Use FIXTURES_PATH in balsamiq_viewer_integration_spec.js

config/karma.config.js

@@ -110,7 +110,7 @@ module.exports = function(config) {
     frameworks: ['jasmine'],
     files: [
       { pattern: 'spec/javascripts/test_bundle.js', watched: false },
-      { pattern: 'spec/javascripts/fixtures/**/*@(.json|.html|.png)', included: false },
+      { pattern: `spec/javascripts/fixtures/**/*@(.json|.html|.png|.bmpr)`, included: false },
     ],
     preprocessors: {
       'spec/javascripts/**/*.js': ['webpack', 'sourcemap'],

spec/javascripts/blob/balsamiq/balsamiq_viewer_integration_spec.js

 import BalsamiqViewer from '~/blob/balsamiq/balsamiq_viewer';
-import bmprPath from '../../fixtures/blob/balsamiq/test.bmpr';
+import { FIXTURES_PATH } from 'spec/test_constants';
+
+const bmprPath = `${FIXTURES_PATH}/blob/balsamiq/test.bmpr`;
 
 describe('Balsamiq integration spec', () => {
   let container;