[web] Add tests for js/components/EventLog/EventList.jsx

web/src/js/__tests__/components/EventLog/EventListSpec.js

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+import React from 'react'
+import EventLogList from '../../../components/EventLog/EventList'
+import TestUtils from 'react-dom/test-utils'
+
+describe('EventList Component', () => {
+     let mockEventList = [
+            { id: 1, level: 'info', message: 'foo' },
+            { id: 2, level: 'error', message: 'bar' }
+        ],
+            eventLogList = TestUtils.renderIntoDocument(<EventLogList events={mockEventList}/>)
+
+    it('should render correctly', () => {
+        expect(eventLogList.state).toMatchSnapshot()
+        expect(eventLogList.props).toMatchSnapshot()
+    })
+
+    it('should handle componentWillUnmount', () => {
+        window.removeEventListener = jest.fn()
+        eventLogList.componentWillUnmount()
+        expect(window.removeEventListener).toBeCalledWith('resize', eventLogList.onViewportUpdate)
+    })
+})

web/src/js/__tests__/components/EventLog/__snapshots__/EventListSpec.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`EventList Component should render correctly 1`] = `
+Object {
+  "vScroll": Object {
+    "end": 1,
+    "paddingBottom": 18,
+    "paddingTop": 0,
+    "start": 0,
+  },
+}
+`;
+
+exports[`EventList Component should render correctly 2`] = `
+Object {
+  "events": Array [
+    Object {
+      "id": 1,
+      "level": "info",
+      "message": "foo",
+    },
+    Object {
+      "id": 2,
+      "level": "error",
+      "message": "bar",
+    },
+  ],
+  "rowHeight": 18,
+}
+`;