fix(nextjs): do not generate spec files if unitTestRunner is not set …

…programmatically (#28733)

This PR fixes an issue where `create-nx-workspace` with Next.js preset
generates with Jest spec files, but does not install
`@testing-library/react` correctly due to not checking the normalized
schema file.

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## Current Behavior
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Fixes #

packages/next/src/generators/application/application.spec.ts

@@ -444,6 +444,9 @@ describe('app', () => {
     expect(tree.read(`${name}/jest.config.ts`, 'utf-8')).toContain(
       `moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx'],`
     );
+    expect(
+      readJson(tree, 'package.json').devDependencies['@testing-library/react']
+    ).toBeDefined();
   });
 
   it('should setup jest with SVGR support', async () => {

packages/next/src/generators/application/application.ts

@@ -104,7 +104,7 @@ export async function applicationGeneratorInternal(host: Tree, schema: Schema) {
       '@types/react-dom': typesReactDomVersion,
     };
 
-    if (schema.unitTestRunner && schema.unitTestRunner !== 'none') {
+    if (options.unitTestRunner && options.unitTestRunner !== 'none') {
       devDependencies['@testing-library/react'] = testingLibraryReactVersion;
     }