From 684c8ff4d0ef2e5d7046195750ecc65d14a108a1 Mon Sep 17 00:00:00 2001
From: Christoph Tavan <dev@tavan.de>
Date: Mon, 28 Oct 2019 20:24:05 +0100
Subject: [PATCH] Add integration test to cover #7894

---
 .../pages/page-1.js                           |  2 +
 .../pages/page-2.js                           |  2 +
 .../test/index.test.js                        | 37 +++++++++++++++++++
 3 files changed, 41 insertions(+)
 create mode 100644 test/integration/build-firebase-only-sequentially/pages/page-1.js
 create mode 100644 test/integration/build-firebase-only-sequentially/pages/page-2.js
 create mode 100644 test/integration/build-firebase-only-sequentially/test/index.test.js

diff --git a/test/integration/build-firebase-only-sequentially/pages/page-1.js b/test/integration/build-firebase-only-sequentially/pages/page-1.js
new file mode 100644
index 0000000000000..dd9c28611eea2
--- /dev/null
+++ b/test/integration/build-firebase-only-sequentially/pages/page-1.js
@@ -0,0 +1,2 @@
+import 'firebase/firestore'
+export default () => <div>Firebase</div>
diff --git a/test/integration/build-firebase-only-sequentially/pages/page-2.js b/test/integration/build-firebase-only-sequentially/pages/page-2.js
new file mode 100644
index 0000000000000..dd9c28611eea2
--- /dev/null
+++ b/test/integration/build-firebase-only-sequentially/pages/page-2.js
@@ -0,0 +1,2 @@
+import 'firebase/firestore'
+export default () => <div>Firebase</div>
diff --git a/test/integration/build-firebase-only-sequentially/test/index.test.js b/test/integration/build-firebase-only-sequentially/test/index.test.js
new file mode 100644
index 0000000000000..c6ab580e20385
--- /dev/null
+++ b/test/integration/build-firebase-only-sequentially/test/index.test.js
@@ -0,0 +1,37 @@
+/* eslint-env jest */
+/* global jasmine */
+import path from 'path'
+import fs from 'fs-extra'
+import { nextBuild } from 'next-test-utils'
+
+jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000 * 60 * 1
+const appDir = path.join(__dirname, '..')
+const nextConfig = path.join(appDir, 'next.config.js')
+
+describe('Builds with firebase dependency only sequentially', () => {
+  it('Throws an error when building with firebase dependency in parallel', async () => {
+    await fs.writeFile(
+      nextConfig,
+      `module.exports = { experimental: { cpus: 2 } }`
+    )
+    const results = await nextBuild(appDir, [], { stdout: true, stderr: true })
+    expect(results.stdout + results.stderr).toMatch(/Build error occurred/)
+    expect(results.stdout + results.stderr).toMatch(
+      /grpc_node\.node\. Module did not self-register\./
+    )
+    await fs.remove(nextConfig)
+  })
+
+  it('Throws no error when building with firebase dependency in sequence', async () => {
+    await fs.writeFile(
+      nextConfig,
+      `module.exports = { experimental: { cpus: 1 } }`
+    )
+    const results = await nextBuild(appDir, [], { stdout: true, stderr: true })
+    expect(results.stdout + results.stderr).not.toMatch(/Build error occurred/)
+    expect(results.stdout + results.stderr).not.toMatch(
+      /grpc_node\.node\. Module did not self-register\./
+    )
+    await fs.remove(nextConfig)
+  })
+})