[TEST] 통합 테스트(form)

##TASK CARD

Assignee : [이름]

Task Description : [작업 상세 내용]

Date : [작업일]

Estimated Time : [예상 소요 시간, 단위 h]

Consumed Time : [실제 소요 시간, 단위 h]

###Labeling Rule
- Branch : `Feature`
- Estimated time : `E : 2h`
- Consumed time : `C : 1h`
- Page : `Main Page` (only client)
- Controller : `Sign up` (only server)
- Priority : `Priority : Low` | `Priority : Medium` | `Priority : High`
- Main tech : `Express` | `React` | `MySQL`
- Refactoring : `Refactoring`

The issue body is only a task-card template and names no files, tests, or entry point. First clarify which form integration behavior and project area are in scope; done cannot be defined until a target and expected result are specified.

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