Add test files

tests/test_config.py

@@ -0,0 +1,48 @@
+"""Tests for configuration module."""
+
+import pytest
+import tempfile
+import os
+from pathlib import Path
+
+from shellgenius.config import Config, get_config
+
+
+class TestConfig:
+    def test_default_config(self):
+        """Test default configuration values."""
+        with tempfile.NamedTemporaryFile(mode='w', suffix='.yaml', delete=False) as f:
+            f.write("")
+            f.flush()
+            
+            config = Config(f.name)
+            
+            assert config.get("ollama.host") == "localhost:11434"
+            assert config.get("ollama.model") == "codellama"
+            assert config.get("safety.level") == "moderate"
+            
+            os.unlink(f.name)
+    
+    def test_get_nested_value(self):
+        """Test getting nested configuration values."""
+        config = Config()
+        
+        assert config.get("ollama.host") is not None
+        assert config.get("nonexistent.key", "default") == "default"
+    
+    def test_environment_override(self):
+        """Test environment variable overrides."""
+        os.environ["OLLAMA_MODEL"] = "custom-model"
+        
+        config = Config()
+        assert config.ollama_model == "custom-model"
+        
+        del os.environ["OLLAMA_MODEL"]
+    
+    def test_ollama_properties(self):
+        """Test Ollama configuration properties."""
+        config = Config()
+        
+        assert "localhost" in config.ollama_host
+        assert config.ollama_model in ["codellama", "llama2", "mistral"]
+        assert config.safety_level in ["strict", "moderate", "permissive"]