Add a smiple test to confirm Boostnote starts

tests/e2e/spectron-test.js

@@ -0,0 +1,31 @@
+import test from 'ava'
+import {Application} from 'spectron'
+import path from 'path'
+
+test.beforeEach(async t => {
+  t.context.app = new Application({
+    path: path.join('..', '..', 'dist', 'Boostnote-darwin-x64', 'Boostnote.app', 'Contents', 'MacOS', 'Boostnote')
+  })
+
+  await t.context.app.start()
+})
+
+test.afterEach.always(async t => {
+  await t.context.app.stop()
+})
+
+test(async t => {
+  const app = t.context.app
+  await app.client.waitUntilWindowLoaded()
+
+  const win = app.browserWindow
+  t.is(await app.client.getWindowCount(), 1)
+  t.false(await win.isMinimized())
+  t.false(await win.isDevToolsOpened())
+  t.true(await win.isVisible())
+  t.true(await win.isFocused())
+
+  const {width, height} = await win.getBounds()
+  t.true(width > 0)
+  t.true(height > 0)
+})