Feature/browserstack (#902)

Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de>

cypress/support/fill.ts

@@ -0,0 +1,23 @@
+/*
+ * SPDX-FileCopyrightText: 2020 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+// eslint-disable-next-line @typescript-eslint/no-namespace
+declare namespace Cypress {
+  interface Chainable {
+    /**
+     * Custom command to fill an input field with text and trigger a change event.
+     * @example cy.get(input).fill('content')
+     */
+    fill (value: string): Chainable<Element>
+  }
+}
+
+Cypress.Commands.add('fill', {
+  prevSubject: 'element'
+}, (subject, value) => {
+  cy.wrap(subject).invoke('val', value)
+  .trigger('change', { force: true })
+})