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Kristiyan Kostadinov
bbbd357bd2
Adds the `isFieldTree` utility that allows users to assert whether a value is a field tree. This is something that has come up on Material recently and will be useful for users as well.
Fixes #69984.
(cherry picked from commit 2a141847a5)
41 lines
1.2 KiB
TypeScript
41 lines
1.2 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {Component, signal} from '@angular/core';
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import {TestBed} from '@angular/core/testing';
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import {form, isFieldTree} from '../../public_api';
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describe('assertions', () => {
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it('should detect field trees', () => {
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@Component({template: ''})
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class App {
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readonly form = form(
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signal({
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firstName: 'Frodo',
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lastName: 'Baggins',
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}),
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);
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}
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const fixture = TestBed.createComponent(App);
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const tree = fixture.componentInstance.form;
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expect(isFieldTree(tree)).toBe(true);
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expect(isFieldTree(tree().fieldTree)).toBe(true);
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});
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it('should distinguish non-field-tree values from field trees', () => {
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expect(isFieldTree(true)).toBe(false);
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expect(isFieldTree(1)).toBe(false);
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expect(isFieldTree({})).toBe(false);
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expect(isFieldTree(() => 123)).toBe(false);
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expect(isFieldTree(null)).toBe(false);
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expect(isFieldTree(undefined)).toBe(false);
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expect(isFieldTree(signal(1))).toBe(false);
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});
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});
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