Add test files

tests/test_explainer.py

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+"""Tests for script explainer module."""
+
+import pytest
+from unittest.mock import Mock, patch
+
+from shellgenius.explainer import ShellExplainer, explain_script, LineExplanation, ScriptExplanation
+
+
+class TestShellExplainer:
+    def test_basic_explanation(self):
+        """Test basic script explanation."""
+        with patch('shellgenius.explainer.get_ollama_client') as mock_client:
+            mock_client.return_value.generate.return_value = {"success": False}
+            
+            explainer = ShellExplainer()
+            result = explainer.explain("echo hello", detailed=False)
+            
+            assert result.shell_type == "bash"
+            assert len(result.line_explanations) >= 1
+    
+    def test_detect_shell_purpose(self):
+        """Test detection of script purpose."""
+        with patch('shellgenius.explainer.get_ollama_client') as mock_client:
+            mock_client.return_value.generate.return_value = {"success": False}
+            
+            explainer = ShellExplainer()
+            
+            git_script = "git clone repo\ngit status"
+            result = explainer.explain(git_script, detailed=False)
+            
+            assert "Git" in result.overall_purpose or "git" in result.overall_purpose.lower()
+
+
+class TestExplainScript:
+    def test_convenience_function(self):
+        """Test the convenience function for explaining scripts."""
+        with patch('shellgenius.explainer.get_ollama_client') as mock_client:
+            mock_client.return_value.generate.return_value = {"success": False}
+            
+            result = explain_script("echo hello", detailed=False)
+            
+            assert isinstance(result, ScriptExplanation)
+            assert result.shell_type == "bash"