remove extra setup condition

run-tests.js

@@ -8,7 +8,6 @@ const fetch = vercelFetch(nodeFetch)
 const { promisify } = require('util')
 const { Sema } = require('async-sema')
 const { spawn, exec: execOrig } = require('child_process')
-const { createNextInstall } = require('./test/lib/create-next-install')
 const glob = promisify(_glob)
 const exec = promisify(execOrig)
 
@@ -33,9 +32,6 @@ const testFilters = {
 const configuredTestTypes = Object.values(testFilters)
 
 const cleanUpAndExit = async (code) => {
-  if (process.env.NEXT_TEST_STARTER) {
-    await fs.remove(process.env.NEXT_TEST_STARTER)
-  }
   console.log(`exiting with code ${code}`)
   process.exit(code)
 }
@@ -210,19 +206,6 @@ async function main() {
     )
   })
 
-  if ((testType && testType !== 'unit') || hasIsolatedTests) {
-    // for isolated next tests: e2e, dev, prod we create
-    // a starter Next.js install to re-use to speed up tests
-    // to avoid having to run yarn each time
-    console.log('Creating Next.js install for isolated tests')
-    const reactVersion = process.env.NEXT_TEST_REACT_VERSION || 'latest'
-    const testStarter = await createNextInstall({
-      react: reactVersion,
-      'react-dom': reactVersion,
-    })
-    process.env.NEXT_TEST_STARTER = testStarter
-  }
-
   const sema = new Sema(concurrency, { capacity: testNames.length })
   const jestPath = path.join(
     path.dirname(require.resolve('jest-cli/package.json')),

test/lib/next-modes/base.ts

@@ -81,13 +81,7 @@ export class NextInstance {
       `next-test-${Date.now()}-${(Math.random() * 1000) | 0}`
     )
 
-    if (
-      process.env.NEXT_TEST_STARTER &&
-      !this.dependencies &&
-      !this.installCommand
-    ) {
-      await fs.copy(process.env.NEXT_TEST_STARTER, this.testDir)
-    } else if (!skipIsolatedNext) {
+    if (!skipIsolatedNext) {
       const reactVersion = process.env.NEXT_TEST_REACT_VERSION || 'latest'
       const finalDependencies = {
         react: reactVersion,