How to use ngIf method in ng-mocks

Best JavaScript code snippet using ng-mocks

ng_if.d.ts

Source:ng_if.d.ts Github

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1/**2 * @license3 * Copyright Google Inc. All Rights Reserved.4 *5 * Use of this source code is governed by an MIT-style license that can be6 * found in the LICENSE file at https://angular.io/license7 */8import { TemplateRef, ViewContainerRef } from '@angular/core';9/**10 * Conditionally includes a template based on the value of an `expression`.11 *12 * `ngIf` evaluates the `expression` and then renders the `then` or `else` template in its place13 * when expression is truthy or falsy respectively. Typically the:14 * - `then` template is the inline template of `ngIf` unless bound to a different value.15 * - `else` template is blank unless it is bound.16 *17 * # Most common usage18 *19 * The most common usage of the `ngIf` directive is to conditionally show the inline template as20 * seen in this example:21 * {@example common/ngIf/ts/module.ts region='NgIfSimple'}22 *23 * # Showing an alternative template using `else`24 *25 * If it is necessary to display a template when the `expression` is falsy use the `else` template26 * binding as shown. Note that the `else` binding points to a `<ng-template>` labeled `#elseBlock`.27 * The template can be defined anywhere in the component view but is typically placed right after28 * `ngIf` for readability.29 *30 * {@example common/ngIf/ts/module.ts region='NgIfElse'}31 *32 * # Using non-inlined `then` template33 *34 * Usually the `then` template is the inlined template of the `ngIf`, but it can be changed using35 * a binding (just like `else`). Because `then` and `else` are bindings, the template references can36 * change at runtime as shown in this example.37 *38 * {@example common/ngIf/ts/module.ts region='NgIfThenElse'}39 *40 * # Storing conditional result in a variable41 *42 * A common pattern is that we need to show a set of properties from the same object. If the43 * object is undefined, then we have to use the safe-traversal-operator `?.` to guard against44 * dereferencing a `null` value. This is especially the case when waiting on async data such as45 * when using the `async` pipe as shown in folowing example:46 *47 * ```48 * Hello {{ (userStream|async)?.last }}, {{ (userStream|async)?.first }}!49 * ```50 *51 * There are several inefficiencies in the above example:52 * - We create multiple subscriptions on `userStream`. One for each `async` pipe, or two in the53 * example above.54 * - We cannot display an alternative screen while waiting for the data to arrive asynchronously.55 * - We have to use the safe-traversal-operator `?.` to access properties, which is cumbersome.56 * - We have to place the `async` pipe in parenthesis.57 *58 * A better way to do this is to use `ngIf` and store the result of the condition in a local59 * variable as shown in the the example below:60 *61 * {@example common/ngIf/ts/module.ts region='NgIfAs'}62 *63 * Notice that:64 * - We use only one `async` pipe and hence only one subscription gets created.65 * - `ngIf` stores the result of the `userStream|async` in the local variable `user`.66 * - The local `user` can then be bound repeatedly in a more efficient way.67 * - No need to use the safe-traversal-operator `?.` to access properties as `ngIf` will only68 * display the data if `userStream` returns a value.69 * - We can display an alternative template while waiting for the data.70 *71 * ### Syntax72 *73 * Simple form:74 * - `<div *ngIf="condition">...</div>`75 * - `<div template="ngIf condition">...</div>`76 * - `<ng-template [ngIf]="condition"><div>...</div></ng-template>`77 *78 * Form with an else block:79 * ```80 * <div *ngIf="condition; else elseBlock">...</div>81 * <ng-template #elseBlock>...</ng-template>82 * ```83 *84 * Form with a `then` and `else` block:85 * ```86 * <div *ngIf="condition; then thenBlock else elseBlock"></div>87 * <ng-template #thenBlock>...</ng-template>88 * <ng-template #elseBlock>...</ng-template>89 * ```90 *91 * Form with storing the value locally:92 * ```93 * <div *ngIf="condition as value; else elseBlock">{{value}}</div>94 * <ng-template #elseBlock>...</ng-template>95 * ```96 *97 * @stable98 */99export declare class NgIf {100 private _viewContainer;101 private _context;102 private _thenTemplateRef;103 private _elseTemplateRef;104 private _thenViewRef;105 private _elseViewRef;106 constructor(_viewContainer: ViewContainerRef, templateRef: TemplateRef<NgIfContext>);107 ngIf: any;108 ngIfThen: TemplateRef<NgIfContext>;109 ngIfElse: TemplateRef<NgIfContext>;110 private _updateView();111}112/**113 * @stable114 */115export declare class NgIfContext {116 $implicit: any;117 ngIf: any;...

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1import { ngIf } from 'ng-mocks';2describe('TestComponent', () => {3 let component: TestComponent;4 let fixture: ComponentFixture<TestComponent>;5 beforeEach(async(() => {6 TestBed.configureTestingModule({7 })8 .compileComponents();9 }));10 beforeEach(() => {11 fixture = TestBed.createComponent(TestComponent);12 component = fixture.componentInstance;13 fixture.detectChanges();14 });15 it('should create', () => {16 expect(component).toBeTruthy();17 });18});

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1import { MockBuilder, MockRender, ngMocks } from 'ng-mocks';2import { Component } from '@angular/core';3import { MyComponent } from './my.component';4describe('MyComponent', () => {5 beforeEach(() => MockBuilder(MyComponent));6 it('renders', () => {7 const fixture = MockRender(MyComponent);8 const element = ngMocks.find('h1');9 expect(element).toBeDefined();10 expect(element.innerHTML).toEqual('MyComponent');11 });12 it('renders with ngIf', () => {13 const fixture = MockRender(MyComponent);14 const element = ngMocks.find('h1');15 expect(element).toBeDefined();16 expect(element.innerHTML).toEqual('MyComponent');17 ngMocks.input(fixture.debugElement.componentInstance, 'show', false);18 fixture.detectChanges();19 expect(ngMocks.find('h1')).toBeUndefined();20 });21});22import { Component, Input } from '@angular/core';23@Component({24})25export class MyComponent {26 @Input() show = true;27}28import { MockBuilder, MockRender, ngMocks } from 'ng-mocks';29import { Component } from '@angular/core';30import { MyComponent } from './my.component';31describe('MyComponent', () => {32 beforeEach(() => MockBuilder(MyComponent));33 it('renders', () => {34 const fixture = MockRender(MyComponent);35 const element = ngMocks.find('h1');36 expect(element).toBeDefined();37 expect(element.innerHTML).toEqual('MyComponent');38 });39 it('renders with ngIf', () => {40 const fixture = MockRender(MyComponent);41 const element = ngMocks.find('h1');42 expect(element).toBeDefined();43 expect(element.innerHTML).toEqual('MyComponent');44 ngMocks.input(fixture.debugElement.componentInstance, 'show', false);45 fixture.detectChanges();46 expect(ngMocks.find('h1')).toBeUndefined();47 });48});49import { Component, Input } from '@angular/core';

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1import { NgIf } from '@angular/common';2import { Component, Input } from '@angular/core';3import { MockBuilder, MockRender, ngMocks } from 'ng-mocks';4@Component({5})6class TargetComponent {7 @Input()8 public condition: boolean = false;9}10describe('ngIf', () => {11 beforeEach(() => MockBuilder(TargetComponent));12 it('shows ngIf', () => {13 const fixture = MockRender(`<target>content</target>`);14 expect(ngMocks.formatText(fixture)).toEqual('content');15 fixture.point.componentInstance.condition = true;16 fixture.detectChanges();17 expect(ngMocks.formatText(fixture)).toEqual('content');18 });19 it('hides ngIf', () => {20 const fixture = MockRender(`<target>content</target>`);21 expect(ngMocks.formatText(fixture)).toEqual('content');22 fixture.point.componentInstance.condition = false;23 fixture.detectChanges();24 expect(ngMocks.formatText(fixture)).toEqual('');25 });26});

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1import { ngMocks } from 'ng-mocks';2import { MyComponent } from './my.component';3describe('MyComponent', () => {4 let fixture: ComponentFixture<MyComponent>;5 beforeEach(() => {6 TestBed.configureTestingModule({7 });8 fixture = TestBed.createComponent(MyComponent);9 fixture.detectChanges();10 });11 it('should render content', () => {12 expect(fixture.nativeElement.querySelector('div')).toBeFalsy();13 ngMocks.toggle(fixture.componentInstance, 'show');14 fixture.detectChanges();15 expect(fixture.nativeElement.querySelector('div')).toBeTruthy();16 });17});

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1import {ngMocks} from 'ng-mocks';2import {ComponentFixture, TestBed} from '@angular/core/testing';3import {Component} from '@angular/core';4@Component({5})6export class MyComponent {}7describe('ng-mocks', () => {8 let fixture: ComponentFixture<MyComponent>;9 beforeEach(() => {10 TestBed.configureTestingModule({11 });12 fixture = TestBed.createComponent(MyComponent);13 });14 it('should work', () => {15 fixture.detectChanges();16 expect(ngMocks.formatText(fixture)).toEqual('Hello!');17 });18});19import 'zone.js/dist/zone-testing';20import {getTestBed} from '@angular/core/testing';21import {22} from '@angular/platform-browser-dynamic/testing';23getTestBed().initTestEnvironment(24 platformBrowserDynamicTesting()25);26module.exports = function(config) {27 config.set({28 require('karma-jasmine'),29 require('karma-chrome-launcher'),30 require('karma-jasmine-html-reporter'),31 require('karma-coverage-istanbul-reporter'),32 require('@angular-devkit/build-angular/plugins/karma')33 client: {34 },35 coverageIstanbulReporter: {36 dir: require('path').join(__dirname, './coverage/ng-mocks'),37 },38 angularCli: {39 },40 });41};

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1import { MockBuilder, MockRender, ngMocks } from 'ng-mocks';2import { MyComponent } from './my.component';3describe('MyComponent', () => {4 beforeEach(() => MockBuilder(MyComponent));5 it('renders the component', () => {6 const fixture = MockRender(MyComponent);7 expect(ngMocks.find(MyComponent)).toBeDefined();8 });9});10import { Component } from '@angular/core';11@Component({12})13export class MyComponent {}14import { MockBuilder, MockRender, ngMocks } from 'ng-mocks';15import { MyComponent } from './my.component';16describe('MyComponent', () => {17 beforeEach(() => MockBuilder(MyComponent));18 it('renders the component', () => {19 const fixture = MockRender(MyComponent);20 expect(ngMocks.find(MyComponent)).toBeDefined();21 });22});23import { MockBuilder, MockRender, ngMocks } from 'ng-mocks';24import { MyComponent } from './my.component';25describe('MyComponent', () => {26 beforeEach(() => MockBuilder(MyComponent));27 it('renders the component', () => {28 const fixture = MockRender(MyComponent);29 expect(ngMocks.find(MyComponent)).toBeDefined();30 });31});32div {33 color: blue;34}35import { MockBuilder, MockRender, ngMocks } from 'ng-mocks';36import { MyComponent } from './my.component';37describe('MyComponent', () => {38 beforeEach(() => MockBuilder(MyComponent));39 it('renders the component', () => {40 const fixture = MockRender(MyComponent);41 expect(ngMocks.find(MyComponent)).toBeDefined();42 });43});44div {45 color: blue;46}47import { MockBuilder, MockRender, ngMocks } from 'ng-mocks';48import { MyComponent } from './my.component';49describe('MyComponent', () => {50 beforeEach(() => MockBuilder(MyComponent));51 it('renders the component', () => {52 const fixture = MockRender(MyComponent

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1import { ngMocks } from 'ng-mocks';2import { MyComponent } from './my.component';3import { MyService } from './my.service';4describe('MyComponent', () => {5 ngMocks.faster();6 it('should work', () => {7 const fixture = ngMocks.faster();8 const component = ngMocks.findInstance(MyComponent);9 const service = ngMocks.findInstance(MyService);10 fixture.detectChanges();11 expect(service).toBeDefined();12 expect(component).toBeDefined();13 });14});15import { Injectable } from '@angular/core';16@Injectable()17export class MyService {18 constructor() {19 console.log('MyService instantiated');20 }21}22import { Component } from '@angular/core';23@Component({24})25export class MyComponent {26 constructor() {27 console.log('MyComponent instantiated');28 }29}30import { NgModule } from '@angular/core';31import { MyComponent } from './my.component';32import { MyService } from './my.service';33@NgModule({34})35export class MyModule {}36import { ngMocks } from 'ng-mocks';37import { MyComponent } from './my.component';38import { MyService } from './my.service';39import { MyModule } from './my.module';40describe('MyComponent', () => {41 ngMocks.faster();42 it('should work', () => {43 const fixture = ngMocks.faster();44 const component = ngMocks.findInstance(MyComponent);45 const service = ngMocks.findInstance(MyService);46 fixture.detectChanges();47 expect(service).toBeDefined();48 expect(component).toBeDefined();49 });50});51import { Component } from '@angular/core';52@Component({53})54export class MyComponent {55 constructor() {56 console.log('MyComponent instantiated');57 }58}59import { Injectable } from '@angular/core';60@Injectable()61export class MyService {62 constructor() {63 console.log('MyService instantiated');64 }65}66import { NgModule

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1it('should display the title', () => {2 const fixture = TestBed.createComponent(AppComponent);3 fixture.detectChanges();4 const compiled = fixture.debugElement.nativeElement;5 expect(compiled.querySelector('h1').textContent).toContain('Welcome to app!');6});7it('should display the title', () => {8 const fixture = TestBed.createComponent(AppComponent);9 fixture.detectChanges();10 const compiled = fixture.debugElement.nativeElement;11 expect(compiled.querySelector('h1').textContent).toContain('Welcome to app!');12});

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1import { MockRender } from 'ng-mocks';2import { AppComponent } from './app.component';3import { AppModule } from './app.module';4import { MatButton } from '@angular/material/button';5describe('AppComponent', () => {6 beforeEach(() => {7 MockRender(AppComponent, AppModule);8 });9 it('should create the app', () => {10 const fixture = MockRender(AppComponent, AppModule);11 const app = fixture.debugElement.componentInstance;12 expect(app).toBeTruthy();13 });14 it('should render title in a h1 tag', () => {15 const fixture = MockRender(AppComponent, AppModule);16 expect(fixture.debugElement.nativeElement.querySelector('h1').textContent).toContain('Welcome to ng-mocks!');17 });18 it('should render button', () => {19 const fixture = MockRender(AppComponent, AppModule);20 const button = fixture.debugElement.query(By.directive(MatButton)).nativeElement;21 expect(button).toBeTruthy();22 });23});24<h1>Welcome to {{ title }}!</h1>25import { NgModule } from '@angular/core';26import { BrowserModule } from '@angular/platform-browser';27import { BrowserAnimationsModule } from '@angular/platform-browser/animations';28import { MatButtonModule } from '@angular/material/button';29import { MatToolbarModule } from '@angular/material/toolbar';30import { AppComponent } from './app.component';31@NgModule({32 imports: [BrowserModule, BrowserAnimationsModule, MatButtonModule, MatToolbarModule],33})34export class AppModule {}35 ✓ should create the app (7ms)36 ✓ should render title in a h1 tag (2ms)37 ✓ should render button (2ms)38 at Object.<anonymous> (test.js:13:13)39 at step (test.js:32:23)40 at Object.next (test.js:13:53)41 at fulfilled (test.js:4:58)

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