fix(runtime-dom): patch xlink attribute (#842)

packages/runtime-dom/__tests__/modules/attrs.spec.ts

@@ -0,0 +1,27 @@
+import { patchAttr, xlinkNS } from '../../src/modules/attrs'
+
+describe('attrs', () => {
+  test('xlink attributes', () => {
+    const el = document.createElementNS('http://www.w3.org/2000/svg', 'use')
+    patchAttr(el, 'xlink:href', 'a', true)
+    expect(el.getAttributeNS(xlinkNS, 'href')).toBe('a')
+    patchAttr(el, 'xlink:href', null, true)
+    expect(el.getAttributeNS(xlinkNS, 'href')).toBe(null)
+  })
+
+  test('boolean attributes', () => {
+    const el = document.createElement('input')
+    patchAttr(el, 'readonly', true, false)
+    expect(el.getAttribute('readonly')).toBe('')
+    patchAttr(el, 'readonly', false, false)
+    expect(el.getAttribute('readonly')).toBe(null)
+  })
+
+  test('attributes', () => {
+    const el = document.createElement('div')
+    patchAttr(el, 'id', 'a', false)
+    expect(el.getAttribute('id')).toBe('a')
+    patchAttr(el, 'id', null, false)
+    expect(el.getAttribute('id')).toBe(null)
+  })
+})