Ember integration breaks the ember test environment

[oskarrough]

Package + Version

• @sentry/browser: 4.1.1
• ember-cli: 3.4.5

Description

When the Sentry.Ember integration is added to a fresh project the tests will fail with:

ember-qunit: Ember.onerror validation: Ember.onerror is functioning properly
    ✘ Ember.onerror handler with invalid testing behavior detected. An Ember.onerror handler _must_ r
ethrow exceptions when `Ember.testing` is `true` or the test suite is unreliable. See https://git.io/
vbine for more details.

I followed https://docs.sentry.io/platforms/javascript/ember/ and did

// app/app.js
import * as Sentry from '@sentry/browser'

if (!ENV.environment === 'test') {
	Sentry.init({
		dsn: 'abc123',
		integrations: [new Sentry.Integrations.Ember()]
	})
}

To fix it, I added a conditional to not load sentry while testing.

import ENV from 'my-app/config/environment'
if (!ENV.environment === 'test') {
	Sentry.init({
		dsn: 'abc123',
		integrations: [new Sentry.Integrations.Ember()]
	})
}`

Should this be handled in the integration or just update the docs?

[Turbo87]

see #1696 :)