add tests for masonry grid

webapp/components/MasonryGrid/MasonryGrid.spec.js

@@ -0,0 +1,23 @@
+import { shallowMount } from '@vue/test-utils'
+import MasonryGrid from './MasonryGrid'
+
+describe('MasonryGrid', () => {
+  let wrapper
+
+  beforeEach(() => {
+    wrapper = shallowMount(MasonryGrid)
+  })
+
+  it('adds the "reset-grid-height" class when one or more children are updating', () => {
+    wrapper.trigger('calculating-item-height')
+
+    expect(wrapper.classes()).toContain('reset-grid-height')
+  })
+
+  it('removes the "reset-grid-height" class when all children have completed updating', () => {
+    wrapper.setData({ itemsCalculating: 1 })
+    wrapper.trigger('finished-calculating-item-height')
+
+    expect(wrapper.classes()).not.toContain('reset-grid-height')
+  })
+})