add test config

metagpt/context.py

@@ -43,11 +43,14 @@ class AttrDict(BaseModel):
 
 
 class LLMMixin:
+    """Mixin class for LLM"""
+
     config: Optional[Config] = None
     llm_config: Optional[LLMConfig] = None
     _llm_instance: Optional[BaseLLM] = None
 
     def use_llm(self, name: Optional[str] = None, provider: LLMType = LLMType.OPENAI):
+        """Use a LLM provider"""
         # 更新LLM配置
         self.llm_config = self.config.get_llm_config(name, provider)
         # 重置LLM实例
@@ -55,7 +58,9 @@ class LLMMixin:
 
     @property
     def llm(self) -> BaseLLM:
-        # 实例化LLM，如果尚未实例化
+        """Return the LLM instance"""
+        if not self.llm_config:
+            self.use_llm()
         if not self._llm_instance and self.llm_config:
             self._llm_instance = create_llm_instance(self.llm_config)
         return self._llm_instance

tests/metagpt/test_config.py

@@ -8,6 +8,7 @@
 
 from metagpt.config2 import Config, config
 from metagpt.configs.llm_config import LLMType
+from tests.metagpt.provider.mock_llm_config import mock_llm_config
 
 
 def test_config_1():
@@ -19,3 +20,9 @@ def test_config_1():
 
 def test_config_2():
     assert config == Config.default()
+
+
+def test_config_from_dict():
+    cfg = Config(llm={"default": mock_llm_config})
+    assert cfg
+    assert cfg.llm["default"].api_key == "mock_api_key"