Load EE fixtures from ee/ directory in Jest

(cherry picked from commit 2917a28a885922a03f2026ddbb2680bc2b6e5d50)

spec/frontend/environment.js

@@ -24,8 +24,9 @@ class CustomEnvironment extends JSDOMEnvironment {
     });
 
     const { testEnvironmentOptions } = config;
+    const { IS_EE } = testEnvironmentOptions;
     this.global.gon = {
-      ee: testEnvironmentOptions.IS_EE,
+      ee: IS_EE,
     };
 
     this.rejectedPromises = [];
@@ -33,6 +34,10 @@ class CustomEnvironment extends JSDOMEnvironment {
     this.global.promiseRejectionHandler = error => {
       this.rejectedPromises.push(error);
     };
+
+    this.global.fixturesBasePath = `${process.cwd()}/${
+      IS_EE ? 'ee/' : ''
+    }spec/javascripts/fixtures`;
   }
 
   async teardown() {

spec/frontend/helpers/fixtures.js

@@ -3,10 +3,8 @@ import path from 'path';
 
 import { ErrorWithStack } from 'jest-util';
 
-const fixturesBasePath = path.join(process.cwd(), 'spec', 'javascripts', 'fixtures');
-
 export function getFixture(relativePath) {
-  const absolutePath = path.join(fixturesBasePath, relativePath);
+  const absolutePath = path.join(global.fixturesBasePath, relativePath);
   if (!fs.existsSync(absolutePath)) {
     throw new ErrorWithStack(
       `Fixture file ${relativePath} does not exist.