test(ivy): enable more @angular/core tests (#27654)

PR Close #27654

packages/private/testing/src/ivy_test_selectors.ts

@@ -79,6 +79,24 @@ export function obsoleteInIvy(reason: string): JasmineMethods {
   return ivyEnabled ? IGNORE : PASSTHROUGH;
 }
 
+/**
+ * A function to conditionally skip the execution of tests that are not relevant when
+ * not running against Ivy.
+ *
+ * ```
+ * onlyInIvy('some reason').describe(...);
+ * ```
+ *
+ * or
+ *
+ * ```
+ * onlyInIvy('some reason').it(...);
+ * ```
+ */
+export function onlyInIvy(reason: string): JasmineMethods {
+  return ivyEnabled ? PASSTHROUGH : IGNORE;
+}
+
 /**
  * A function to conditionally skip the execution of tests that have intentionally
  * been broken when running against Ivy.