feat(v0.1.0): project foundation with logging and config

tests/unit/test_config/test_config_loader.py

@@ -0,0 +1,104 @@
+"""Tests for configuration loader."""
+
+import os
+from pathlib import Path
+
+import pytest
+
+from src.config.config_loader import get_config, load_config
+from src.core.exceptions import ConfigurationError
+
+
+def test_load_config_success(temp_config_dir, monkeypatch):
+    """Test successful config loading."""
+    from src.core import constants
+    original_path = constants.PATHS["config"]
+    constants.PATHS["config"] = temp_config_dir
+    
+    config = load_config()
+    assert config is not None
+    assert "app" in config
+    assert config["app"]["name"] == "Test App"
+    
+    constants.PATHS["config"] = original_path
+
+
+def test_load_config_missing_file(temp_dir, monkeypatch):
+    """Test config loading with missing file."""
+    from src.core import constants
+    original_path = constants.PATHS["config"]
+    constants.PATHS["config"] = temp_dir / "nonexistent"
+    
+    with pytest.raises(ConfigurationError):
+        load_config()
+    
+    constants.PATHS["config"] = original_path
+
+
+def test_get_config_with_key(temp_config_dir, monkeypatch):
+    """Test getting config value by key."""
+    from src.core import constants
+    original_path = constants.PATHS["config"]
+    constants.PATHS["config"] = temp_config_dir
+    
+    value = get_config("app.name")
+    assert value == "Test App"
+    
+    constants.PATHS["config"] = original_path
+
+
+def test_get_config_with_default(temp_config_dir, monkeypatch):
+    """Test getting config with default value."""
+    from src.core import constants
+    original_path = constants.PATHS["config"]
+    constants.PATHS["config"] = temp_config_dir
+    
+    value = get_config("nonexistent.key", default="default_value")
+    assert value == "default_value"
+    
+    constants.PATHS["config"] = original_path
+
+
+def test_get_config_none(temp_config_dir, monkeypatch):
+    """Test getting entire config."""
+    from src.core import constants
+    original_path = constants.PATHS["config"]
+    constants.PATHS["config"] = temp_config_dir
+    
+    config = get_config()
+    assert isinstance(config, dict)
+    assert "app" in config
+    
+    constants.PATHS["config"] = original_path
+
+
+def test_env_var_substitution(temp_config_dir, monkeypatch):
+    """Test environment variable substitution in config."""
+    from src.core import constants
+    original_path = constants.PATHS["config"]
+    constants.PATHS["config"] = temp_config_dir
+    
+    # Set environment variable
+    os.environ["TEST_VAR"] = "test_value"
+    
+    # Create config with env var
+    config_file = temp_config_dir / "config.yaml"
+    config_file.write_text(
+        """
+app:
+  name: "${TEST_VAR}"
+  version: "0.1.0"
+"""
+    )
+    
+    # Reset config cache
+    import src.config.config_loader as config_module
+    config_module._config = None
+    
+    config = load_config()
+    assert config["app"]["name"] == "test_value"
+    
+    # Cleanup
+    del os.environ["TEST_VAR"]
+    constants.PATHS["config"] = original_path
+