ember-test-friendly-catch-handler

In production, you often want to catch certain types of errors such as network errors (e.g. myModel.save().catch(() => this.showNetworkFailureMessage())) however these kinds of generic catch handlers can wreak havoc on your tests. In tests, most of the time you want these uncaught errors to actually fail your tests unless explicitly testing the generic catch handler behaviors (e.g. this.showNetworkFailureMessage).

Installation

ember install ember-test-friendly-catch-handler

Usage

In your application code you would import the catch generator, and invoke it with a descriptive label and your callback.

import catchGenerator from 'ember-test-friendly-catch-handler';

// ... snip ...
myModel.save()
  .catch(catchGenerator('save-my-model', () => this.showNetworkFailureMessage()));

When you need to test the generic handler behavior (this.showNetworkFailureMessage() above), you need to disable the automatic error re-throwing behavior that ember-test-friendly-catch-handler provides you so that your test more closely resembles your production environment.

A test that does this might look like:

import { module, test } from 'qunit';
import { 
  squelchCatchHandlerFor,
  unsquelchAllCatchHandlers
} from 'ember-test-friendly-catch-handler';

module('some good description', {
  afterEach() {
    unsquelchAllCatchHandlers(); 
  }
});

test('network failure message is displayed', function(assert) {
  squelchCatchHandlerFor('save-my-model');

  triggerNetworkFailure();         // ⚡️
  return triggerModelSave()
    .then(() => {
      assertNetworkFailureShown(); // 😼
    });
});

API

The following interface describes the ember-test-friendly-catch-handler module's API:

export default function(label: string, callback: Function): Function;

// the following are only present when testing
export function squelchCatchHandlerFor(label: string): void;
export function unsquelchAllCatchHandlers(): void;

Contributing

Installation

• git clone <repository-url> this repository
• cd ember-test-friendly-catch-handler
• npm install

Running

• ember serve
• Visit your app at http://localhost:4200.

Running Tests

• npm test (Runs ember try:each to test your addon against multiple Ember versions)
• ember test
• ember test --server

Building

• ember build

For more information on using ember-cli, visit https://ember-cli.com/.