Do not run tests in build folders.

Author: Brian Stone

src/js/createJestConfig.js

@@ -13,6 +13,7 @@ const createJestConfig = () => ({
     },
     testMatch: ['<rootDir>/**/__tests__/**/*.test.js', '<rootDir>/**/*.test.js'],
     testEnvironment: 'node',
+    testPathIgnorePatterns: ['/node_modules/', '<rootDir>/lib/', '<rootDir>/es/'],
     setupTestFrameworkScriptFile: '<rootDir>/test-setup/setup-globals.js',
 });