I'm trying to run Angular 2 unit tests on an Angular 2 Component with Jasmine (I am not using Karma, however... just webpacking my code then running the tests in the default Jasmine SpecRunner.html).
When I run my code, I get the error: "A platform with a different configuration has been created. Please destroy it first." Been banging my head on this all day. Reading every post on StackOverflow I can find, but I'm still stuck. Any suggestions?
import { ComponentFixture, ComponentFixtureAutoDetect, TestBed, async, fakeAsync, tick } from '@angular/core/testing';
import { By } from '@angular/platform-browser';
import { DebugElement } from '@angular/core';
import {BrowserDynamicTestingModule, platformBrowserDynamicTesting} from "@angular/platform-browser-dynamic/testing";
import {AppLogin} from "../../../app/login/app.login";
describe("Login Component", () => {
let comp: AppLogin;
let fixture: ComponentFixture<AppLogin>;
let el: DebugElement;
function setup() {
TestBed.resetTestEnvironment();
TestBed.initTestEnvironment(BrowserDynamicTestingModule, platformBrowserDynamicTesting());
}
setup();
beforeEach(() => {
TestBed.configureTestingModule({
providers: [AppLogin]
});
fixture = TestBed.createComponent(AppLogin);
comp = fixture.componentInstance;
});
it("login form should pass validation", () => {
fixture.detectChanges();
var form = {
EmailAddress: 'test@me.com',
Password: 'test'
};
var validated = comp.formValidated(form);
expect(validated).toBe(true);
});
});
Here is the component I'm attempting to test...
import { Component } from '@angular/core';
@Component({
selector: 'app-login',
template: `
<form *ngIf="active" (ngSubmit)="onSubmit()" class="form-signin">
<h2 class="form-signin-heading">Please sign in</h2>
<label for="EmailAddress" class="sr-only">Email address</label>
<input type="email" name="EmailAddress" id="EmailAddress" class="form-control" placeholder="Email address"
[(ngModel)]="form.EmailAddress" required autofocus>
<label for="Password" class="sr-only">Password</label>
<input type="password" name="Password" id="Password" class="form-control" placeholder="Password" required
[(ngModel)]="form.Password">
<div class="checkbox">
<label>
<input type="checkbox" id="RememberMe" value="remember-me" [(ngModel)]="form.RememberMe"> Remember me
</label>
</div>
<div *ngIf="form.hasError">
<div *ngFor="let error of form.errorMessages" class="alert alert-danger fade in">{{error.message}}</div>
</div>
<button class="btn btn-lg btn-primary btn-block" type="submit">Sign in</button>
</form>
`
})
export class AppLogin {
form: any;
constructor() {
//
}
formValidated(form: any): boolean {
form.errorMessages = [];
form.hasError = false;
if (form.EmailAddress == null)
form.errorMessages.push({ message: 'Email Address is required.' });
if (form.Password == null)
form.errorMessages.push({ message: 'Password is required.' });
if (form.errorMessages.count > 0)
form.hasError = true;
return !form.hasError;
}
onSubmit(form: any): void {
console.log('Form data: ', form);
}
}
Unfortunately, Jasmine alone did not provide me with the debug information I needed, so I am no longer using Jasmine alone for my unit testing. I am using the recommended Karma/Jasmine setup. (NOTE: However, I am not using the Angular karma-test-shim, which is why I have to run TestBed.initTestEnvironment).
I ran the tests in Karma and I got an error about my component's template. My component template has an angular form. I had to import the angular FormsModule into my test environment. Here is the code which resolved the issue...
import { ComponentFixture, ComponentFixtureAutoDetect, TestBed, async, fakeAsync, tick } from '@angular/core/testing';
import { By, BrowserModule } from '@angular/platform-browser';
import { DebugElement } from '@angular/core';
import {BrowserDynamicTestingModule, platformBrowserDynamicTesting} from "@angular/platform-browser-dynamic/testing";
import { FormsModule } from '@angular/forms';
import {AppLogin} from "../../../app/login/app.login";
describe("Login Component", () => {
let comp: AppLogin;
let fixture: ComponentFixture<AppLogin>;
let el: DebugElement;
beforeEach(() => {
TestBed.resetTestEnvironment();
TestBed.initTestEnvironment(BrowserDynamicTestingModule, platformBrowserDynamicTesting());
TestBed.configureTestingModule({
imports: [ FormsModule, BrowserModule ],
declarations: [ AppLogin ]
});
fixture = TestBed.createComponent(AppLogin);
comp = fixture.componentInstance;
});
it("login form should pass validation", () => {
fixture.detectChanges();
var form = {
EmailAddress: 'test@me.com',
Password: 'test'
};
var validated = comp.formValidated(form);
expect(validated).toBe(true);
});
});
I had a bunch of trouble setting up Karma with Webpack originally, but here is a Karma config I wrote, which is working really well for me (and doesn't require the karma-test-shim)...
module.exports = function(config) {
config.set({
basePath: '',
frameworks: ['jasmine'],
files: [
'src/tests/tests.ts',
'src/tests/login/app.login.spec.ts'
],
exclude: [
],
preprocessors: {
'src/tests/tests.ts': ['webpack'],
'src/tests/login/app.login.spec.ts': ['webpack', 'sourcemap']
},
webpack: {
devtool: 'inline-source-map',
resolve: {
extensions: ['', '.ts', '.js']
},
module: {
loaders: [
{
test: /\.js$/,
loader: 'babel-loader',
query: {
presets: ['es2015']
}
},
{
test: /\.ts$/,
loaders: ['ts-loader']
}
]
}
},
webpackMiddleware: {
// webpack-dev-middleware configuration
noInfo: true
},
plugins: [
require("karma-webpack"),
require("karma-jasmine"),
require("karma-chrome-launcher"),
require("karma-sourcemap-loader"),
require("karma-spec-reporter")
],
reporters: ['spec'],
port: 9876,
colors: true,
// level of logging
// possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
logLevel: config.LOG_INFO,
// enable / disable watching file and executing tests whenever any file changes
autoWatch: true,
// start these browsers
// available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
browsers: ['Chrome'],
// Continuous Integration mode
// if true, Karma captures browsers, runs the tests and exits
singleRun: true
});
};
And finally, here's the code for the tests.ts file I included in my Karma config. This is where I require() all the code I need to run angular tests...
require('zone.js/dist/zone');
require('reflect-metadata');
require('rxjs');
require('@angular/platform-browser');
require('@angular/platform-browser-dynamic');
require('@angular/core');
require('@angular/common');
require('@angular/http');
require('@angular/router');
Error.stackTraceLimit = Infinity;
require('zone.js/dist/long-stack-trace-zone');
require('zone.js/dist/proxy'); // since zone.js 0.6.15
require('zone.js/dist/sync-test');
require('zone.js/dist/jasmine-patch'); // put here since zone.js 0.6.14
require('zone.js/dist/async-test');
require('zone.js/dist/fake-async-test');
var testing = require('@angular/core/testing');