add test for chart helper

src/views/Main/Workspace/Tabs/Tab/index.vue

@@ -59,7 +59,9 @@ import Teleport from 'vue2-teleport'
 
 export default {
   name: 'Tab',
-  props: ['id', 'initName', 'initQuery', 'initViewOptions', 'tabIndex', 'isPredefined', 'initViewType'],
+  props: [
+    'id', 'initName', 'initQuery', 'initViewOptions', 'tabIndex', 'isPredefined', 'initViewType'
+  ],
   components: {
     SqlEditor,
     DataView,

tests/lib/chartHelper.spec.js

@@ -53,4 +53,18 @@ describe('chartHelper.js', () => {
 
     expect(ds).to.equal(JSON.parse.returnValues[0])
   })
+
+  it('getImageDataUrl returns dataUrl', async () => {
+    const element = document.createElement('div')
+    const child = document.createElement('div')
+    element.append(child)
+    child.classList.add('js-plotly-plot')
+
+    let url = await chartHelper.getImageDataUrl(element, 'png')
+    expect(/^data:image\/png/.test(url)).to.equal(true)
+
+    url = await chartHelper.getImageDataUrl(element, 'svg')
+    console.log()
+    expect(/^data:image\/svg\+xml/.test(url)).to.equal(true)
+  })
 })