🐛 Fix tests

Signed-off-by: Jakub Juszczak <netghost03@gmail.com>

test/unit/specs/Doughnut.spec.js

@@ -2,16 +2,30 @@ import Vue from 'vue'
 import DoughnutChart from 'src/examples/DoughnutExample'
 
 describe('DoughnutChart', () => {
+  let el
+
+  beforeEach(() => {
+    el = document.createElement('div')
+  })
+
   it('should render a canvas', () => {
     const vm = new Vue({
-      el: 'body',
-      replace: false,
       template: '<doughnut-chart></doughnut-chart>',
       components: { DoughnutChart }
-    })
+    }).$mount(el)
+
     expect(vm.$el.querySelector('#doughnut-chart')).not.to.be.an('undefined')
     expect(vm.$el.querySelector('canvas')).not.to.be.an('undefined')
     expect(vm.$el.querySelector('canvas')).not.to.be.an('null')
     expect(vm.$el.querySelector('canvas')).to.exist
   })
+
+  it('should change id based on prop', () => {
+    const vm = new Vue({
+      template: '<doughnut-chart chartId="doughnutchartprop"></doughnut-chart>',
+      components: { DoughnutChart }
+    }).$mount(el)
+
+    expect(vm.$el.querySelector('#doughnutchartprop')).not.to.be.an('undefined')
+  })
 })