Add unit tests for untested core modules to increase code coverage

[Copilot]

Plan to Increase Code Coverage

• Add tests for falkordb/exceptions.py - SchemaVersionMismatchException
• Add tests for falkordb/helpers.py - quote_string and stringify_param_value functions
• Add tests for falkordb/execution_plan.py - ProfileStats, Operation, and ExecutionPlan classes
• Add tests for falkordb/sentinel.py - Is_Sentinel and Sentinel_Conn functions
• Add tests for falkordb/cluster.py - Is_Cluster and Cluster_Conn functions
• Add tests for falkordb/query_result.py - QueryResult and parsing functions
• Add tests for falkordb/graph_schema.py - GraphSchema class
• Run tests to validate coverage improvements
• Address code review feedback
• Update .gitignore for coverage artifacts
• Fix lint failures (ruff format, ruff check, mypy)

Summary

Successfully added 106 new unit tests covering 7 previously untested modules with the following coverage improvements:

Module	Coverage
falkordb/exceptions.py	100%
falkordb/helpers.py	100%
falkordb/execution_plan.py	98%
falkordb/sentinel.py	100%
falkordb/cluster.py	100%
falkordb/query_result.py	95%
falkordb/graph_schema.py	100%

All tests pass successfully and all linting checks (ruff format, ruff check, mypy) pass.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Increase code coverage</issue_title>
<issue_description>Review the code coverage report and extend the tests

https://app.codecov.io/gh/FalkorDB/falkordb-py</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Increase code coverage #155

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch copilot/increase-code-coverage

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.71%. Comparing base (62eaeea) to head (36429e9).
⚠️ Report is 43 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
+ Coverage   92.11%   95.71%   +3.59%     
==========================================
  Files          36       45       +9     
  Lines        2906     3734     +828     
==========================================
+ Hits         2677     3574     +897     
+ Misses        229      160      -69     

☔ View full report in Codecov by Sentry.
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[gkorland]

@coderabbitai review

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✅ Actions performed

Review triggered.

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[gkorland]

@copilot please fix the lint failure in the CI

[Copilot]

@copilot please fix the lint failure in the CI

Fixed in commit 449eb36. The lint failures were due to:

1. Unformatted code (imports not sorted, spacing issues)
2. Unused variables in test functions
3. Line length violations in comments

All linting checks now pass: ruff format --check, ruff check, and mypy.

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