move tests to tests folder

rename util modules
rename DbUpload to DbUploader
add tests for DbUploader component #27

tests/components/Chart.spec.js

@@ -0,0 +1,68 @@
+import { expect } from 'chai'
+import sinon from 'sinon'
+import { mount, shallowMount } from '@vue/test-utils'
+import Chart from '@/components/Chart.vue'
+import chart from '@/chart.js'
+import * as dereference from 'react-chart-editor/lib/lib/dereference'
+
+describe('Chart.vue', () => {
+  afterEach(() => {
+    sinon.restore()
+  })
+
+  it('getChartStateForSave called with proper arguments', () => {
+    // mount the component
+    const wrapper = shallowMount(Chart)
+    const vm = wrapper.vm
+    const stub = sinon.stub(chart, 'getChartStateForSave').returns('result')
+    const chartData = vm.getChartStateForSave()
+    expect(stub.calledOnceWith(vm.state, vm.dataSources)).to.equal(true)
+    expect(chartData).to.equal('result')
+  })
+
+  it('is not visible when visible is false', () => {
+    // mount the component
+    const wrapper = shallowMount(Chart, {
+      propsData: { visible: false }
+    })
+
+    expect(wrapper.find('.chart-container').isVisible()).to.equal(false)
+  })
+
+  it('is visible when visible is true', () => {
+    // mount the component
+    const wrapper = shallowMount(Chart, {
+      propsData: { visible: true }
+    })
+
+    expect(wrapper.find('.chart-container').isVisible()).to.equal(true)
+  })
+
+  it('emits update when plotly updates', async () => {
+    // mount the component
+    const wrapper = mount(Chart)
+    wrapper.findComponent({ ref: 'plotlyEditor' }).vm.$emit('onUpdate')
+    expect(wrapper.emitted('update')).to.have.lengthOf(1)
+  })
+
+  it('calls dereference when sqlResult is changed', async () => {
+    sinon.stub(dereference, 'default')
+    const sqlResult = {
+      columns: ['id', 'name'],
+      values: [[1, 'foo']]
+    }
+
+    // mount the component
+    const wrapper = shallowMount(Chart, {
+      propsData: { sqlResult: sqlResult }
+    })
+
+    const newSqlResult = {
+      columns: ['id', 'name'],
+      values: [[2, 'bar']]
+    }
+
+    await wrapper.setProps({ sqlResult: newSqlResult })
+    expect(dereference.default.called).to.equal(true)
+  })
+})