angular - Angular2 unit testing does not update input's ngModel when used inside a form -


i have extensive testing in our angular 2.4 based application. 1 area have not been able test though forms inputs. tracked down small test case. have plnkr shows issue: https://plnkr.co/edit/nyeaoh2uo5rjt9if6j64 (see form_bug.spec.ts)

note: based example off way code in testing guide works.

the problem when hook input ngmodel, , in test suite update input data flow component if input not inside form. if add form, data not flow correctly.

the core pieces of code are:

@component({    selector: 'with-form-test',    template: `    <div>       <div class="show_val">{{testval}}</div>       <form>          <input name="test_val" id="val_id" [(ngmodel)]="testval" />       </form>    </div>    `, }) class withformtestcomp {    testval: string = 'start'; }

and test. 2 expect() checks in 1 fail.

describe('withformtest', () => {    let fixture: componentfixture<withformtestcomp>;    let comp:    withformtestcomp;    let comp_de: debugelement;     function getinput(): debugelement {       return comp_de.query(by.css('input'));    }    function getshowval(): debugelement {       return comp_de.query(by.css('.show_val'));    }     beforeeach(() => {       testbed.configuretestingmodule({          imports: [             formsmodule,          ],          declarations: [             withformtestcomp,          ],       });        fixture = testbed.createcomponent(withformtestcomp);       comp    = fixture.componentinstance;       comp_de = fixture.debugelement;    });     it('should update testval', () => {       fixture.detectchanges();       const input_elt: htmlinputelement = getinput().nativeelement;        input_elt.value = 'set_val';       input_elt.dispatchevent(newevent('input'));       fixture.detectchanges();        const show_val_elt = getshowval().nativeelement;        expect(comp.testval).toequal('set_val');       expect(show_val_elt.textcontent).tobe('set_val');    });  });

does see how fix work correctly? have looked around , can't find bug reports explain why work without form fail it.


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