UnhandledPromiseRejectionWarning appears even though rejection is caught

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Bug about Manual Mock

What is the current behavior?

All tests that uses a function addNewPath (ie at least 20 of the 29 tests) succeed except 2 for strange reasons … This function relies on a mock implementation of two modules : fs and filehound

If the current behavior is a bug, please provide the steps to reproduce and either a repl.it demo through https://repl.it/languages/jest or a minimal repository on GitHub that we can yarn install and yarn test.

My repo : https://github.com/jy95/mediaScan/tree/test-fix

What is the expected behavior?

It should work

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system.

Jest version : 22.3.0 Node version : 8.9.3 NPM version : 5.6.0 OS : Windows 10 Version 1709

My jest.config.js :

// jest.config.js
module.exports = {
    verbose: true,
    "moduleFileExtensions": [
        "ts",
        "tsx",
        "js"
    ],
    "transform": {
        "^.+\\.(ts|tsx)$": "<rootDir>/__tests__/__helpers__/preprocessor.js"
    },
    "testMatch": [
        "<rootDir>/__tests__/**/*.(ts|tsx|js)"
    ],
    "testPathIgnorePatterns": ["<rootDir>/node_modules/", "<rootDir>/__tests__/__helpers__/"],
    "collectCoverage": true
};

[goldel777]

I just installed jest according to the instructions. And no matter how I run it I get…

node:7364) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 3): TypeError: Cannot read property ‘Symbol(Symbol.iterator)’ of undefined (node:7364) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

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