Add tests

test/integration/export-progress-status-message/pages/index.js

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+export default () => <p>I am a home page</p>

test/integration/export-progress-status-message/test/index.test.js

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+/* eslint-env jest */
+
+import { join } from 'path'
+import { nextBuild, nextExportDefault } from 'next-test-utils'
+
+jest.setTimeout(1000 * 60 * 5)
+const appDir = join(__dirname, '../')
+
+describe('Export cli prints progress info', () => {
+  let buildStdout
+  let exportStdout
+  beforeAll(async () => {
+    const buildResult = await nextBuild(appDir, [], { stdout: true })
+    buildStdout = buildResult.stdout
+    const exportResult = await nextExportDefault(appDir, { stdout: true })
+    exportStdout = exportResult.stdout
+  })
+
+  it('build: should log with internally passed statusMessage', async () => {
+    const lines = buildStdout.split('\n')
+    // Search `info  - Generating static pages (n/m)` line
+    const found = lines.some((line) =>
+      /Generating static pages \(\d+\/\d+\)/.test(line)
+    )
+
+    expect(found).toBeTruthy()
+  })
+
+  it('export: should log with default label', async () => {
+    const lines = exportStdout.split('\n')
+    // Search `info  - Exporting (n/m)` line
+    const found = lines.some((line) => /Exporting \(\d+\/\d+\)/.test(line))
+
+    expect(found).toBeTruthy()
+  })
+})