first commit

test/integration/compression/pages/index.js

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+export default () => <div id="hello">OK</div>

test/integration/compression/test/index.test.ts

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+/* eslint-env jest */
+
+import { join } from 'path'
+import {
+  fetchViaHTTP,
+  renderViaHTTP,
+  findPort,
+  launchApp,
+  killApp,
+} from 'next-test-utils'
+
+const context: Record<string, any> = {}
+
+describe('Compression', () => {
+  beforeAll(async () => {
+    context.appPort = await findPort()
+    context.server = await launchApp(join(__dirname, '../'), context.appPort)
+
+    // pre-build page at the start
+    await renderViaHTTP(context.appPort, '/')
+  })
+  afterAll(() => killApp(context.server))
+
+  it('should compress responses by default', async () => {
+    const res = await fetchViaHTTP(context.appPort, '/')
+
+    expect(res.headers.get('content-encoding')).toMatch(/gzip/)
+  })
+})