How do I trigger a ngModel model update in an Angular 2 unit test?
<p>I am attempting to test a component containing a text input element. I want to verify that the state of the component changes as expected when the value of the text input changes. The text input, of course, utilizes the ngModel directive (two-way binding).</p>

<p>Although the component works fine at runtime, I'm having trouble creating a valid, passing test. I have posted what I think should work below, and the test result following that.</p>

<p>What am I doing wrong?</p>

<p>TEST:</p>

<pre><code>import {Component} from 'angular2/core';
import {describe, it, injectAsync, TestComponentBuilder} from 'angular2/testing';
import {FORM_DIRECTIVES} from 'angular2/common';
import {By} from 'angular2/platform/common_dom';

class TestComponent {
    static get annotations() {
        return [
            new Component({
                template: '&lt;input type="text" [(ngModel)]="name" /&gt;&lt;p&gt;Hello {{name}}&lt;/p&gt;',
                directives: [FORM_DIRECTIVES]
            })
        ]
    }
}

describe('NgModel', () =&gt; {
    it('should update the model', injectAsync([TestComponentBuilder], tcb =&gt; {
        return tcb
            .createAsync(TestComponent)
            .then(fixture =&gt; {
                fixture.nativeElement.querySelector('input').value = 'John';
                const inputElement = fixture.debugElement.query(By.css('input'));
                inputElement.triggerEventHandler('input', { target: inputElement.nativeElement });
                fixture.detectChanges();
                expect(fixture.componentInstance.name).toEqual('John');
            });
    }));
});
</code></pre>

<p>OUTPUT:</p>

<pre><code>Chrome 45.0.2454 (Mac OS X 10.10.5) NgModel should update the model FAILED
    Expected undefined to equal 'John'.
        at /Users/nsaunders/Projects/ng2-esnext-seed/src/test/ngmodel.spec.js!transpiled:41:52
        at ZoneDelegate.invoke (/Users/nsaunders/Projects/ng2-esnext-seed/node_modules/angular2/bundles/angular2-polyfills.js:322:29)
        at Zone.run (/Users/nsaunders/Projects/ng2-esnext-seed/node_modules/angular2/bundles/angular2-polyfills.js:218:44)
        at /Users/nsaunders/Projects/ng2-esnext-seed/node_modules/angular2/bundles/angular2-polyfills.js:567:58
        at ZoneDelegate.invokeTask (/Users/nsaunders/Projects/ng2-esnext-seed/node_modules/angular2/bundles/angular2-polyfills.js:355:38)
        at Zone.runTask (/Users/nsaunders/Projects/ng2-esnext-seed/node_modules/angular2/bundles/angular2-polyfills.js:254:48)
        at drainMicroTaskQueue (/Users/nsaunders/Projects/ng2-esnext-seed/node_modules/angular2/bundles/angular2-polyfills.js:473:36)
        at XMLHttpRequest.ZoneTask.invoke (/Users/nsaunders/Projects/ng2-esnext-seed/node_modules/angular2/bundles/angular2-polyfills.js:425:22)
</code></pre>