fix(@schematics/angular): align Karma project generation with unified unit-test builder

Updates the application and ng-new schematics to correctly configure Karma-based projects.

- The test target in the generated angular.json now uses the `@angular/build:unit-test` builder.
- The builder options are simplified to only include runner: 'karma', as other settings are now handled by the unified builder.
- Corresponding schematic tests have been updated to reflect these changes.

Author: clydin

packages/schematics/angular/application/index.ts

@@ -396,13 +396,9 @@ function addAppToWorkspaceFile(options: ApplicationOptions, appDir: string): Rul
                 options: {},
               }
             : {
-                builder: Builders.BuildKarma,
+                builder: Builders.BuildUnitTest,
                 options: {
-                  polyfills: options.zoneless ? undefined : ['zone.js', 'zone.js/testing'],
-                  tsConfig: `${projectRoot}tsconfig.spec.json`,
-                  inlineStyleLanguage,
-                  assets: [{ 'glob': '**/*', 'input': `${projectRoot}public` }],
-                  styles: [`${sourceRoot}/styles.${options.style}`],
+                  runner: 'karma',
                 },
               },
     },

packages/schematics/angular/application/index_spec.ts

@@ -448,10 +448,11 @@ describe('Application Schematic', () => {
       const config = JSON.parse(tree.readContent('/angular.json'));
       const prj = config.projects.foo;
       const testOpt = prj.architect.test;
-      expect(testOpt.builder).toEqual('@angular/build:karma');
-      expect(testOpt.options.tsConfig).toEqual('tsconfig.spec.json');
-      expect(testOpt.options.assets).toEqual([{ glob: '**/*', input: 'public' }]);
-      expect(testOpt.options.styles).toEqual(['src/styles.css']);
+      expect(testOpt.builder).toEqual('@angular/build:unit-test');
+      expect(testOpt.options.runner).toEqual('karma');
+      expect(testOpt.options.tsConfig).toBeUndefined();
+      expect(testOpt.options.assets).toBeUndefined();
+      expect(testOpt.options.styles).toBeUndefined();
     });
 
     it('should set the relative tsconfig paths', async () => {

packages/schematics/angular/ng-new/index_spec.ts

@@ -169,7 +169,8 @@ describe('Ng New Schematic', () => {
         },
       },
     } = JSON.parse(tree.readContent('/bar/angular.json'));
-    expect(test.builder).toBe('@angular/build:karma');
+    expect(test.builder).toBe('@angular/build:unit-test');
+    expect(test.options).toEqual({ runner: 'karma' });
 
     const { devDependencies } = JSON.parse(tree.readContent('/bar/package.json'));
     expect(devDependencies['karma']).toBeDefined();