Add test for development output

test/integration/config-empty/test/index.test.js

@@ -1,20 +1,44 @@
 /* eslint-env jest */
 /* global jasmine */
 import { join } from 'path'
-import { nextBuild } from 'next-test-utils'
+import {
+  nextBuild,
+  launchApp,
+  findPort,
+  killApp,
+  waitFor,
+} from 'next-test-utils'
 
-jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000 * 60 * 5
+jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000 * 60 * 2
+
+const appDir = join(__dirname, '..')
 
 describe('Empty configuration', () => {
-  it('should show relevant warning and compile successfully', async () => {
-    const { stderr, stdout } = await nextBuild(join(__dirname, '..'), [], {
+  it('should show relevant warning and compile successfully for next build', async () => {
+    const { stderr, stdout } = await nextBuild(appDir, [], {
       stderr: true,
       stdout: true,
     })
+    expect(stdout).toMatch(/Compiled successfully./)
+    expect(stderr).toMatch(
+      /Warning: Detected next.config.js, no exported configuration found./
+    )
+  })
+
+  it('should show relevant warning and compile successfully for next dev', async () => {
+    let stderr = ''
+
+    const appPort = await findPort()
+    const app = await launchApp(appDir, appPort, {
+      onStderr(msg) {
+        stderr += msg || ''
+      },
+    })
+    await waitFor(1000)
+    await killApp(app)
 
     expect(stderr).toMatch(
       /Warning: Detected next.config.js, no exported configuration found./
     )
-    expect(stdout).toMatch(/Compiled successfully./)
   })
 })