Add comprehensive test suite analysis and prioritized implementation issues

[Copilot]

This PR provides a detailed analysis of the current test suite effectiveness for the Dogs GraphQL API as requested in the issue. The analysis reveals critical gaps in test coverage and provides actionable recommendations for improvement.

Current State Assessment

The repository currently has zero effective test coverage despite having a CI pipeline that runs tests. The existing DogsgraphqlApplicationTests.java class is empty and provides no validation of the application's functionality.

Key Findings

Critical Issues Identified:

• 0% test coverage across all components (Query resolvers, Mutation resolvers, Entity classes, Exception handlers)
• No integration testing for GraphQL API endpoints or database operations
• No validation of core business logic (dog CRUD operations, breed deletion, name updates)
• Missing error handling tests for custom exceptions (DogNotFoundException, BreedNotFoundException)

Technology Stack Analysis:

• ✅ Strong testing dependencies available (JUnit 5, Mockito, Spring Boot Test, AssertJ)
• ❌ Missing GraphQL-specific testing libraries
• ⚠️ CI configuration mismatch (Java 17 in POM vs Java 21 in CI)

Risk Assessment

Without proper testing, the application faces:

• High risk of production bugs in core CRUD operations
• Medium risk of data corruption through unvalidated GraphQL mutations
• High risk of regression introduction during future changes
• Critical risk of runtime exceptions causing service downtime

Recommendations Summary

The analysis provides a prioritized improvement plan:

1. Immediate Priority (P0): Basic application context and repository tests
2. High Priority (P1): GraphQL integration tests and exception handling
3. Medium Priority (P2): Test coverage reporting and performance tests
4. Low Priority (P3): Contract testing and security validation

Estimated effort: 84-126 developer hours for production-ready test coverage.

Implementation Strategy

A phased 4-week approach is recommended:

• Week 1: Foundation tests and CI fixes
• Week 2: Core business logic testing
• Week 3: Quality assurance and coverage reporting
• Week 4: Advanced testing features

Prioritized GitHub Issues Breakdown

NEW: A comprehensive breakdown of 11 prioritized GitHub issues has been created in PRIORITIZED_TEST_ISSUES.md to enable systematic implementation of the testing recommendations:

• Issues build(deps): Bump org.springframework.boot:spring-boot-starter-parent from 2.7.15 to 3.3.4 #1-2 (P0 - Critical): Basic context test and repository testing
• Issues build(deps): Bump org.springframework.boot:spring-boot-starter-parent from 3.3.5 to 3.4.0 #3-6 (P1 - High): Resolver tests, exception handling, and GraphQL integration
• Issues build(deps): Bump org.springframework.boot:spring-boot-starter-parent from 3.4.3 to 3.4.4 #7-9 (P2 - Medium): Coverage reporting, CI fixes, and performance testing
• Issues build(deps): Bump org.springframework.boot:spring-boot-starter-parent from 3.5.0 to 3.5.3 #10-11 (P3 - Low): Contract testing and security validation

Each issue includes detailed titles with priority numbers (1, 2, 3, etc.), comprehensive descriptions, clear acceptance criteria, implementation guidance, and effort estimates for easy GitHub issue creation and project planning.

The detailed analysis includes specific code examples, testing patterns, and metrics to guide the implementation of a robust test suite that will provide confidence in the application's reliability and maintainability.

This comprehensive report addresses the acceptance criteria by evaluating the test suite effectiveness and providing actionable improvement recommendations without modifying the existing codebase.

Fixes #14

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Review the test suite</issue_title>
<issue_description>Understand the code base, evaluate the test suite step by step and provide a detailed report about its effectiveness and how we could improve it.

Acceptance criteria:
In the pull request comment this detailed report is shown

Requirements:
Do not change anything in the codebase</issue_description>

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

Fixes #14

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[ltpitt]

@copilot
Please create dedicated issues that begin with numbers allowing to understand easily priority e.g. 1 <title>, 2 <title> etc so that we cna implement all the suggestions of the report.

[Copilot]

@copilot
Please create dedicated issues that begin with numbers allowing to understand easily priority e.g. 1 <title>, 2 <title> etc so that we cna implement all the suggestions of the report.

I understand you want me to create prioritized GitHub issues based on the test suite analysis. Unfortunately, I don't have the necessary permissions to create issues directly in the repository.

Instead, I can provide you with a detailed breakdown of the issues that should be created with proper titles, descriptions, and priority numbers. Would you like me to create a structured list of issues with content ready for you to copy and create manually? This way you'll have all the necessary details including acceptance criteria, implementation guidance, and effort estimates for each priority level.