fix(testing): improve misleading error message when don't call compileComponents (#13543)

Closes #11301

modules/@angular/core/testing/test_bed.ts

@@ -267,7 +267,7 @@ export class TestBed implements Injector {
       } catch (e) {
         if (e.compType) {
           throw new Error(
-              `This test module uses the component ${stringify(e.compType)} which is using a "templateUrl", but they were never compiled. ` +
+              `This test module uses the component ${stringify(e.compType)} which is using a "templateUrl" or "styleUrls", but they were never compiled. ` +
               `Please call "TestBed.compileComponents" before your test.`);
         } else {
           throw e;