refactor: adjust runtime-dom test structure + tests for dom props

packages/runtime-dom/__tests__/patchClass.spec.ts

@@ -0,0 +1,31 @@
+import { patchProp } from '../src/patchProp'
+import { ElementWithTransition } from '../src/components/Transition'
+import { svgNS } from '../src/nodeOps'
+
+describe('runtime-dom: class patching', () => {
+  test('basics', () => {
+    const el = document.createElement('div')
+    patchProp(el, 'class', null, 'foo')
+    expect(el.className).toBe('foo')
+    patchProp(el, 'class', null, null)
+    expect(el.className).toBe('')
+  })
+
+  test('transition class', () => {
+    const el = document.createElement('div') as ElementWithTransition
+    el._vtc = new Set(['bar', 'baz'])
+    patchProp(el, 'class', null, 'foo')
+    expect(el.className).toBe('foo bar baz')
+    patchProp(el, 'class', null, null)
+    expect(el.className).toBe('bar baz')
+    delete el._vtc
+    patchProp(el, 'class', null, 'foo')
+    expect(el.className).toBe('foo')
+  })
+
+  test('svg', () => {
+    const el = document.createElementNS(svgNS, 'svg')
+    patchProp(el, 'class', null, 'foo', true)
+    expect(el.getAttribute('class')).toBe('foo')
+  })
+})