test: Add test cases for redirection error handling

- Add test for missing output redirection path
- Add test for invalid redirection target
- Fix code formatting

Author: Yoshihiro Takahara

tests/conftest.py

@@ -1,5 +1,6 @@
 import os
 
+
 # Configure pytest-asyncio
 def pytest_configure(config):
     """Configure pytest-asyncio defaults"""

tests/test_shell_executor_redirections.py

@@ -122,3 +122,11 @@ async def test_invalid_redirection_paths():
     # Test missing path for input redirection
     with pytest.raises(ValueError, match="Missing path for input redirection"):
         executor._parse_command(["cat", "<"])
+
+    # Test missing path for output redirection
+    with pytest.raises(ValueError, match="Missing path for output redirection"):
+        executor._parse_command(["echo", "test", ">"])
+
+    # Test invalid redirection target: operator found for output
+    with pytest.raises(ValueError, match="Invalid redirection target: operator found"):
+        executor._parse_command(["echo", "test", ">", ">"])