Fix broken build (#72)

* Fix linting issue

* Use config provided by cypress docs

* Can't use npm ci because package-lock isn't commited

Author: afontcu

.travis.yml

@@ -3,10 +3,14 @@ language: node_js
 addons:
   apt:
     packages:
-    - libgconf-2-4
+      - libgconf-2-4
 cache:
+  # Caches $HOME/.npm when npm ci is default script command
+  # Caches node_modules in all other cases
+  npm: true
   directories:
-    - ~/.npm
+    # we also need to cache folder with Cypress binary
+    - ~/.cache
 notifications:
   email: false
 node_js: '8'

cypress/integration/commands.spec.js

@@ -40,7 +40,7 @@ describe('dom-testing-library commands', () => {
   })
 
   it('getByText in container', () => {
-    cy.get('#nested').then(subject => {
+    return cy.get('#nested').then(subject => {
       cy.getByText('Button Text', {container: subject}).click()
     })
   })