E2E: 스냅 우선순위 확장 - 센터 우선, 그리드 단독 스냅(13→16) 케이스 추가

tests/e2e/wysiwyg-snap-priority.e2e.ts

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+import { test, expect } from '@playwright/test'
+
+const wysiwygUrl = '/en/wysiwyg'
+
+// Helper to read left/top/width from inline styles
+async function getBox(page: import('@playwright/test').Page, nth: number) {
+  const el = page.locator('[data-testid^="obj-text-"]').nth(nth)
+  const left = await el.evaluate((n) => parseInt((n as HTMLElement).style.left || '0', 10))
+  const top = await el.evaluate((n) => parseInt((n as HTMLElement).style.top || '0', 10))
+  const width = await el.evaluate((n) => parseInt((n as HTMLElement).style.width || '0', 10))
+  return { left, top, width }
+}
+
+test.describe('WYSIWYG - Snap priority (edge > center > grid)', () => {
+  test('dragging near another object prefers edge snap over grid', async ({ page }) => {
+    await page.goto(wysiwygUrl)
+    const canvas = page.getByTestId('wysiwyg-canvas')
+    await expect(canvas).toBeVisible()
+
+    // Add two text objects
+    const addText = page.getByRole('button', { name: /^Add Text$/i })
+    await addText.click()
+    await addText.click()
+
+    // Marquee select the second to get its bbox and then drag it near the first one's right edge
+    const first = page.locator('[data-testid^="obj-text-"]').first()
+    const second = page.locator('[data-testid^="obj-text-"]').nth(1)
+
+    const b1 = await first.boundingBox()
+    const b2 = await second.boundingBox()
+    if (!b1 || !b2) throw new Error('objects not found')
+
+    // Drag second so that its left aligns to first.right (edge snapping scenario)
+    // move handle point from second.x+5 to target x = first.right - 2 (close enough to trigger snap)
+    const targetX = b1.x + b1.width - 2
+    await page.mouse.move(b2.x + 5, b2.y + 5)
+    await page.mouse.down()
+    await page.mouse.move(targetX, b2.y + 5)
+    await page.mouse.up()
+
+    // Read inline left/width to verify alignment: second.left ~= first.left + first.width
+    const s = await getBox(page, 1)
+    const f = await getBox(page, 0)
+    const expectedLeft = f.left + f.width
+    // Allow small tolerance (±1) due to rounding during drag
+    expect(Math.abs(s.left - expectedLeft)).toBeLessThanOrEqual(1)
+  })
+
+  test('dragging near another object prefers center snap over grid', async ({ page }) => {
+    await page.goto(wysiwygUrl)
+    const canvas = page.getByTestId('wysiwyg-canvas')
+    await expect(canvas).toBeVisible()
+
+    const addText = page.getByRole('button', { name: /^Add Text$/i })
+    await addText.click()
+    await addText.click()
+
+    const first = page.locator('[data-testid^="obj-text-"]').first()
+    const second = page.locator('[data-testid^="obj-text-"]').nth(1)
+    const b1 = await first.boundingBox()
+    const b2 = await second.boundingBox()
+    if (!b1 || !b2) throw new Error('objects not found')
+
+    // Target the center alignment: move second so its centerX ~= first.centerX
+    const firstCenterX = b1.x + b1.width / 2
+    await page.mouse.move(b2.x + b2.width / 2, b2.y + 5)
+    await page.mouse.down()
+    await page.mouse.move(firstCenterX, b2.y + 5)
+    await page.mouse.up()
+
+    const f = await getBox(page, 0)
+    const s = await getBox(page, 1)
+    const sCenter = s.left + Math.round((await second.evaluate((n)=>parseInt((n as HTMLElement).style.width||'0',10))) / 2)
+    expect(Math.abs(sCenter - (f.left + f.width / 2))).toBeLessThanOrEqual(1)
+  })
+
+  test('when no nearby objects, grid snapping applies (13px → 16px)', async ({ page }) => {
+    await page.goto(wysiwygUrl)
+    const canvas = page.getByTestId('wysiwyg-canvas')
+    await expect(canvas).toBeVisible()
+
+    const addText = page.getByRole('button', { name: /^Add Text$/i })
+    await addText.click()
+
+    const obj = page.locator('[data-testid^="obj-text-"]').first()
+    const b = await obj.boundingBox()
+    if (!b) throw new Error('object not found')
+
+    const before = await getBox(page, 0)
+    await page.mouse.move(b.x + 5, b.y + 5)
+    await page.mouse.down()
+    await page.mouse.move(b.x + 5 + 13, b.y + 5)
+    await page.mouse.up()
+
+    const after = await getBox(page, 0)
+    expect(after.left - before.left).toBe(16)
+  })
+})