test: reset globalThis.__import_unsupported between tests

Author: pieh

tests/test-setup.ts

@@ -4,6 +4,16 @@ import { type FixtureTestContext } from './utils/contexts'
 
 // cleanup after each test as a fallback if someone forgot to call it
 afterEach<FixtureTestContext>(async ({ cleanup }) => {
+  // https://github.com/vercel/next.js/blob/668f8edb0ea47d578c6389a1d6df8fe902dec55c/packages/next/src/server/web/globals.ts#L90-L96
+  // Next defines non-configurable property on globalThis which we can't delete and without deletion it cause "Cannot redefine property"
+  // errors. So to be able to run tests from multiple fixtures we recreate globalThis without __import_unsupported property.
+  const newGlobalThisWithoutImportUnsupported = {}
+  const globalProps = Object.getOwnPropertyDescriptors(globalThis)
+  delete globalProps.__import_unsupported
+  Object.defineProperties(newGlobalThisWithoutImportUnsupported, globalProps)
+  // @ts-ignore it seems we can assign globalThis despite TS error
+  globalThis = newGlobalThisWithoutImportUnsupported
+
   if ('reset' in fs) {
     ;(fs as any).reset()
   }