Running a global test setup before each test in Jest

You could use setupFilesAfterEnv (which replaces setupTestFrameworkScriptFile, deprecated from jest version 24.x) which will run before each test

// package.json
{
  // ...
  "jest": {
    "setupFilesAfterEnv": ["<rootDir>/setupTests.js"]
  }
}

And in setupTests.js, you can directly write:

global.beforeEach(() => {
  ...
});

global.afterEach(() => {
   ...
});

Just as a follow-up to the answer from @zzz, the more recent documentation on Configuring Jest notes:

Note: setupTestFrameworkScriptFile is deprecated in favor of setupFilesAfterEnv.

So now, your file should look like this:

// package.json
{
  // ...
  "jest": {
    "setupFilesAfterEnv": [
      "<rootDir>/setupTests.js"
    ]
  } 
}

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