Method beforeEach

packages/ember/tests/error_handler_test.js:20–24

()

  'error_handler',
  class extends AbstractTestCase {
    beforeEach() {
      // capturing this outside of module scope to ensure we grab
      // the test frameworks own window.onerror to reset it
      WINDOW_ONERROR = window.onerror;
    }

    afterEach() {
      setTesting(isTesting);