Add mockapi source files and tests

tests/unit/test_config.py

@@ -27,12 +27,7 @@ class TestConfig:
 
     def test_load_from_dict(self):
         """Test creating config with dict values."""
-        config = Config(
-            port=3000,
-            host="127.0.0.1",
-            delay=100,
-            seed=123,
-        )
+        config = Config(port=3000, host="127.0.0.1", delay=100, seed=123)
         assert config.port == 3000
         assert config.host == "127.0.0.1"
         assert config.delay == 100
@@ -73,9 +68,7 @@ class TestConfig:
             "seed": 456,
         }
 
-        with tempfile.NamedTemporaryFile(
-            mode="w", suffix=".yaml", delete=False
-        ) as f:
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
             yaml.dump(config_data, f)
             temp_path = f.name
 
@@ -93,9 +86,7 @@ class TestConfig:
         """Test that environment variables override file config."""
         config_data = {"port": 7000, "host": "0.0.0.0"}
 
-        with tempfile.NamedTemporaryFile(
-            mode="w", suffix=".yaml", delete=False
-        ) as f:
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
             yaml.dump(config_data, f)
             temp_path = f.name
 
@@ -111,4 +102,4 @@ class TestConfig:
     def test_load_config_default_path(self):
         """Test load_config with no arguments."""
         config = load_config()
-        assert isinstance(config, Config)
+        assert isinstance(config, Config)