Add test files (unit and integration tests)

tests/unit/test_cli.py

@@ -1,12 +1,11 @@
 """Unit tests for CLI commands."""
 
+from unittest.mock import MagicMock, patch
+
 import pytest
 from click.testing import CliRunner
-from unittest.mock import patch, MagicMock
-import sys
-from io import StringIO
 
-from loglens.cli.commands import analyze, watch, report, patterns, info
+from loglens.cli.commands import analyze, info, patterns, report, watch
 
 
 @pytest.fixture
@@ -18,7 +17,7 @@ def runner():
 class TestAnalyzeCommand:
     """Tests for analyze command."""
 
-    @patch('loglens.cli.commands.LogAnalyzer')
+    @patch("loglens.cli.commands.LogAnalyzer")
     def test_analyze_file(self, mock_analyzer_class, runner, tmp_path):
         """Test analyzing a log file."""
         mock_analyzer = MagicMock()
@@ -43,7 +42,7 @@ class TestAnalyzeCommand:
 
         assert result.exit_code == 0
 
-    @patch('loglens.cli.commands.LogAnalyzer')
+    @patch("loglens.cli.commands.LogAnalyzer")
     def test_analyze_json_output(self, mock_analyzer_class, runner, tmp_path):
         """Test analyze with JSON output."""
         mock_analyzer = MagicMock()
@@ -90,7 +89,7 @@ class TestWatchCommand:
 class TestReportCommand:
     """Tests for report command."""
 
-    @patch('loglens.cli.commands.LogAnalyzer')
+    @patch("loglens.cli.commands.LogAnalyzer")
     def test_report_to_file(self, mock_analyzer_class, runner, tmp_path):
         """Test report generation to file."""
         mock_analyzer = MagicMock()
@@ -118,7 +117,7 @@ class TestReportCommand:
 class TestPatternsCommand:
     """Tests for patterns command."""
 
-    @patch('loglens.cli.commands.LogAnalyzer')
+    @patch("loglens.cli.commands.LogAnalyzer")
     def test_list_patterns(self, mock_analyzer_class, runner):
         """Test listing patterns."""
         mock_analyzer = MagicMock()