test: ✅ optimized next field pytest

Author: Sube-mm

tests/test_env_source.py

@@ -3282,3 +3282,23 @@ class StrictSettings(BaseSettings, env_nested_delimiter='__', strict=True):
             'my_int': 1,
         },
     }
+
+
+def test_env_source_when_load_multi_nested_config(env):
+    class EmbeddingModel(BaseModel):
+        model: str = 'text-embedding-3-small'
+        keys: list[str] = Field(default_factory=list)
+
+    class LLM(BaseModel):
+        embeddings: dict[str, EmbeddingModel] = Field(default_factory=dict)
+
+    class LLMSettings(BaseSettings):
+        llm: LLM = Field(default_factory=lambda: LLM())
+
+        model_config = SettingsConfigDict(env_prefix='my_prefix_', env_nested_delimiter='__')
+
+    env.set('my_prefix_llm__embeddings__openai__keys', '["sk-..."]')
+    env.set('my_prefix_llm__embeddings__qwen__keys', '["sk-..."]')
+    llm_setting = LLMSettings()
+    assert llm_setting.llm.embeddings['openai'].keys == ['sk-...']
+    assert llm_setting.llm.embeddings['qwen'].keys == ['sk-...']