diff --git a/shellhist/tests/test_cli.py b/shellhist/tests/test_cli.py
index 5b230b6..f54189b 100644
--- a/shellhist/tests/test_cli.py
+++ b/shellhist/tests/test_cli.py
@@ -8,7 +8,7 @@ from shellhist.cli import main
 class TestCLI:
     """Test CLI main entry point."""
 
-    def test_version(self):
+    def test_version(self) -> None:
         """Test version option."""
         runner = CliRunner()
         result = runner.invoke(main, ["--version"])
@@ -16,7 +16,7 @@ class TestCLI:
         assert result.exit_code == 0
         assert "shellhist" in result.output.lower()
 
-    def test_help(self):
+    def test_help(self) -> None:
         """Test help option."""
         runner = CliRunner()
         result = runner.invoke(main, ["--help"])
@@ -25,42 +25,42 @@ class TestCLI:
         assert "search" in result.output
         assert "patterns" in result.output
 
-    def test_search_command_exists(self):
+    def test_search_command_exists(self) -> None:
         """Test search subcommand exists."""
         runner = CliRunner()
         result = runner.invoke(main, ["search", "--help"])
         
         assert result.exit_code == 0
 
-    def test_patterns_command_exists(self):
+    def test_patterns_command_exists(self) -> None:
         """Test patterns subcommand exists."""
         runner = CliRunner()
         result = runner.invoke(main, ["patterns", "--help"])
         
         assert result.exit_code == 0
 
-    def test_suggest_aliases_command_exists(self):
+    def test_suggest_aliases_command_exists(self) -> None:
         """Test suggest-aliases subcommand exists."""
         runner = CliRunner()
         result = runner.invoke(main, ["suggest-aliases", "--help"])
         
         assert result.exit_code == 0
 
-    def test_analyze_time_command_exists(self):
+    def test_analyze_time_command_exists(self) -> None:
         """Test analyze-time subcommand exists."""
         runner = CliRunner()
         result = runner.invoke(main, ["analyze-time", "--help"])
         
         assert result.exit_code == 0
 
-    def test_export_script_command_exists(self):
+    def test_export_script_command_exists(self) -> None:
         """Test export-script subcommand exists."""
         runner = CliRunner()
         result = runner.invoke(main, ["export-script", "--help"])
         
         assert result.exit_code == 0
 
-    def test_search_with_missing_history(self):
+    def test_search_with_missing_history(self) -> None:
         """Test search with non-existent history file."""
         runner = CliRunner()
         result = runner.invoke(
@@ -71,7 +71,7 @@ class TestCLI:
         assert result.exit_code != 0
         assert "not found" in result.output.lower() or "error" in result.output.lower()
 
-    def test_patterns_with_missing_history(self):
+    def test_patterns_with_missing_history(self) -> None:
         """Test patterns with non-existent history file."""
         runner = CliRunner()
         result = runner.invoke(