form_control_spec.ts

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {fakeAsync, tick} from '@angular/core/testing';
import {FormArray, FormControl, FormGroup, Validators} from '@angular/forms';

import {asyncValidator, asyncValidatorReturningObservable} from './util';

(function() {
function otherAsyncValidator() {
  return Promise.resolve({'other': true});
}

function syncValidator(_: any /** TODO #9100 */): any /** TODO #9100 */ {
  return null;
}

describe('FormControl', () => {
  it('should default the value to null', () => {
    const c = new FormControl();
    expect(c.value).toBe(null);
  });

  describe('markAllAsTouched', () => {
    it('should mark only the control itself as touched', () => {
      const control = new FormControl('');
      expect(control.touched).toBe(false);
      control.markAllAsTouched();
      expect(control.touched).toBe(true);
    });
  });

  describe('boxed values', () => {
    it('should support valid boxed values on creation', () => {
      const c = new FormControl({value: 'some val', disabled: true}, null!, null!);
      expect(c.disabled).toBe(true);
      expect(c.value).toBe('some val');
      expect(c.status).toBe('DISABLED');
    });

    it('should not treat objects as boxed values when `disabled` field is present, but `value` is missing',
       () => {
         const c = new FormControl({disabled: true});
         expect(c.value).toEqual({disabled: true});
         expect(c.disabled).toBe(false);
       });

    it('should honor boxed value with disabled control when validating', () => {
      const c = new FormControl({value: '', disabled: true}, Validators.required);
      expect(c.disabled).toBe(true);
      expect(c.valid).toBe(false);
      expect(c.status).toBe('DISABLED');
    });

    it('should not treat objects as boxed values if they have more than two props', () => {
      const c: FormControl =
          new FormControl({value: '', disabled: true, test: 'test'} as any, null!, null!);
      expect(c.value).toEqual({value: '', disabled: true, test: 'test'});
      expect(c.disabled).toBe(false);
    });

    it('should not treat objects as boxed values if disabled is missing', () => {
      const c = new FormControl({value: '', test: 'test'}, null!, null!);
      expect(c.value).toEqual({value: '', test: 'test'});
      expect(c.disabled).toBe(false);
    });
  });

  describe('updateOn', () => {
    it('should default to on change', () => {
      const c = new FormControl('');
      expect(c.updateOn).toEqual('change');
    });

    it('should default to on change with an options obj', () => {
      const c = new FormControl('', {validators: Validators.required});
      expect(c.updateOn).toEqual('change');
    });

    it('should set updateOn when updating on blur', () => {
      const c = new FormControl('', {updateOn: 'blur'});
      expect(c.updateOn).toEqual('blur');
    });

    describe('in groups and arrays', () => {
      it('should default to group updateOn when not set in control', () => {
        const g =
            new FormGroup({one: new FormControl(), two: new FormControl()}, {updateOn: 'blur'});

        expect(g.get('one')!.updateOn).toEqual('blur');
        expect(g.get('two')!.updateOn).toEqual('blur');
      });

      it('should default to array updateOn when not set in control', () => {
        const a = new FormArray([new FormControl(), new FormControl()], {updateOn: 'blur'});

        expect(a.get([0])!.updateOn).toEqual('blur');
        expect(a.get([1])!.updateOn).toEqual('blur');
      });

      it('should set updateOn with nested groups', () => {
        const g = new FormGroup(
            {
              group: new FormGroup({one: new FormControl(), two: new FormControl()}),
            },
            {updateOn: 'blur'});

        expect(g.get('group.one')!.updateOn).toEqual('blur');
        expect(g.get('group.two')!.updateOn).toEqual('blur');
        expect(g.get('group')!.updateOn).toEqual('blur');
      });

      it('should set updateOn with nested arrays', () => {
        const g = new FormGroup(
            {
              arr: new FormArray([new FormControl(), new FormControl()]),
            },
            {updateOn: 'blur'});

        expect(g.get(['arr', 0])!.updateOn).toEqual('blur');
        expect(g.get(['arr', 1])!.updateOn).toEqual('blur');
        expect(g.get('arr')!.updateOn).toEqual('blur');
      });

      it('should allow control updateOn to override group updateOn', () => {
        const g = new FormGroup(
            {one: new FormControl('', {updateOn: 'change'}), two: new FormControl()},
            {updateOn: 'blur'});

        expect(g.get('one')!.updateOn).toEqual('change');
        expect(g.get('two')!.updateOn).toEqual('blur');
      });

      it('should set updateOn with complex setup', () => {
        const g = new FormGroup({
          group: new FormGroup(
              {one: new FormControl('', {updateOn: 'change'}), two: new FormControl()},
              {updateOn: 'blur'}),
          groupTwo: new FormGroup({one: new FormControl()}, {updateOn: 'submit'}),
          three: new FormControl()
        });

        expect(g.get('group.one')!.updateOn).toEqual('change');
        expect(g.get('group.two')!.updateOn).toEqual('blur');
        expect(g.get('groupTwo.one')!.updateOn).toEqual('submit');
        expect(g.get('three')!.updateOn).toEqual('change');
      });
    });
  });

  describe('validator', () => {
    it('should run validator with the initial value', () => {
      const c = new FormControl('value', Validators.required);
      expect(c.valid).toEqual(true);
    });

    it('should rerun the validator when the value changes', () => {
      const c = new FormControl('value', Validators.required);
      c.setValue(null);
      expect(c.valid).toEqual(false);
    });

    it('should support arrays of validator functions if passed', () => {
      const c = new FormControl('value', [Validators.required, Validators.minLength(3)]);
      c.setValue('a');
      expect(c.valid).toEqual(false);

      c.setValue('aaa');
      expect(c.valid).toEqual(true);
    });

    it('should support single validator from options obj', () => {
      const c: FormControl = new FormControl(null, {validators: Validators.required});
      expect(c.valid).toEqual(false);
      expect(c.errors).toEqual({required: true});

      c.setValue('value');
      expect(c.valid).toEqual(true);
    });

    it('should support multiple validators from options obj', () => {
      const c: FormControl =
          new FormControl(null, {validators: [Validators.required, Validators.minLength(3)]});
      expect(c.valid).toEqual(false);
      expect(c.errors).toEqual({required: true});

      c.setValue('aa');
      expect(c.valid).toEqual(false);
      expect(c.errors).toEqual({minlength: {requiredLength: 3, actualLength: 2}});

      c.setValue('aaa');
      expect(c.valid).toEqual(true);
    });

    it('should support a null validators value', () => {
      const c = new FormControl(null, {validators: null});
      expect(c.valid).toEqual(true);
    });

    it('should support an empty options obj', () => {
      const c = new FormControl(null, {});
      expect(c.valid).toEqual(true);
    });

    it('should return errors', () => {
      const c = new FormControl(null, Validators.required);
      expect(c.errors).toEqual({'required': true});
    });

    it('should set single validator', () => {
      const c: FormControl = new FormControl(null);
      expect(c.valid).toEqual(true);

      c.setValidators(Validators.required);

      c.setValue(null);
      expect(c.valid).toEqual(false);

      c.setValue('abc');
      expect(c.valid).toEqual(true);
    });

    it('should set multiple validators from array', () => {
      const c = new FormControl('');
      expect(c.valid).toEqual(true);

      c.setValidators([Validators.minLength(5), Validators.required]);

      c.setValue('');
      expect(c.valid).toEqual(false);

      c.setValue('abc');
      expect(c.valid).toEqual(false);

      c.setValue('abcde');
      expect(c.valid).toEqual(true);
    });

    it('should override validators using `setValidators` function', () => {
      const c = new FormControl('');
      expect(c.valid).toEqual(true);

      c.setValidators([Validators.minLength(5), Validators.required]);

      c.setValue('');
      expect(c.valid).toEqual(false);

      c.setValue('abc');
      expect(c.valid).toEqual(false);

      c.setValue('abcde');
      expect(c.valid).toEqual(true);

      // Define new set of validators, overriding previously applied ones.
      c.setValidators([Validators.maxLength(2)]);

      c.setValue('abcdef');
      expect(c.valid).toEqual(false);

      c.setValue('a');
      expect(c.valid).toEqual(true);
    });

    it('should override validators by setting `control.validator` field value', () => {
      const c = new FormControl('');
      expect(c.valid).toEqual(true);

      // Define new set of validators, overriding previously applied ones.
      c.validator = Validators.compose([Validators.minLength(5), Validators.required]);

      c.setValue('');
      expect(c.valid).toEqual(false);

      c.setValue('abc');
      expect(c.valid).toEqual(false);

      c.setValue('abcde');
      expect(c.valid).toEqual(true);

      // Define new set of validators, overriding previously applied ones.
      c.validator = Validators.compose([Validators.maxLength(2)]);

      c.setValue('abcdef');
      expect(c.valid).toEqual(false);

      c.setValue('a');
      expect(c.valid).toEqual(true);
    });

    it('should clear validators', () => {
      const c = new FormControl('', Validators.required);
      expect(c.valid).toEqual(false);

      c.clearValidators();
      expect(c.validator).toEqual(null);

      c.setValue('');
      expect(c.valid).toEqual(true);
    });

    it('should add after clearing', () => {
      const c = new FormControl('', Validators.required);
      expect(c.valid).toEqual(false);

      c.clearValidators();
      expect(c.validator).toEqual(null);

      c.setValidators([Validators.required]);
      expect(c.validator).not.toBe(null);
    });

    it('should check presence of and remove a validator set in the control constructor', () => {
      const c = new FormControl('', Validators.required);
      expect(c.hasValidator(Validators.required)).toEqual(true);

      c.removeValidators(Validators.required);
      expect(c.hasValidator(Validators.required)).toEqual(false);

      c.addValidators(Validators.required);
      expect(c.hasValidator(Validators.required)).toEqual(true);
    });

    it('should check presence of and remove a validator set with addValidators', () => {
      const c = new FormControl('');
      expect(c.hasValidator(Validators.required)).toEqual(false);
      c.addValidators(Validators.required);
      expect(c.hasValidator(Validators.required)).toEqual(true);

      c.removeValidators(Validators.required);
      expect(c.hasValidator(Validators.required)).toEqual(false);
    });

    it('should check presence of and remove multiple validators set at the same time', () => {
      const c = new FormControl('3');
      const minValidator = Validators.min(4);
      c.addValidators([Validators.required, minValidator]);
      expect(c.hasValidator(Validators.required)).toEqual(true);
      expect(c.hasValidator(minValidator)).toEqual(true);

      c.removeValidators([Validators.required, minValidator]);
      expect(c.hasValidator(Validators.required)).toEqual(false);
      expect(c.hasValidator(minValidator)).toEqual(false);
    });

    it('should be able to remove a validator added multiple times', () => {
      const c = new FormControl('', Validators.required);
      c.addValidators(Validators.required);
      c.addValidators(Validators.required);
      expect(c.hasValidator(Validators.required)).toEqual(true);

      c.removeValidators(Validators.required);
      expect(c.hasValidator(Validators.required)).toEqual(false);
    });

    it('should return false when checking presence of a validator not identical by reference',
       () => {
         const minValidator = Validators.min(5);
         const c = new FormControl('1', minValidator);
         expect(c.hasValidator(minValidator)).toEqual(true);
         expect(c.hasValidator(Validators.min(5))).toEqual(false);
       });
  });

  describe('asyncValidator', () => {
    it('should run validator with the initial value', fakeAsync(() => {
         const c = new FormControl('value', null!, asyncValidator('expected'));
         tick();

         expect(c.valid).toEqual(false);
         expect(c.errors).toEqual({'async': true});
       }));

    it('should support validators returning observables', fakeAsync(() => {
         const c = new FormControl('value', null!, asyncValidatorReturningObservable);
         tick();

         expect(c.valid).toEqual(false);
         expect(c.errors).toEqual({'async': true});
       }));

    it('should rerun the validator when the value changes', fakeAsync(() => {
         const c = new FormControl('value', null!, asyncValidator('expected'));

         c.setValue('expected');
         tick();

         expect(c.valid).toEqual(true);
       }));

    it('should run the async validator only when the sync validator passes', fakeAsync(() => {
         const c = new FormControl('', Validators.required, asyncValidator('expected'));
         tick();

         expect(c.errors).toEqual({'required': true});

         c.setValue('some value');
         tick();

         expect(c.errors).toEqual({'async': true});
       }));

    it('should mark the control as pending while running the async validation', fakeAsync(() => {
         const c = new FormControl('', null!, asyncValidator('expected'));

         expect(c.pending).toEqual(true);

         tick();

         expect(c.pending).toEqual(false);
       }));

    it('should only use the latest async validation run', fakeAsync(() => {
         const c =
             new FormControl('', null!, asyncValidator('expected', {'long': 200, 'expected': 100}));

         c.setValue('long');
         c.setValue('expected');

         tick(300);

         expect(c.valid).toEqual(true);
       }));

    it('should support arrays of async validator functions if passed', fakeAsync(() => {
         const c =
             new FormControl('value', null!, [asyncValidator('expected'), otherAsyncValidator]);
         tick();

         expect(c.errors).toEqual({'async': true, 'other': true});
       }));


    it('should support a single async validator from options obj', fakeAsync(() => {
         const c = new FormControl('value', {asyncValidators: asyncValidator('expected')});
         expect(c.pending).toEqual(true);
         tick();

         expect(c.valid).toEqual(false);
         expect(c.errors).toEqual({'async': true});
       }));

    it('should support multiple async validators from options obj', fakeAsync(() => {
         const c = new FormControl(
             'value', {asyncValidators: [asyncValidator('expected'), otherAsyncValidator]});
         expect(c.pending).toEqual(true);
         tick();

         expect(c.valid).toEqual(false);
         expect(c.errors).toEqual({'async': true, 'other': true});
       }));

    it('should support a mix of validators from options obj', fakeAsync(() => {
         const c = new FormControl(
             '', {validators: Validators.required, asyncValidators: asyncValidator('expected')});
         tick();
         expect(c.errors).toEqual({required: true});

         c.setValue('value');
         expect(c.pending).toBe(true);

         tick();
         expect(c.valid).toEqual(false);
         expect(c.errors).toEqual({'async': true});
       }));

    it('should add single async validator', fakeAsync(() => {
         const c = new FormControl('value', null!);

         c.setAsyncValidators(asyncValidator('expected'));
         expect(c.asyncValidator).not.toEqual(null);

         c.setValue('expected');
         tick();

         expect(c.valid).toEqual(true);
       }));

    it('should add async validator from array', fakeAsync(() => {
         const c = new FormControl('value', null!);

         c.setAsyncValidators([asyncValidator('expected')]);
         expect(c.asyncValidator).not.toEqual(null);

         c.setValue('expected');
         tick();

         expect(c.valid).toEqual(true);
       }));

    it('should override validators using `setAsyncValidators` function', fakeAsync(() => {
         const c = new FormControl('');
         expect(c.valid).toEqual(true);

         c.setAsyncValidators([asyncValidator('expected')]);

         c.setValue('');
         tick();
         expect(c.valid).toEqual(false);

         c.setValue('expected');
         tick();
         expect(c.valid).toEqual(true);

         // Define new set of validators, overriding previously applied ones.
         c.setAsyncValidators([asyncValidator('new expected')]);

         c.setValue('expected');
         tick();
         expect(c.valid).toEqual(false);

         c.setValue('new expected');
         tick();
         expect(c.valid).toEqual(true);
       }));

    it('should override validators by setting `control.asyncValidator` field value',
       fakeAsync(() => {
         const c = new FormControl('');
         expect(c.valid).toEqual(true);

         c.asyncValidator = Validators.composeAsync([asyncValidator('expected')]);

         c.setValue('');
         tick();
         expect(c.valid).toEqual(false);

         c.setValue('expected');
         tick();
         expect(c.valid).toEqual(true);

         // Define new set of validators, overriding previously applied ones.
         c.asyncValidator = Validators.composeAsync([asyncValidator('new expected')]);

         c.setValue('expected');
         tick();
         expect(c.valid).toEqual(false);

         c.setValue('new expected');
         tick();
         expect(c.valid).toEqual(true);
       }));

    it('should clear async validators', fakeAsync(() => {
         const c = new FormControl('value', [asyncValidator('expected'), otherAsyncValidator]);

         c.clearValidators();

         expect(c.asyncValidator).toEqual(null);
       }));

    it('should not change validity state if control is disabled while async validating',
       fakeAsync(() => {
         const c = new FormControl('value', [asyncValidator('expected')]);
         c.disable();
         tick();
         expect(c.status).toEqual('DISABLED');
       }));

    it('should check presence of and remove a validator set in the control constructor', () => {
      const asyncVal = asyncValidator('expected');
      const c = new FormControl('', null, asyncVal);
      expect(c.hasAsyncValidator(asyncVal)).toEqual(true);

      c.removeAsyncValidators(asyncVal);
      expect(c.hasAsyncValidator(asyncVal)).toEqual(false);

      c.addAsyncValidators(asyncVal);
      expect(c.hasAsyncValidator(asyncVal)).toEqual(true);
    });

    it('should check presence of and remove a validator set with addValidators', () => {
      const c = new FormControl('');
      const asyncVal = asyncValidator('expected');
      c.addAsyncValidators(asyncVal);
      expect(c.hasAsyncValidator(asyncVal)).toEqual(true);

      c.removeAsyncValidators(asyncVal);
      expect(c.hasAsyncValidator(asyncVal)).toEqual(false);
    });

    it('should check presence of and remove multiple validators set at the same time', () => {
      const c = new FormControl('3');
      const asyncVal1 = asyncValidator('expected1');
      const asyncVal2 = asyncValidator('expected2');
      c.addAsyncValidators([asyncVal1, asyncVal2]);
      expect(c.hasAsyncValidator(asyncVal1)).toEqual(true);
      expect(c.hasAsyncValidator(asyncVal2)).toEqual(true);

      c.removeAsyncValidators([asyncVal1, asyncVal2]);
      expect(c.hasAsyncValidator(asyncVal1)).toEqual(false);
      expect(c.hasAsyncValidator(asyncVal2)).toEqual(false);
    });

    it('should be able to remove a validator added multiple times', () => {
      const asyncVal = asyncValidator('expected');
      const c = new FormControl('', null, asyncVal);
      c.addAsyncValidators(asyncVal);
      c.addAsyncValidators(asyncVal);
      expect(c.hasAsyncValidator(asyncVal)).toEqual(true);

      c.removeAsyncValidators(asyncVal);
      expect(c.hasAsyncValidator(asyncVal)).toEqual(false);
    });

    it('should return false when checking presence of a validator not identical by reference',
       () => {
         const asyncVal = asyncValidator('expected');
         const asyncValDifferentFn = asyncValidator('expected');
         const c = new FormControl('1', null, asyncVal);
         expect(c.hasAsyncValidator(asyncVal)).toEqual(true);
         expect(c.hasAsyncValidator(asyncValDifferentFn)).toEqual(false);
       });
  });

  describe('dirty', () => {
    it('should be false after creating a control', () => {
      const c = new FormControl('value');
      expect(c.dirty).toEqual(false);
    });

    it('should be true after changing the value of the control', () => {
      const c = new FormControl('value');
      c.markAsDirty();
      expect(c.dirty).toEqual(true);
    });
  });

  describe('touched', () => {
    it('should be false after creating a control', () => {
      const c = new FormControl('value');
      expect(c.touched).toEqual(false);
    });

    it('should be true after markAsTouched runs', () => {
      const c = new FormControl('value');
      c.markAsTouched();
      expect(c.touched).toEqual(true);
    });
  });

  describe('setValue', () => {
    let g: FormGroup, c: FormControl;
    beforeEach(() => {
      c = new FormControl('oldValue');
      g = new FormGroup({'one': c});
    });

    it('should set the value of the control', () => {
      c.setValue('newValue');
      expect(c.value).toEqual('newValue');
    });

    it('should invoke ngOnChanges if it is present', () => {
      let ngOnChanges: any;
      c.registerOnChange((v: any) => ngOnChanges = ['invoked', v]);

      c.setValue('newValue');

      expect(ngOnChanges).toEqual(['invoked', 'newValue']);
    });

    it('should not invoke on change when explicitly specified', () => {
      let onChange: any = null;
      c.registerOnChange((v: any) => onChange = ['invoked', v]);

      c.setValue('newValue', {emitModelToViewChange: false});

      expect(onChange).toBeNull();
    });

    it('should set the parent', () => {
      c.setValue('newValue');
      expect(g.value).toEqual({'one': 'newValue'});
    });

    it('should not set the parent when explicitly specified', () => {
      c.setValue('newValue', {onlySelf: true});
      expect(g.value).toEqual({'one': 'oldValue'});
    });

    it('should fire an event', fakeAsync(() => {
         c.valueChanges.subscribe((value) => {
           expect(value).toEqual('newValue');
         });

         c.setValue('newValue');
         tick();
       }));

    it('should not fire an event when explicitly specified', fakeAsync(() => {
         c.valueChanges.subscribe((value) => {
           throw 'Should not happen';
         });

         c.setValue('newValue', {emitEvent: false});
         tick();
       }));

    it('should work on a disabled control', () => {
      g.addControl('two', new FormControl('two'));
      c.disable();
      c.setValue('new value');
      expect(c.value).toEqual('new value');
      expect(g.value).toEqual({'two': 'two'});
    });
  });

  describe('patchValue', () => {
    let g: FormGroup, c: FormControl;
    beforeEach(() => {
      c = new FormControl('oldValue');
      g = new FormGroup({'one': c});
    });

    it('should set the value of the control', () => {
      c.patchValue('newValue');
      expect(c.value).toEqual('newValue');
    });

    it('should invoke ngOnChanges if it is present', () => {
      let ngOnChanges: any;
      c.registerOnChange((v: any) => ngOnChanges = ['invoked', v]);

      c.patchValue('newValue');

      expect(ngOnChanges).toEqual(['invoked', 'newValue']);
    });

    it('should not invoke on change when explicitly specified', () => {
      let onChange: any = null;
      c.registerOnChange((v: any) => onChange = ['invoked', v]);

      c.patchValue('newValue', {emitModelToViewChange: false});

      expect(onChange).toBeNull();
    });

    it('should set the parent', () => {
      c.patchValue('newValue');
      expect(g.value).toEqual({'one': 'newValue'});
    });

    it('should not set the parent when explicitly specified', () => {
      c.patchValue('newValue', {onlySelf: true});
      expect(g.value).toEqual({'one': 'oldValue'});
    });

    it('should fire an event', fakeAsync(() => {
         c.valueChanges.subscribe((value) => {
           expect(value).toEqual('newValue');
         });

         c.patchValue('newValue');
         tick();
       }));

    it('should not fire an event when explicitly specified', fakeAsync(() => {
         c.valueChanges.subscribe((value) => {
           throw 'Should not happen';
         });

         c.patchValue('newValue', {emitEvent: false});

         tick();
       }));

    it('should patch value on a disabled control', () => {
      g.addControl('two', new FormControl('two'));
      c.disable();

      c.patchValue('new value');
      expect(c.value).toEqual('new value');
      expect(g.value).toEqual({'two': 'two'});
    });
  });

  describe('reset()', () => {
    let c: FormControl;

    beforeEach(() => {
      c = new FormControl('initial value');
    });

    it('should reset to a specific value if passed', () => {
      c.setValue('new value');
      expect(c.value).toBe('new value');

      c.reset('initial value');
      expect(c.value).toBe('initial value');
    });

    it('should not set the parent when explicitly specified', () => {
      const g = new FormGroup({'one': c});
      c.patchValue('newValue', {onlySelf: true});
      expect(g.value).toEqual({'one': 'initial value'});
    });

    it('should reset to a specific value if passed with boxed value', () => {
      c.setValue('new value');
      expect(c.value).toBe('new value');

      c.reset({value: 'initial value', disabled: false});
      expect(c.value).toBe('initial value');
    });

    it('should clear the control value if no value is passed', () => {
      c.setValue('new value');
      expect(c.value).toBe('new value');

      c.reset();
      expect(c.value).toBe(null);
    });

    it('should reset to the initial value if specified in FormControlOptions', () => {
      const c2 = new FormControl('foo', {nonNullable: true});
      expect(c2.value).toBe('foo');
      expect(c2.defaultValue).toBe('foo');

      c2.setValue('bar');
      expect(c2.value).toBe('bar');
      expect(c2.defaultValue).toBe('foo');

      c2.reset();
      expect(c2.value).toBe('foo');
      expect(c2.defaultValue).toBe('foo');

      const c3 = new FormControl('foo', {nonNullable: false});
      expect(c3.value).toBe('foo');
      expect(c3.defaultValue).toBe(null);

      c3.setValue('bar');
      expect(c3.value).toBe('bar');
      expect(c3.defaultValue).toBe(null);

      c3.reset();
      expect(c3.value).toBe(null);
      expect(c3.defaultValue).toBe(null);
    });

    it('should look inside FormState objects for a default value', () => {
      const c2 = new FormControl({value: 'foo', disabled: false}, {initialValueIsDefault: true});
      expect(c2.value).toBe('foo');
      expect(c2.defaultValue).toBe('foo');

      c2.setValue('bar');
      expect(c2.value).toBe('bar');
      expect(c2.defaultValue).toBe('foo');

      c2.reset();
      expect(c2.value).toBe('foo');
      expect(c2.defaultValue).toBe('foo');
    });

    it('should not alter the disabled state when resetting, even if a default value is provided',
       () => {
         const c2 = new FormControl({value: 'foo', disabled: true}, {nonNullable: true});
         expect(c2.value).toBe('foo');
         expect(c2.defaultValue).toBe('foo');
         expect(c2.disabled).toBe(true);

         c2.setValue('bar');
         c2.enable();

         c2.reset();
         expect(c2.value).toBe('foo');
         expect(c2.defaultValue).toBe('foo');
         expect(c2.disabled).toBe(false);
       });

    it('should update the value of any parent controls with passed value', () => {
      const g = new FormGroup({'one': c});
      c.setValue('new value');
      expect(g.value).toEqual({'one': 'new value'});

      c.reset('initial value');
      expect(g.value).toEqual({'one': 'initial value'});
    });

    it('should update the value of any parent controls with null value', () => {
      const g = new FormGroup({'one': c});
      c.setValue('new value');
      expect(g.value).toEqual({'one': 'new value'});

      c.reset();
      expect(g.value).toEqual({'one': null});
    });

    it('should mark the control as pristine', () => {
      c.markAsDirty();
      expect(c.pristine).toBe(false);

      c.reset();
      expect(c.pristine).toBe(true);
    });

    it('should set the parent pristine state if all pristine', () => {
      const g = new FormGroup({'one': c});
      c.markAsDirty();
      expect(g.pristine).toBe(false);

      c.reset();
      expect(g.pristine).toBe(true);
    });

    it('should not set the parent pristine state if it has other dirty controls', () => {
      const c2 = new FormControl('two');
      const g = new FormGroup({'one': c, 'two': c2});
      c.markAsDirty();
      c2.markAsDirty();

      c.reset();
      expect(g.pristine).toBe(false);
    });

    it('should mark the control as untouched', () => {
      c.markAsTouched();
      expect(c.untouched).toBe(false);

      c.reset();
      expect(c.untouched).toBe(true);
    });

    it('should set the parent untouched state if all untouched', () => {
      const g = new FormGroup({'one': c});
      c.markAsTouched();
      expect(g.untouched).toBe(false);

      c.reset();
      expect(g.untouched).toBe(true);
    });

    it('should not set the parent untouched state if other touched controls', () => {
      const c2 = new FormControl('two');
      const g = new FormGroup({'one': c, 'two': c2});
      c.markAsTouched();
      c2.markAsTouched();

      c.reset();
      expect(g.untouched).toBe(false);
    });

    it('should retain the disabled state of the control', () => {
      c.disable();
      c.reset();

      expect(c.disabled).toBe(true);
    });

    it('should set disabled state based on boxed value if passed', () => {
      c.disable();
      c.reset({value: null, disabled: false});

      expect(c.disabled).toBe(false);
    });

    describe('reset() events', () => {
      let g: FormGroup, c2: FormControl, logger: any[];

      beforeEach(() => {
        c2 = new FormControl('two');
        g = new FormGroup({'one': c, 'two': c2});
        logger = [];
      });

      it('should emit one valueChange event per reset control', () => {
        g.valueChanges.subscribe(() => logger.push('group'));
        c.valueChanges.subscribe(() => logger.push('control1'));
        c2.valueChanges.subscribe(() => logger.push('control2'));

        c.reset();
        expect(logger).toEqual(['control1', 'group']);
      });

      it('should not fire an event when explicitly specified', fakeAsync(() => {
           g.valueChanges.subscribe((value) => {
             throw 'Should not happen';
           });
           c.valueChanges.subscribe((value) => {
             throw 'Should not happen';
           });
           c2.valueChanges.subscribe((value) => {
             throw 'Should not happen';
           });

           c.reset(null, {emitEvent: false});

           tick();
         }));

      it('should emit one statusChange event per reset control', () => {
        g.statusChanges.subscribe(() => logger.push('group'));
        c.statusChanges.subscribe(() => logger.push('control1'));
        c2.statusChanges.subscribe(() => logger.push('control2'));

        c.reset();
        expect(logger).toEqual(['control1', 'group']);
      });

      it('should emit one statusChange event per disabled control', () => {
        g.statusChanges.subscribe(() => logger.push('group'));
        c.statusChanges.subscribe(() => logger.push('control1'));
        c2.statusChanges.subscribe(() => logger.push('control2'));

        c.reset({value: null, disabled: true});
        expect(logger).toEqual(['control1', 'group']);
      });
    });
  });

  describe('valueChanges & statusChanges', () => {
    let c: FormControl;

    beforeEach(() => {
      c = new FormControl('old', Validators.required);
    });

    it('should fire an event after the value has been updated', done => {
      c.valueChanges.subscribe({
        next: (value: any) => {
          expect(c.value).toEqual('new');
          expect(value).toEqual('new');
          done();
        }
      });
      c.setValue('new');
    });

    it('should fire an event after the status has been updated to invalid', fakeAsync(() => {
         c.statusChanges.subscribe({
           next: (status: any) => {
             expect(c.status).toEqual('INVALID');
             expect(status).toEqual('INVALID');
           }
         });

         c.setValue('');
         tick();
       }));

    it('should fire statusChanges events for async validators added via options object',
       fakeAsync(() => {
         // The behavior can be tested for each of the model types.
         let statuses: string[] = [];

         // Create a form control with an async validator added via options object.
         const asc = new FormControl('', {asyncValidators: [() => Promise.resolve(null)]});

         // Subscribe to status changes.
         asc.statusChanges.subscribe((status: any) => statuses.push(status));

         // After a tick, the async validator should change status PENDING -> VALID.
         tick();
         expect(statuses).toEqual(['VALID']);
       }));

    it('should fire an event after the status has been updated to pending', fakeAsync(() => {
         const c = new FormControl('old', Validators.required, asyncValidator('expected'));

         const log: any[] /** TODO #9100 */ = [];
         c.valueChanges.subscribe({next: (value: any) => log.push(`value: '${value}'`)});

         c.statusChanges.subscribe({next: (status: any) => log.push(`status: '${status}'`)});

         c.setValue('');
         tick();

         c.setValue('nonEmpty');
         tick();

         c.setValue('expected');
         tick();

         expect(log).toEqual([
           'value: \'\'',
           'status: \'INVALID\'',
           'value: \'nonEmpty\'',
           'status: \'PENDING\'',
           'status: \'INVALID\'',
           'value: \'expected\'',
           'status: \'PENDING\'',
           'status: \'VALID\'',
         ]);
       }));

    // TODO: remove the if statement after making observable delivery sync
    it('should update set errors and status before emitting an event', done => {
      c.valueChanges.subscribe((value: any /** TODO #9100 */) => {
        expect(c.valid).toEqual(false);
        expect(c.errors).toEqual({'required': true});
        done();
      });
      c.setValue('');
    });

    it('should return a cold observable', done => {
      c.setValue('will be ignored');
      c.valueChanges.subscribe({
        next: (value: any) => {
          expect(value).toEqual('new');
          done();
        }
      });
      c.setValue('new');
    });
  });

  describe('setErrors', () => {
    it('should set errors on a control', () => {
      const c = new FormControl('someValue');

      c.setErrors({'someError': true});

      expect(c.valid).toEqual(false);
      expect(c.errors).toEqual({'someError': true});
    });

    it('should reset the errors and validity when the value changes', () => {
      const c = new FormControl('someValue', Validators.required);

      c.setErrors({'someError': true});
      c.setValue('');

      expect(c.errors).toEqual({'required': true});
    });

    it('should update the parent group\'s validity', () => {
      const c = new FormControl('someValue');
      const g = new FormGroup({'one': c});

      expect(g.valid).toEqual(true);

      c.setErrors({'someError': true});

      expect(g.valid).toEqual(false);
    });

    it('should not reset parent\'s errors', () => {
      const c = new FormControl('someValue');
      const g = new FormGroup({'one': c});

      g.setErrors({'someGroupError': true});
      c.setErrors({'someError': true});

      expect(g.errors).toEqual({'someGroupError': true});
    });

    it('should reset errors when updating a value', () => {
      const c = new FormControl('oldValue');
      const g = new FormGroup({'one': c});

      g.setErrors({'someGroupError': true});
      c.setErrors({'someError': true});

      c.setValue('newValue');

      expect(c.errors).toEqual(null);
      expect(g.errors).toEqual(null);
    });
  });

  describe('disable() & enable()', () => {
    it('should mark the control as disabled', () => {
      const c = new FormControl(null);
      expect(c.disabled).toBe(false);
      expect(c.valid).toBe(true);

      c.disable();
      expect(c.disabled).toBe(true);
      expect(c.valid).toBe(false);

      c.enable();
      expect(c.disabled).toBe(false);
      expect(c.valid).toBe(true);
    });

    it('should set the control status as disabled', () => {
      const c = new FormControl(null);
      expect(c.status).toEqual('VALID');

      c.disable();
      expect(c.status).toEqual('DISABLED');

      c.enable();
      expect(c.status).toEqual('VALID');
    });

    it('should retain the original value when disabled', () => {
      const c = new FormControl('some value');
      expect(c.value).toEqual('some value');

      c.disable();
      expect(c.value).toEqual('some value');

      c.enable();
      expect(c.value).toEqual('some value');
    });

    it('should keep the disabled control in the group, but return false for contains()', () => {
      const c = new FormControl('');
      const g = new FormGroup({'one': c});

      expect(g.get('one')).toBeDefined();
      expect(g.contains('one')).toBe(true);

      c.disable();
      expect(g.get('one')).toBeDefined();
      expect(g.contains('one')).toBe(false);
    });

    it('should mark the parent group disabled if all controls are disabled', () => {
      const c = new FormControl();
      const c2 = new FormControl();
      const g = new FormGroup({'one': c, 'two': c2});
      expect(g.enabled).toBe(true);

      c.disable();
      expect(g.enabled).toBe(true);

      c2.disable();
      expect(g.enabled).toBe(false);

      c.enable();
      expect(g.enabled).toBe(true);
    });

    it('should update the parent group value when child control status changes', () => {
      const c = new FormControl('one');
      const c2 = new FormControl('two');
      const g = new FormGroup({'one': c, 'two': c2});
      expect(g.value).toEqual({'one': 'one', 'two': 'two'});

      c.disable();
      expect(g.value).toEqual({'two': 'two'});

      c2.disable();
      expect(g.value).toEqual({'one': 'one', 'two': 'two'});

      c.enable();
      expect(g.value).toEqual({'one': 'one'});
    });

    it('should mark the parent array disabled if all controls are disabled', () => {
      const c = new FormControl();
      const c2 = new FormControl();
      const a = new FormArray([c, c2]);
      expect(a.enabled).toBe(true);

      c.disable();
      expect(a.enabled).toBe(true);

      c2.disable();
      expect(a.enabled).toBe(false);

      c.enable();
      expect(a.enabled).toBe(true);
    });

    it('should update the parent array value when child control status changes', () => {
      const c = new FormControl('one');
      const c2 = new FormControl('two');
      const a = new FormArray([c, c2]);
      expect(a.value).toEqual(['one', 'two']);

      c.disable();
      expect(a.value).toEqual(['two']);

      c2.disable();
      expect(a.value).toEqual(['one', 'two']);

      c.enable();
      expect(a.value).toEqual(['one']);
    });

    it('should ignore disabled array controls when determining dirtiness', () => {
      const c = new FormControl('one');
      const c2 = new FormControl('two');
      const a = new FormArray([c, c2]);
      c.markAsDirty();
      expect(a.dirty).toBe(true);

      c.disable();
      expect(c.dirty).toBe(true);
      expect(a.dirty).toBe(false);

      c.enable();
      expect(a.dirty).toBe(true);
    });

    it('should not make a dirty array not dirty when disabling controls', () => {
      const c = new FormControl('one');
      const c2 = new FormControl('two');
      const a = new FormArray([c, c2]);

      a.markAsDirty();
      expect(a.dirty).toBe(true);
      expect(c.dirty).toBe(false);

      c.disable();
      expect(a.dirty).toBe(true);

      c.enable();
      expect(a.dirty).toBe(true);
    });

    it('should ignore disabled controls in validation', () => {
      const c = new FormControl(null, Validators.required);
      const c2 = new FormControl(null);
      const g = new FormGroup({one: c, two: c2});
      expect(g.valid).toBe(false);

      c.disable();
      expect(g.valid).toBe(true);

      c.enable();
      expect(g.valid).toBe(false);
    });

    it('should ignore disabled controls when serializing value in a group', () => {
      const c = new FormControl('one');
      const c2 = new FormControl('two');
      const g = new FormGroup({one: c, two: c2});
      expect(g.value).toEqual({one: 'one', two: 'two'});

      c.disable();
      expect(g.value).toEqual({two: 'two'});

      c.enable();
      expect(g.value).toEqual({one: 'one', two: 'two'});
    });

    it('should ignore disabled controls when serializing value in an array', () => {
      const c = new FormControl('one');
      const c2 = new FormControl('two');
      const a = new FormArray([c, c2]);
      expect(a.value).toEqual(['one', 'two']);

      c.disable();
      expect(a.value).toEqual(['two']);

      c.enable();
      expect(a.value).toEqual(['one', 'two']);
    });

    it('should ignore disabled controls when determining dirtiness', () => {
      const c = new FormControl('one');
      const c2 = new FormControl('two');
      const g = new FormGroup({one: c, two: c2});
      c.markAsDirty();
      expect(g.dirty).toBe(true);

      c.disable();
      expect(c.dirty).toBe(true);
      expect(g.dirty).toBe(false);

      c.enable();
      expect(g.dirty).toBe(true);
    });

    it('should not make a dirty group not dirty when disabling controls', () => {
      const c = new FormControl('one');
      const c2 = new FormControl('two');
      const g = new FormGroup({one: c, two: c2});

      g.markAsDirty();
      expect(g.dirty).toBe(true);
      expect(c.dirty).toBe(false);

      c.disable();
      expect(g.dirty).toBe(true);

      c.enable();
      expect(g.dirty).toBe(true);
    });

    it('should ignore disabled controls when determining touched state', () => {
      const c = new FormControl('one');
      const c2 = new FormControl('two');
      const g = new FormGroup({one: c, two: c2});
      c.markAsTouched();
      expect(g.touched).toBe(true);

      c.disable();
      expect(c.touched).toBe(true);
      expect(g.touched).toBe(false);

      c.enable();
      expect(g.touched).toBe(true);
    });

    it('should not run validators on disabled controls', () => {
      const validator = jasmine.createSpy('validator');
      const c = new FormControl('', validator);
      expect(validator.calls.count()).toEqual(1);

      c.disable();
      expect(validator.calls.count()).toEqual(1);

      c.setValue('value');
      expect(validator.calls.count()).toEqual(1);

      c.enable();
      expect(validator.calls.count()).toEqual(2);
    });

    describe('disabled errors', () => {
      it('should clear out the errors when disabled', () => {
        const c = new FormControl('', Validators.required);
        expect(c.errors).toEqual({required: true});

        c.disable();
        expect(c.errors).toEqual(null);

        c.enable();
        expect(c.errors).toEqual({required: true});
      });

      it('should clear out async errors when disabled', fakeAsync(() => {
           const c = new FormControl('', null!, asyncValidator('expected'));
           tick();
           expect(c.errors).toEqual({'async': true});

           c.disable();
           expect(c.errors).toEqual(null);

           c.enable();
           tick();
           expect(c.errors).toEqual({'async': true});
         }));
    });

    describe('disabled events', () => {
      let logger: string[];
      let c: FormControl;
      let g: FormGroup;

      beforeEach(() => {
        logger = [];
        c = new FormControl('', Validators.required);
        g = new FormGroup({one: c});
      });

      it('should emit a statusChange event when disabled status changes', () => {
        c.statusChanges.subscribe((status: string) => logger.push(status));

        c.disable();
        expect(logger).toEqual(['DISABLED']);

        c.enable();
        expect(logger).toEqual(['DISABLED', 'INVALID']);
      });

      it('should emit status change events in correct order', () => {
        c.statusChanges.subscribe(() => logger.push('control'));
        g.statusChanges.subscribe(() => logger.push('group'));

        c.disable();
        expect(logger).toEqual(['control', 'group']);
      });

      it('should throw when sync validator passed into async validator param', () => {
        const fn = () => new FormControl('', syncValidator, syncValidator);
        // test for the specific error since without the error check it would still throw an error
        // but
        // not a meaningful one
        expect(fn).toThrowError(
            'NG01101: Expected async validator to return Promise or Observable. ' +
            'Are you using a synchronous validator where an async validator is expected? ' +
            'Find more at https://angular.io/errors/NG01101');
      });

      it('should not emit value change events when emitEvent = false', () => {
        c.valueChanges.subscribe(() => logger.push('control'));
        g.valueChanges.subscribe(() => logger.push('group'));

        c.disable({emitEvent: false});
        expect(logger).toEqual([]);
        c.enable({emitEvent: false});
        expect(logger).toEqual([]);
      });

      it('should not emit status change events when emitEvent = false', () => {
        c.statusChanges.subscribe(() => logger.push('control'));
        g.statusChanges.subscribe(() => logger.push('form'));

        c.disable({emitEvent: false});
        expect(logger).toEqual([]);
        c.enable({emitEvent: false});
        expect(logger).toEqual([]);
      });
    });
  });
  describe('pending', () => {
    let c: FormControl;

    beforeEach(() => {
      c = new FormControl('value');
    });

    it('should be false after creating a control', () => {
      expect(c.pending).toEqual(false);
    });

    it('should be true after changing the value of the control', () => {
      c.markAsPending();
      expect(c.pending).toEqual(true);
    });

    describe('status change events', () => {
      let logger: string[];

      beforeEach(() => {
        logger = [];
        c.statusChanges.subscribe((status) => logger.push(status));
      });

      it('should emit event after marking control as pending', () => {
        c.markAsPending();
        expect(logger).toEqual(['PENDING']);
      });

      it('should not emit event when emitEvent = false', () => {
        c.markAsPending({emitEvent: false});
        expect(logger).toEqual([]);
      });
    });
  });

  describe('can be extended', () => {
    // We don't technically support extending Forms classes, but people do it anyway.
    // We need to make sure that there is some way to extend them to avoid causing breakage.

    class FCExt extends FormControl {
      constructor(formState?: any|{
        value?: any;
        disabled?: boolean;
      }, ...args: any) {
        super(formState, ...args);
      }
    }

    it('should perform basic FormControl operations', () => {
      const nc = new FCExt({value: 'foo'});
      nc.setValue('bar');
      // There is no need to assert because, if this test compiles, then it is possible to correctly
      // extend FormControl.
    });
  });

  describe('inspecting the prototype still provides FormControl type', () => {
    // The constructor should be a function with a prototype property of T.
    // (This is the assumption we don't want to break.)
    type Constructor<T> = Function&{prototype: T};

    function isInstanceOf<T>(value: Constructor<T>, arg: unknown): arg is T {
      // The implementation does not matter; we want to check whether this guard narrows the type.
      return true;
    }

    // This is a nullable FormControl, and we want isInstanceOf to narrow the type.
    const fcOrNull: FormControl|null = new FormControl(42);

    it('and is appropriately narrowed', () => {
      if (isInstanceOf(FormControl, fcOrNull)) {
        // If the guard does not work, then this code will not compile due to null being in the
        // type.
        fcOrNull.setValue(7);
      }
    });
  });

  describe('Function.name', () => {
    it('returns FormControl', () => {
      // This is always true in the trivial case, but can be broken by various methods of overriding
      // FormControl's exported constructor.
      expect(FormControl.name).toBe('FormControl');
    });
  });
});
})();