Import jest-extended

Author: Michal Vlasák

jest.config.js

@@ -8,4 +8,5 @@ module.exports = {
     collectCoverage: true,
     // testURL because of problems with jsdom https://github.com/jsdom/jsdom/issues/2304
     testURL: "http://localhost",
+    setupFilesAfterEnv: ['<rootDir>/src/tests/setup.ts'],
 };

src/tests/setup.ts

@@ -0,0 +1 @@
+import 'jest-extended';