test: split basic HMR test into multiple files (vercel#79064)

Split long-running basic hmr test to parallelize and reduce CI time.

As @huozhi mentioned at vercel#73613 (review), the tests won't be separated to `__test__` dir but flattened out on the same level as the fixture dirs.

Port of vercel#73616, confirmed no new changes.

x-ref: https://github.com/vercel/next.js/commits/canary/test/development/basic/hmr/basic.test.ts

Author: devjiwonchoi

test/development/basic/hmr/basic-no-base-path-no-asset-prefix.test.ts

@@ -0,0 +1,7 @@
+import { runBasicHmrTest } from './run-basic-hmr-test.util'
+
+const nextConfig = { basePath: '', assetPrefix: '' }
+
+describe(`HMR - basic, nextConfig: ${JSON.stringify(nextConfig)}`, () => {
+  runBasicHmrTest(nextConfig)
+})

test/development/basic/hmr/basic-no-base-path-yes-asset-prefix.test.ts

@@ -0,0 +1,7 @@
+import { runBasicHmrTest } from './run-basic-hmr-test.util'
+
+const nextConfig = { basePath: '', assetPrefix: '/asset-prefix' }
+
+describe(`HMR - basic, nextConfig: ${JSON.stringify(nextConfig)}`, () => {
+  runBasicHmrTest(nextConfig)
+})

test/development/basic/hmr/basic-yes-base-path-no-asset-prefix.test.ts

@@ -0,0 +1,7 @@
+import { runBasicHmrTest } from './run-basic-hmr-test.util'
+
+const nextConfig = { basePath: '/docs', assetPrefix: '' }
+
+describe(`HMR - basic, nextConfig: ${JSON.stringify(nextConfig)}`, () => {
+  runBasicHmrTest(nextConfig)
+})

test/development/basic/hmr/basic-yes-base-path-yes-asset-prefix.test.ts

@@ -0,0 +1,7 @@
+import { runBasicHmrTest } from './run-basic-hmr-test.util'
+
+const nextConfig = { basePath: '/docs', assetPrefix: '/asset-prefix' }
+
+describe(`HMR - basic, nextConfig: ${JSON.stringify(nextConfig)}`, () => {
+  runBasicHmrTest(nextConfig)
+})

test/development/basic/hmr/basic.test.ts renamed to test/development/basic/hmr/run-basic-hmr-test.util.ts

@@ -5,14 +5,11 @@ import {
   waitFor,
 } from 'next-test-utils'
 import { createNext, nextTestSetup } from 'e2e-utils'
-import type { NextConfig } from 'next'
-
-describe.each([
-  { basePath: '', assetPrefix: '' },
-  { basePath: '', assetPrefix: '/asset-prefix' },
-  { basePath: '/docs', assetPrefix: '' },
-  { basePath: '/docs', assetPrefix: '/asset-prefix' },
-])('basic HMR, nextConfig: %o', (nextConfig: Partial<NextConfig>) => {
+
+export function runBasicHmrTest(nextConfig: {
+  basePath: string
+  assetPrefix: string
+}) {
   const { next } = nextTestSetup({
     files: __dirname,
     nextConfig,
@@ -113,4 +110,4 @@ describe.each([
     await reloadPromise
     await secondNext.destroy()
   })
-})
+}