first commit

test/integration/empty-object-getInitialProps/pages/another.js

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+const Another = () => 'hi'
+
+Another.getInitialProps = () => ({})
+
+export default Another

test/integration/empty-object-getInitialProps/pages/index.js

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+const Index = () => 'hi'
+
+Index.getInitialProps = () => ({})
+
+export default Index

test/integration/empty-object-getInitialProps/pages/static.js

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+export default () => 'hi'

test/integration/empty-object-getInitialProps/test/index.test.ts

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+/* eslint-env jest */
+
+import { join } from 'path'
+import webdriver from 'next-webdriver'
+import {
+  renderViaHTTP,
+  findPort,
+  launchApp,
+  killApp,
+  waitFor,
+  check,
+} from 'next-test-utils'
+
+const appDir = join(__dirname, '..')
+let output = ''
+let appPort
+let app
+
+const handleOutput = (msg) => {
+  output += msg
+}
+
+describe('Empty Project', () => {
+  beforeAll(async () => {
+    appPort = await findPort()
+    app = await launchApp(appDir, appPort, {
+      onStdout: handleOutput,
+      onStderr: handleOutput,
+    })
+  })
+  afterAll(() => killApp(app))
+
+  it('It should show empty object warning on SSR', async () => {
+    output = ''
+    await renderViaHTTP(appPort, '/')
+    await waitFor(100)
+    expect(output).toMatch(/returned an empty object from `getInitialProps`/)
+  })
+
+  it('It should not show empty object warning for page without `getInitialProps`', async () => {
+    output = ''
+    await renderViaHTTP(appPort, '/static')
+    await waitFor(100)
+    expect(output).not.toMatch(
+      /returned an empty object from `getInitialProps`/
+    )
+  })
+
+  it('should show empty object warning during client transition', async () => {
+    const browser = await webdriver(appPort, '/static')
+    try {
+      await browser.eval(`(function() {
+        window.gotWarn = false
+        const origWarn = console.warn
+        window.console.warn = function () {
+          if (arguments[0].match(/returned an empty object from \`getInitialProps\`/)) {
+            window.gotWarn = true
+          }
+          origWarn.apply(this, arguments)
+        }
+        window.next.router.replace('/another')
+      })()`)
+      await check(async () => {
+        const gotWarn = await browser.eval(`window.gotWarn`)
+        return gotWarn ? 'pass' : 'fail'
+      }, 'pass')
+    } finally {
+      await browser.close()
+    }
+  })
+})