Group VuMark generation tests in class

[adamtheturtle]

Summary

• Moved test_generate_instance_success into a TestGenerateInstance class
• Applied @pytest.mark.usefixtures decorator at the class level to reduce duplication
• Refactored long lines to comply with line length limits

Test plan

• Existing tests continue to pass with the new class structure

🤖 Generated with Claude Code

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Note

Low Risk
Low risk test-only refactor that changes pytest collection structure but not request/response assertions or production code paths.

Overview
Refactors tests/mock_vws/test_vumark_generation_api.py by moving test_generate_instance_success into a TestGenerateInstance class and applying @pytest.mark.usefixtures("verify_mock_vuforia") at the class level.

Minor readability tweaks were made (e.g., introducing target_id/body_dict locals and splitting the response Content-Type extraction into a named variable) without changing the test’s behavior or assertions.

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