test(ivy): more precise TestBed failure causes for View/Content Queries (FW-670) (#27447)

PR Close #27447

packages/compiler-cli/test/ngtsc/ngtsc_spec.ts

@@ -968,4 +968,82 @@ describe('ngtsc behavioral tests', () => {
     const jsContents = env.getContents('test.js');
     expect(jsContents).toMatch(/directives: \[DirA,\s+DirB\]/);
   });
+
+  describe('duplicate local refs', () => {
+    const getComponentScript = (template: string): string => `
+      import {Component, Directive, NgModule} from '@angular/core';
+
+      @Component({selector: 'my-cmp', template: \`${template}\`})
+      class Cmp {}
+
+      @NgModule({declarations: [Cmp]})
+      class Module {}
+    `;
+
+    // Components with templates listed below should
+    // throw the "ref is already defined" error
+    const invalidCases = [
+      `
+        <div #ref></div>
+        <div #ref></div>
+      `,
+      `
+        <div #ref>
+          <div #ref></div>
+        </div>
+      `,
+      `
+        <div>
+          <div #ref></div>
+        </div>
+        <div>
+          <div #ref></div>
+        </div>
+      `,
+      `
+        <ng-container>
+          <div #ref></div>
+        </ng-container>
+        <div #ref></div>
+      `
+    ];
+
+    // Components with templates listed below should not throw
+    // the error, since refs are located in different scopes
+    const validCases = [
+      `
+        <ng-template>
+          <div #ref></div>
+        </ng-template>
+        <div #ref></div>
+      `,
+      `
+        <div *ngIf="visible" #ref></div>
+        <div #ref></div>
+      `,
+      `
+        <div *ngFor="let item of items" #ref></div>
+        <div #ref></div>
+      `
+    ];
+
+    invalidCases.forEach(template => {
+      it('should throw in case of duplicate refs', () => {
+        env.tsconfig();
+        env.write('test.ts', getComponentScript(template));
+        const errors = env.driveDiagnostics();
+        expect(errors[0].messageText)
+            .toContain('Internal Error: The name ref is already defined in scope');
+      });
+    });
+
+    validCases.forEach(template => {
+      it('should not throw in case refs are in different scopes', () => {
+        env.tsconfig();
+        env.write('test.ts', getComponentScript(template));
+        const errors = env.driveDiagnostics();
+        expect(errors.length).toBe(0);
+      });
+    });
+  });
 });