test(store): selectSignal immutable state update trigger (#3882)

modules/store/spec/integration_signals.spec.ts

@@ -12,6 +12,7 @@ import {
   VisibilityFilters,
   resetId,
 } from './fixtures/todos';
+import { computed } from '@angular/core';
 
 interface Todo {
   id: number;
@@ -130,4 +131,30 @@ describe('NgRx and Signals Integration spec', () => {
       expect(error).toBeUndefined();
     });
   });
+
+  describe('immutable state integration spec', () => {
+    it('Store.selectSignal should not trigger on unrelated global state changes', () => {
+      let todosTriggerCount = 0;
+
+      const todos = TestBed.runInInjectionContext(() =>
+        store.selectSignal((state) => state.todos)
+      );
+
+      const todosTriggerState = TestBed.runInInjectionContext(() =>
+        computed(() => {
+          todos();
+          return ++todosTriggerCount;
+        })
+      );
+
+      store.dispatch({ type: ADD_TODO, payload: { text: 'first todo' } });
+      expect(todosTriggerState()).toBe(1);
+
+      store.dispatch({
+        type: SET_VISIBILITY_FILTER,
+        payload: VisibilityFilters.SHOW_ACTIVE,
+      });
+      expect(todosTriggerState()).toBe(1);
+    });
+  });
 });