Add unit tests for SettingsForm class

[devin-ai-integration]

Add unit tests for SettingsForm class

Summary

Adds comprehensive unit tests for the SettingsForm class in realworld/accounts/tests.py to improve test coverage. The new TestSettingsForm class includes 4 test methods that cover form validation, save behavior with and without database commit, and password handling logic.

Tests added:

• test_invalid_form - Validates that forms with missing required fields (email, name) are rejected
• test_save_without_commit - Verifies form.save(commit=False) updates the user object but doesn't persist to database
• test_save_with_commit - Verifies form.save(commit=True) updates and persists changes to database
• test_save_without_password_change - Ensures empty password field doesn't change existing user password

All tests follow existing code patterns and pass successfully (17/17 tests in accounts app pass).

Review & Testing Checklist for Human

• Verify form validation assumptions - Confirm that missing email or name fields actually make SettingsForm invalid (my tests assume this based on User model analysis)
• Test the password handling logic - Manually verify that SettingsForm only updates password when a non-empty password is provided
• Run the test suite - Execute python manage.py test realworld.accounts.tests.TestSettingsForm to ensure tests pass in your environment

Notes

• Added a 4th test method (test_save_without_password_change) beyond the 3 originally requested to provide more comprehensive coverage of the form's password handling logic
• Tests create isolated user instances and should not interfere with existing test data
• All existing tests continue to pass (verified 17/17 accounts tests pass)

Link to Devin run: https://app.devin.ai/sessions/25875ce04a7549b782f0f497874b2c4f
Requested by: @jpartovi

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring