test: Improve test coverage for error handling

These changes enhance the test suite to cover various error scenarios, including keyboard interrupts, runtime errors, commit creation failures, and push failures.  This improvement ensures better code stability and robustness.

tests/test_cli.py

@@ -46,6 +46,21 @@ def test_cli_keyboard_interrupt(mock_parse_args, mock_assistant, capsys):
     captured = capsys.readouterr()
     assert "Program interrupted by user" in captured.out
 
+def test_run_keyboard_interrupt(assistant, capsys):
+    """Test that KeyboardInterrupt is handled properly in GitCommitAssistant.run"""
+    changes = [Change(file="test.py", status="modified", diff="test diff", insertions=1, deletions=0)]
+
+    with patch.multiple(
+        assistant.git_ops,
+        get_unstaged_changes=lambda: changes,
+        get_current_branch=lambda: "main"
+    ):
+        with patch.object(assistant.ai_analyzer, 'analyze_changes', side_effect=KeyboardInterrupt()):
+            with pytest.raises(SystemExit):
+                assistant.run()
+
+    captured = capsys.readouterr()
+    assert "Operation cancelled by user" in captured.out
 
 def test_run_no_changes(assistant):
     with patch("aicmt.git_operations.GitOperations.get_unstaged_changes", return_value=[]):
@@ -115,6 +130,24 @@ def test_run_push_error(mock_confirm, assistant):
             with patch.multiple(assistant.cli, display_commit_groups=lambda x: commit_groups, confirm_push=lambda: True):
                 assistant.run()
 
+@patch("aicmt.cli.parse_args")
+@patch("aicmt.cli.GitCommitAssistant")
+def test_cli_runtime_error(mock_assistant, mock_parse_args, capsys):
+    # Mock GitCommitAssistant to raise a runtime error
+    mock_instance = mock_assistant.return_value
+    mock_instance.run.side_effect = Exception("Simulated runtime error")
+
+    # Call cli function and expect system exit
+    with pytest.raises(SystemExit) as exc_info:
+        cli()
+
+    # Check exit code
+    assert exc_info.value.code == 1
+
+    # Check error message
+    captured = capsys.readouterr()
+    assert "Runtime Error: Simulated runtime error" in captured.out
+
 
 @patch("rich.prompt.Confirm.ask")
 def test_run_no_approved_groups(mock_confirm, assistant):
@@ -128,3 +161,84 @@ def test_run_no_approved_groups(mock_confirm, assistant):
         with patch.multiple(assistant.ai_analyzer, analyze_changes=lambda x: commit_groups):
             with patch.multiple(assistant.cli, display_commit_groups=lambda x: []):
                 assistant.run()
+
+def test_commit_creation_failure(assistant, capsys):
+    changes = [Change(file="test.py", status="modified", diff="test diff", insertions=1, deletions=0)]
+    commit_groups = [{"files": ["test.py"], "commit_message": "test commit", "description": "test description"}]
+
+    with patch.multiple(
+        assistant.git_ops,
+        get_unstaged_changes=lambda: changes,
+        get_current_branch=lambda: "main",
+        stage_files=lambda x: None,
+        commit_changes=lambda x: exec('raise Exception("Failed to create commit")')
+    ):
+        with patch.multiple(assistant.ai_analyzer, analyze_changes=lambda x: commit_groups):
+            with patch.multiple(assistant.cli, display_commit_groups=lambda x: commit_groups):
+                with pytest.raises(SystemExit):
+                    assistant.run()
+
+                captured = capsys.readouterr()
+                assert "Failed to create commit" in captured.out
+
+
+def test_push_confirmation_declined(assistant):
+    changes = [Change(file="test.py", status="modified", diff="test diff", insertions=1, deletions=0)]
+    commit_groups = [{"files": ["test.py"], "commit_message": "test commit", "description": "test description"}]
+
+    with patch.multiple(
+        assistant.git_ops,
+        get_unstaged_changes=lambda: changes,
+        get_current_branch=lambda: "main",
+        stage_files=lambda x: None,
+        commit_changes=lambda x: None
+    ):
+        with patch.multiple(assistant.ai_analyzer, analyze_changes=lambda x: commit_groups):
+            with patch.multiple(
+                assistant.cli,
+                display_commit_groups=lambda x: commit_groups,
+                confirm_push=lambda: False
+            ):
+                assistant.run()
+
+
+def test_push_changes_failure(assistant):
+    changes = [Change(file="test.py", status="modified", diff="test diff", insertions=1, deletions=0)]
+    commit_groups = [{"files": ["test.py"], "commit_message": "test commit", "description": "test description"}]
+
+    with patch.multiple(
+        assistant.git_ops,
+        get_unstaged_changes=lambda: changes,
+        get_current_branch=lambda: "main",
+        stage_files=lambda x: None,
+        commit_changes=lambda x: None,
+        push_changes=lambda: exec('raise Exception("Failed to push commits")')
+    ):
+        with patch.multiple(assistant.ai_analyzer, analyze_changes=lambda x: commit_groups):
+            with patch.multiple(
+                assistant.cli,
+                display_commit_groups=lambda x: commit_groups,
+                confirm_push=lambda: True
+            ):
+                assistant.run()
+
+def test_push_changes_network_error(assistant):
+    """Test push changes fails due to network error"""
+    changes = [Change(file="test.py", status="modified", diff="test diff", insertions=1, deletions=0)]
+    commit_groups = [{"files": ["test.py"], "commit_message": "test commit", "description": "test description"}]
+
+    with patch.multiple(
+        assistant.git_ops,
+        get_unstaged_changes=lambda: changes,
+        get_current_branch=lambda: "main",
+        stage_files=lambda x: None,
+        commit_changes=lambda x: None,
+        push_changes=lambda: exec('raise ConnectionError("Network connection failed")')
+    ):
+        with patch.multiple(assistant.ai_analyzer, analyze_changes=lambda x: commit_groups):
+            with patch.multiple(
+                assistant.cli,
+                display_commit_groups=lambda x: commit_groups,
+                confirm_push=lambda: True
+            ):
+                assistant.run()