add options el tests (#2967)

* add options el tests

ref: #2872

* fix error at phantomjs env

test/unit/features/options/el.spec.js

@@ -0,0 +1,65 @@
+import Vue from 'vue'
+
+describe('Options el', () => {
+  it('basic usage', () => {
+    const el = document.createElement('div')
+    el.innerHTML = '<span>{{message}}</span>'
+    const vm = new Vue({
+      el,
+      data: { message: 'hello world' }
+    })
+    expect(vm.$el.tagName).toBe('DIV')
+    expect(vm.$el.textContent).toBe(vm.message)
+  })
+
+  it('should be replaced when use togther with `template` option', () => {
+    const el = document.createElement('div')
+    el.innerHTML = '<span>{{message}}</span>'
+    const vm = new Vue({
+      el,
+      template: '<p id="app"><span>{{message}}</span></p>',
+      data: { message: 'hello world' }
+    })
+    expect(vm.$el.tagName).toBe('P')
+    expect(vm.$el.textContent).toBe(vm.message)
+  })
+
+  it('should be replaced when use togther with `render` option', () => {
+    const el = document.createElement('div')
+    el.innerHTML = '<span>{{message}}</span>'
+    const vm = new Vue({
+      el,
+      render () {
+        const h = this.$createElement
+        return h('p', { staticAttrs: { id: 'app' }}, [
+          h('span', {}, [this.message])
+        ])
+      },
+      data: { message: 'hello world' }
+    })
+    expect(vm.$el.tagName).toBe('P')
+    expect(vm.$el.textContent).toBe(vm.message)
+  })
+
+  it('svg element', () => {
+    const ns = 'http://www.w3.org/2000/svg'
+    const el = document.createElementNS(ns, 'svg')
+    const text = document.createElementNS(ns, 'text')
+    text.setAttribute(':x', 'x')
+    text.setAttribute(':y', 'y')
+    text.setAttribute(':fill', 'color')
+    text.textContent = '{{text}}'
+    el.appendChild(text)
+    const vm = new Vue({
+      el,
+      data: {
+        x: 64, y: 128, color: 'red', text: 'svg text'
+      }
+    })
+    expect(vm.$el.tagName).toBe('svg')
+    expect(vm.$el.childNodes[0].getAttribute('x')).toBe(vm.x.toString())
+    expect(vm.$el.childNodes[0].getAttribute('y')).toBe(vm.y.toString())
+    expect(vm.$el.childNodes[0].getAttribute('fill')).toBe(vm.color)
+    expect(vm.$el.childNodes[0].textContent).toBe(vm.text)
+  })
+})