Fix rails-ujs tests not being linted

Before rails-ujs was [updated][1] from coffeescript to es6, the lint
task ran eslint on both the coffee files and the ujs test files. When it
was updated to lint the new es6 files, the test files were erroneously
left out.

This commit fixes the task to lint the rails-ujs test files and fixes
the lint errors that have been introduced since.

[1]: 7d116c9

Author: skipkayhil

actionview/package.json

@@ -14,7 +14,7 @@
     "build": "rollup --config rollup.config.js",
     "pretest": "rollup --config rollup.config.test.js",
     "test": "karma start",
-    "lint": "eslint app/javascript"
+    "lint": "eslint app/javascript && eslint test/ujs/public/test"
   },
   "repository": {
     "type": "git",

actionview/test/ujs/public/test/call-ajax.js

@@ -1,5 +1,5 @@
 import $ from 'jquery'
-import Rails from "../../../../app/javascript/rails-ujs/index"
+import Rails from '../../../../app/javascript/rails-ujs/index'
 
 QUnit.module('call-ajax', {
   beforeEach: function() {

actionview/test/ujs/public/test/data-method.js

@@ -103,6 +103,6 @@ QUnit.test('do not interact with contenteditable elements', function(assert) {
 
   var collection = document.getElementsByTagName('form')
   for (const item of collection) {
-    assert.notEqual(item.action, "http://www.shouldnevershowindocument.com/")
+    assert.notEqual(item.action, 'http://www.shouldnevershowindocument.com/')
   }
 })

actionview/test/ujs/public/test/settings.js

@@ -1,4 +1,4 @@
-import $ from 'jquery';
+import $ from 'jquery'
 import Rails from '../../../../app/javascript/rails-ujs/index'
 
 $.rails = Rails