Code Review Checklist for Test Automation

Standard Operating Procedure: Code Review Checklist for Test Automation

1. Document Control & Revision History

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2. Executive Summary & Scope

This document defines the mandatory protocol for the validation of Automated Test Scripts (ATS) within the enterprise CI/CD pipeline. The objective is to ensure test reliability, maintainability, and architectural compliance. This SOP applies to all Quality Engineering (QE) and Software Development (SDET) personnel. Compliance with this protocol is a prerequisite for code merging into production-integrated branches, aligning with ISO/IEC 29119 software testing standards.

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3. Prerequisites & Tool Requirements

• Access Requirements: Read/Write access to the enterprise Version Control System (VCS); elevated permissions for CI/CD pipeline configuration (e.g., Jenkins/GitHub Actions).
• Environment: Verified staging/QA environment matching production architecture.
• Software: Integrated Development Environment (IDE) with required linting plugins (e.g., ESLint, Pylint, SonarLint).
• Certifications: Completion of "Secure Coding Practices" and "Automated Testing Framework" internal training.

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4. Roles & Responsibilities (RACI Matrix)

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5. Step-by-Step Operational Procedure

Phase I: Static Analysis & Linting

• Ensure code complies with the project's style guide (e.g., PEP8, Airbnb Style).
• Verify that no hardcoded credentials, API keys, or PII exist in the codebase.
• Confirm that all new dependencies have been vetted against the internal security whitelist.

Phase II: Structural Integrity

• Validate implementation of Page Object Model (POM) or equivalent abstraction layer.
• Confirm usage of explicit waits; ensure no Thread.sleep() or hard-coded delays exist.
• Verify that selector strategies (CSS/XPath) are robust and decoupled from volatile UI elements.

Phase III: Functional Verification

• Confirm test isolation: Each test case must be atomic and capable of running in parallel without data collisions.
• Audit setup and teardown methods for 100% data cleanup (idempotency).
• Ensure proper error handling and logging (e.g., screenshot capture on failure).

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6. Quality Assurance & Verification Criteria

Acceptance Criteria: A Pull Request (PR) shall only be approved if all linting checks pass, the unit test suite returns green, and at least one peer reviewer from the QE department has signed off.

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7. Practical Troubleshooting Scenarios

Scenario A: Test Flakiness (Async Failures)

• Observation: Test intermittently fails due to element loading speeds.
• Corrective Action: Replace all implicit waits or hard-coded sleeps with WebDriverWait (Selenium) or locators.should() (Cypress) using explicit conditions (e.g., visibilityOfElementLocated). Refactor the selector to be more specific (e.g., data-testid attributes).

Scenario B: Data Contamination

• Observation: Test suite fails when running in parallel due to database state conflicts.
• Corrective Action: Implement transactional test isolation. Every test must perform a "cleanup" in the @AfterMethod hook. If isolation is impossible, implement dynamic test data generation (API-level injection) to ensure each test runs against unique records.

Scenario C: Uncaught Exceptions / False Positives

• Observation: The automation returns a "Pass" despite the application under test (AUT) throwing a backend 500 error.
• Corrective Action: Integrate Network Interception (e.g., cy.intercept or RestAssured) to validate response codes in addition to UI elements. Assertion logic must explicitly check for the absence of error-state components.