Files and folders with emoji in their paths are ignored by Stryker

[Lakitna]

Summary

I ran into this in #2417

Express has test fixtures: https://github.com/expressjs/express/tree/master/test/fixtures

These fixtures have to be copied to the sandbox for the tests to pass. So far so good. Notice that the /snow folder has an emoji in it. This causes Stryker to ignore the folder and thus not copy the file to the sandbox. This causes the initial test run to fail.

I've looked a bit further, and this is also the case for file names with emojis in them. All other files are copied to the sandbox as expected.

Now, this is a pretty obscure bug, but emoji paths are fully supported by Windows, and probably other OSs as well. Still, I'm not sure if it's worth fixing this.

Stryker config

= default init with CommonJS + Mocha

/**
 * @type {import('@stryker-mutator/api/core').StrykerOptions}
 */
module.exports = {
  logLevel: 'debug',
  "mutator": "javascript",
  "packageManager": "npm",
  "reporters": [
    "html",
    "progress"
  ],
  "testRunner": "mocha",
  "transpilers": [],
  "testFramework": "mocha",
  "coverageAnalysis": "perTest"
};

Test runner config

See https://github.com/expressjs/express

Stryker environment

    "@stryker-mutator/core": "^3.3.1",
    "@stryker-mutator/javascript-mutator": "^3.3.1",
    "@stryker-mutator/mocha-framework": "^3.3.1",
    "@stryker-mutator/mocha-runner": "^3.3.1",

See for test runner deps: https://github.com/expressjs/express

Test runner environment

See https://github.com/expressjs/express

Your Environment

software	version(s)
node	14.5.0
npm	6.14.5
Operating System	Windows 10

Add stryker.log

Note the absence of /snow

stryker.log

[nicojs]

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