test: add e2e tests

fix: boolean attributes client side

src/client/batchUpdate.js

@@ -15,9 +15,7 @@ const startUpdate = (hasGlobalWindow ? window.requestAnimationFrame : null) || (
  * @return {Number} id - a new ID
  */
 export default function batchUpdate(id, callback) {
-  if (id) {
-    stopUpdate(id)
-  }
+  stopUpdate(id)
 
   return startUpdate(() => {
     id = null

src/client/updateClientMetaInfo.js

@@ -24,7 +24,7 @@ export default function updateClientMetaInfo(options = {}, newInfo) {
   const htmlTag = getTag(tags, 'html')
 
   // if this is a server render, then dont update
-  if (htmlTag.getAttribute(ssrAttribute)) {
+  if (htmlTag.hasAttribute(ssrAttribute)) {
     // remove the server render attribute so we can update on (next) changes
     htmlTag.removeAttribute(ssrAttribute)
     return false

src/client/updaters/attribute.js

@@ -1,3 +1,4 @@
+import { booleanHtmlAttributes } from '../../shared/constants'
 import isArray from '../../shared/isArray'
 
 /**
@@ -14,7 +15,9 @@ export default function updateAttribute({ attribute } = {}, attrs, tag) {
   const keepIndexes = []
   for (const attr in attrs) {
     if (attrs.hasOwnProperty(attr)) {
-      const value = isArray(attrs[attr]) ? attrs[attr].join(' ') : attrs[attr]
+      const value = booleanHtmlAttributes.includes(attr)
+        ? ''
+        : isArray(attrs[attr]) ? attrs[attr].join(' ') : attrs[attr]
 
       tag.setAttribute(attr, value || '')