Move style mock under mocks/

Signed-off-by: Tyler Ohlsen <ohltyler@amazon.com>

Author: ohltyler

test/jest.config.js

@@ -7,8 +7,10 @@ module.exports = {
   rootDir: '../',
   roots: ['<rootDir>'],
   coverageDirectory: './coverage',
+  // we mock any style-related files and return an empty module. This is needed due to errors
+  // when jest tries to interpret these types of files.
   moduleNameMapper: {
-    '\\.(css|less|scss|sass)$': '<rootDir>/test/style_stub.js',
+    '\\.(css|less|scss|sass)$': '<rootDir>/test/mocks/style_mock.ts',
   },
   testEnvironment: 'jest-environment-jsdom',
   coverageReporters: ['lcov', 'text', 'cobertura'],

test/style_stub.js test/mocks/style_mock.ts

@@ -3,4 +3,4 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-module.exports = {};
+export default {};