
+from nanobot.config.schema import ProvidersConfig
+from nanobot.providers.registry import PROVIDERS, find_by_name
+
+
+def test_longcat_config_field_exists():
+    """ProvidersConfig should have a longcat field."""
+    config = ProvidersConfig()
+    assert hasattr(config, "longcat")
+
+
+def test_longcat_provider_in_registry():
+    """LongCat should be registered in the provider registry."""
+    specs = {s.name: s for s in PROVIDERS}
+    assert "longcat" in specs
+
+    longcat = specs["longcat"]
+    assert longcat.backend == "openai_compat"
+    assert longcat.env_key == "LONGCAT_API_KEY"
+    assert longcat.default_api_base == "https://api.longcat.chat/openai"
+
+
+def test_find_by_name_longcat():
+    """find_by_name should resolve the LongCat provider."""
+    spec = find_by_name("longcat")
+
+    assert spec is not None
+    assert spec.name == "longcat"