test: fix canary integration tests (#484)

* test: allow older react for canary

* test: allow older react for canary 2

Author: pieh

tests/prepare.mjs

@@ -45,7 +45,7 @@ const promises = fixtures.map((fixture) =>
     }
 
     // npm is the default
-    let cmd = `npm install --no-audit --progress=false --prefer-offline `
+    let cmd = `npm install --no-audit --progress=false --prefer-offline --legacy-peer-deps`
     const { packageManager } = JSON.parse(await readFile(join(cwd, 'package.json'), 'utf8'))
     if (packageManager?.startsWith('pnpm')) {
       // We disable frozen-lockfile because we may have changed the version of Next.js

tests/utils/fixture.ts

@@ -44,7 +44,10 @@ async function installDependencies(cwd: string) {
       cwd,
     })
   }
-  return execaCommand(`npm install --ignore-scripts --no-audit --progress=false`, { cwd })
+  return execaCommand(
+    `npm install --ignore-scripts --no-audit --progress=false --legacy-peer-deps`,
+    { cwd },
+  )
 }
 
 export const getFixtureSourceDirectory = (fixture: string) =>