move tests to tests folder

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

tests/components/LoadingIndicator.spec.js

@@ -0,0 +1,24 @@
+import { expect } from 'chai'
+import { shallowMount } from '@vue/test-utils'
+import LoadingIndicator from '@/components/LoadingIndicator.vue'
+
+describe('LoadingIndicator.vue', () => {
+  it('Calculates animation class', async () => {
+    const wrapper = shallowMount(LoadingIndicator, {
+      propsData: { progress: 0 }
+    })
+    expect(wrapper.find('svg').classes()).to.contain('progress')
+    await wrapper.setProps({ progress: undefined })
+    expect(wrapper.find('svg').classes()).to.not.contain('progress')
+    expect(wrapper.find('svg').classes()).to.contain('loading')
+  })
+
+  it('Calculates arc', async () => {
+    const wrapper = shallowMount(LoadingIndicator, {
+      propsData: { progress: 50 }
+    })
+    // The lendth of circle in the component is 50.24. If progress is 50% then resulting arc
+    // should be 25.12
+    expect(wrapper.find('.loader-svg.front').element.style.strokeDasharray).to.equal('25.12, 25.12')
+  })
+})