WYSIWYG: Moveable 가이드라인 고도화(중심/가장자리 스냅, 8px 임계) TDD/구현 및 테스트

components/wysiwyg/Canvas.guidelines.edges.test.tsx

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+import React from 'react'
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { render, screen, waitFor } from '@testing-library/react'
+import { act } from 'react-dom/test-utils'
+import { Canvas } from '@/components/wysiwyg/Canvas'
+import type { Frame } from '@/lib/wysiwyg/schema'
+
+const capture = vi.fn()
+
+type MProps = {
+  onDragStart?: () => void
+  onDrag?: (e: { left?: number; top?: number }) => void
+  onDragEnd?: () => void
+}
+
+vi.mock('react-moveable', () => {
+  const Mock = (props: Record<string, unknown>) => {
+    capture(props)
+    return <div data-testid="moveable" />
+  }
+  return { default: Mock }
+})
+
+const frame: Frame = {
+  id: 'f-guides-edges',
+  width: 500,
+  height: 400,
+  background: '#fff',
+  layers: [
+    { id: 'l1', name: 'L1', visible: true, locked: false, objects: [
+      // 드래그 대상(o1) - 기본 선택되도록 첫 번째
+      { id: 'o1', type: 'text', x: 10, y: 10, width: 40, height: 30, rotate: 0, zIndex: 1, props: { text: 'A', fontSize: 16, color: '#000' } },
+      // 기준(o2) - 좌/우 에지: 200, 280
+      { id: 'o2', type: 'text', x: 200, y: 50, width: 80, height: 30, rotate: 0, zIndex: 0, props: { text: 'B', fontSize: 16, color: '#000' } },
+    ]}
+  ]
+}
+
+describe('Canvas guidelines advanced (edge snap)', () => {
+  beforeEach(() => capture.mockReset())
+
+  it('snaps left edge to other object left edge within 8px threshold and shows vertical guide', async () => {
+    render(<Canvas frame={frame} />)
+    const last = capture.mock.calls.at(-1)?.[0] as MProps
+    expect(last).toBeTruthy()
+
+    await act(async () => { last.onDragStart?.() })
+
+    // o2.left = 200. o1을 205로 제안하면 임계(≤8px) 내 → 200으로 스냅
+    await act(async () => { last.onDrag?.({ left: 205, top: 10 }) })
+
+    const obj = screen.getByTestId('obj-o1') as HTMLElement
+    await waitFor(() => {
+      expect(obj.style.left).toBe('200px')
+    })
+
+    // 수직 가이드 라인 표시(에지 x=200)
+    await screen.findByTestId('guide-x')
+
+    await act(async () => { last.onDragEnd?.() })
+    await waitFor(() => {
+      expect(screen.queryByTestId('guide-x')).toBeNull()
+    })
+  })
+})