Add unit tests for SettingsForm to improve test coverage

[devin-ai-integration]

Add unit tests for SettingsForm to improve test coverage

Summary

Added a new TestSettingsForm test class with 3 test methods to provide unit test coverage for the SettingsForm class in accounts/forms.py. The tests follow the existing TestUserCreationForm pattern and cover the three requested scenarios:

• Invalid form validation: Tests that forms with missing required fields (email, name) are properly rejected
• Valid form save without commit: Tests that form.save(commit=False) creates a user object without persisting to database
• Valid form save with commit: Tests that form.save(commit=True) creates and persists a user object to database

All 16 tests in the accounts test suite pass, including the 3 new SettingsForm tests.

Review & Testing Checklist for Human

• Run tests locally to confirm all tests pass: python manage.py test realworld.accounts.tests.TestSettingsForm -v 2
• Review test coverage gaps - the tests don't cover password field behavior (SettingsForm has optional password handling logic)
• Consider testing with existing user instances - current tests only create new users, but SettingsForm is typically used to update existing user settings

Notes

• Tests follow the existing TestUserCreationForm pattern for consistency
• Password field testing was not included in the original requirements but might be worth adding for completeness
• Link to Devin run: https://app.devin.ai/sessions/d19c448fbcb14b069b194aa2f8f26553
• Requested by: @jpartovi

[devin-ai-integration]

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