Improve comments views test coverage from 73% to 100%

[devin-ai-integration]

Improve comments views test coverage from 73% to 100%

Summary

This PR adds comprehensive test cases for the comments views to improve test coverage from 73% to 100%. The changes include:

• New TestEditCommentView class with 4 test methods covering GET requests, valid/invalid POST requests, and unauthorized access
• New TestDeleteCommentView class with 2 test methods covering successful deletion and unauthorized access
• Enhanced TestAddCommentView class with an additional test for invalid form submission
• Fixed form validation assertions to check form.errors in context instead of HTML content

The total test count increased from 33 to 40 tests, and overall project coverage improved from 92% to 94%.

Review & Testing Checklist for Human

Risk Level: 🟡 Medium - Test logic needs verification

• Verify test assertions match actual behavior - Run a few manual tests through the UI to ensure the test expectations align with real application behavior
• Check form validation error handling - Confirm that form validation errors are properly handled (I changed assertions from checking HTML to checking form.errors)
• Validate authorization edge cases - Test that unauthorized users truly cannot edit/delete others' comments
• Run full test suite locally - Ensure all 40 tests pass and no regressions were introduced

Recommended Test Plan:

1. Start the development server and create a test article with comments
2. Try editing/deleting comments as the owner vs non-owner
3. Submit invalid comment forms to verify error handling
4. Run coverage run --source='.' manage.py test && coverage report to confirm coverage

---

Diagram

%%{ init : { "theme" : "default" }}%%
graph TB
    subgraph Legend
        L1["Major Edit"]:::major-edit
        L2["Minor Edit"]:::minor-edit  
        L3["Context/No Edit"]:::context
    end
    
    views["realworld/comments/views.py<br/>add_comment, edit_comment, delete_comment"]:::context
    tests["realworld/comments/tests.py<br/>+TestEditCommentView<br/>+TestDeleteCommentView<br/>Enhanced TestAddCommentView"]:::major-edit
    models["realworld/comments/models.py<br/>Comment model"]:::context
    forms["realworld/comments/forms.py<br/>CommentForm"]:::context
    
    tests -->|"tests all view functions"| views
    views -->|"uses"| models
    views -->|"uses"| forms
    tests -->|"creates test data"| models
    
    classDef major-edit fill:#90EE90
    classDef minor-edit fill:#87CEEB  
    classDef context fill:#FFFFFF

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Notes

• The comment form template doesn't display validation errors in HTML (unlike other forms in the project), which is why I had to change the validation test assertions
• Authorization is enforced at the view level using get_object_or_404(Comment, author=request.user, pk=comment_id)
• All tests use Django's test client with force_login() to simulate authenticated requests

Session Details:

• Link to Devin run: https://app.devin.ai/sessions/b4f657d016c34ae2b43636a920352a6f
• Requested by: Shawn Azman (@ShawnAzman)

[devin-ai-integration]

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