test(config): cover legacy model defaults without presets

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/agent/test_self_model_preset.py

@@ -273,6 +273,8 @@ def test_from_config_injects_default_preset(tmp_path) -> None:
     fake_provider = _provider("openai/gpt-4.1")
     with patch("nanobot.providers.factory.make_provider", return_value=fake_provider):
         loop = AgentLoop.from_config(config)
+    assert loop.model == "openai/gpt-4.1"
+    assert loop.model_preset is None
     assert "default" in loop.model_presets
     assert loop.model_presets["default"].model == "openai/gpt-4.1"
 

tests/config/test_model_presets.py

@@ -12,6 +12,31 @@ def test_resolve_preset_returns_defaults_when_no_preset() -> None:
     assert resolved.reasoning_effort == config.agents.defaults.reasoning_effort
 
 
+def test_legacy_defaults_config_without_presets_still_resolves() -> None:
+    config = Config.model_validate({
+        "agents": {
+            "defaults": {
+                "model": "openai/gpt-4.1",
+                "provider": "openai",
+                "maxTokens": 4096,
+                "contextWindowTokens": 128_000,
+                "temperature": 0.2,
+                "reasoningEffort": "low",
+            }
+        }
+    })
+
+    resolved = config.resolve_preset()
+    assert config.agents.defaults.model_preset is None
+    assert config.model_presets == {}
+    assert resolved.model == "openai/gpt-4.1"
+    assert resolved.provider == "openai"
+    assert resolved.max_tokens == 4096
+    assert resolved.context_window_tokens == 128_000
+    assert resolved.temperature == 0.2
+    assert resolved.reasoning_effort == "low"
+
+
 def test_resolve_preset_returns_active_preset() -> None:
     config = Config.model_validate({
         "model_presets": {