stryker-js: Since upgrading to Stryker version 1.3 it can't find any tests to run

Summary

I upgraded the following from version 1.2 to 1.3

@stryker-mutator/core
@stryker-mutator/javascript-mutator
@stryker-mutator/mocha-framework
@stryker-mutator/mocha-runner

and now running npx stryker run reports “No tests were executed. Stryker will exit prematurely. Please check your configuration.”

Stryker config

module.exports = function(config) {
  config.set({
    mutate: [
      'src/**/*.js',
      '!src/defaults.js',
      '!src/errors.js',
      '!src/index.js'
    ],
    mutator: 'javascript',
    packageManager: 'npm',
    reporters: ['clear-text', 'progress'],
    testRunner: 'mocha',
    mochaOptions: {
      files: ['test/unit/**/*.test.js'],
      require: ['test/unit/testHelper.js']
    },
    transpilers: [],
    testFramework: 'mocha',
    coverageAnalysis: 'perTest',
    thresholds: { high: 80, low: 70, break: null }
  })
}

Stryker environment

├─┬ @stryker-mutator/core@1.3.0
│ ├─┬ @stryker-mutator/api@1.3.0
│ ├── @stryker-mutator/util@1.3.0
├─┬ @stryker-mutator/javascript-mutator@1.3.0
│ ├── @stryker-mutator/api@1.3.0 deduped
├─┬ @stryker-mutator/mocha-framework@1.3.0
│ └── @stryker-mutator/api@1.3.0 deduped
├─┬ @stryker-mutator/mocha-runner@1.3.0
│ ├── @stryker-mutator/api@1.3.0 deduped

mocha@6.1.4

Test runner environment

    "test:unit": "find ./test/unit -name '*.test.js' | NODE_ENV=test xargs mocha --require ./test/unit/testHelper.js",
    "test:mutants": "NODE_ENV=test NODE_PATH=. npx stryker run"

Your Environment

software	version(s)
node	11.14.0
npm	6.9.0
Operating System	macOS 10.14.4

Add stryker.log

11:22:36 (5300) INFO ConfigReader Using stryker.conf.js in the current working directory.
11:22:36 (5300) DEBUG ConfigReader Loading config stryker.conf.js
11:22:36 (5300) DEBUG PluginLoader Loading @stryker-mutator/* from /Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator
11:22:36 (5300) DEBUG PluginLoader Loading plugin "/Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/javascript-mutator" (matched with expression @stryker-mutator/*)
11:22:36 (5300) DEBUG PluginLoader Loading plugin "/Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/mocha-framework" (matched with expression @stryker-mutator/*)
11:22:36 (5300) DEBUG PluginLoader Loading plugin "/Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/mocha-runner" (matched with expression @stryker-mutator/*)
11:22:36 (5300) DEBUG PluginLoader Loading plugins /Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/javascript-mutator
11:22:36 (5300) DEBUG PluginLoader Loading plugins /Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/mocha-framework
11:22:36 (5300) DEBUG PluginLoader Loading plugins /Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/mocha-runner
11:22:37 (5300) DEBUG PluginLoader Loading plugins /Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/core/src/reporters/index.js
11:22:37 (5300) DEBUG MochaOptionsLoader Mocha >= 6 detected. Using mocha's `loadOptions` to load mocha options
11:22:37 (5300) DEBUG MochaOptionsLoader Loaded options: {
  "require": [
    "test/unit/testHelper.js"
  ],
  "extension": [
    "js"
  ],
  "timeout": 2000,
  "ui": "bdd"
}
11:22:37 (5300) DEBUG BroadcastReporter Broadcasting to reporters ["clear-text","progress"]
11:22:37 (5300) INFO InputFileResolver Found 3 of 29 file(s) to be mutated.
11:22:37 (5300) DEBUG InputFileResolver All input files: [
  "/Users/davesag/src/personal/amqp-delegate/.circleci/config.yml",
  "/Users/davesag/src/personal/amqp-delegate/.editorconfig",
  "/Users/davesag/src/personal/amqp-delegate/.eslintrc.js",
  "/Users/davesag/src/personal/amqp-delegate/.gitignore",
  "/Users/davesag/src/personal/amqp-delegate/.prettierignore",
  "/Users/davesag/src/personal/amqp-delegate/CONTRIBUTING.md",
  "/Users/davesag/src/personal/amqp-delegate/LICENSE",
  "/Users/davesag/src/personal/amqp-delegate/README.md",
  "/Users/davesag/src/personal/amqp-delegate/config.yml",
  "/Users/davesag/src/personal/amqp-delegate/docker-compose.yml",
  "/Users/davesag/src/personal/amqp-delegate/package-lock.json",
  "/Users/davesag/src/personal/amqp-delegate/package.json",
  "/Users/davesag/src/personal/amqp-delegate/src/attachEvents.js",
  "/Users/davesag/src/personal/amqp-delegate/src/defaults.js",
  "/Users/davesag/src/personal/amqp-delegate/src/errors.js",
  "/Users/davesag/src/personal/amqp-delegate/src/index.js",
  "/Users/davesag/src/personal/amqp-delegate/src/makeDelegator.js",
  "/Users/davesag/src/personal/amqp-delegate/src/makeWorker.js",
  "/Users/davesag/src/personal/amqp-delegate/stryker.conf.js",
  "/Users/davesag/src/personal/amqp-delegate/test/.eslintrc.js",
  "/Users/davesag/src/personal/amqp-delegate/test/integration/delegateAsyncTask.test.js",
  "/Users/davesag/src/personal/amqp-delegate/test/integration/delegateManyTasks.test.js",
  "/Users/davesag/src/personal/amqp-delegate/test/integration/delegateTask.test.js",
  "/Users/davesag/src/personal/amqp-delegate/test/integration/testHelper.js",
  "/Users/davesag/src/personal/amqp-delegate/test/unit/attachEvents.test.js",
  "/Users/davesag/src/personal/amqp-delegate/test/unit/fakes.js",
  "/Users/davesag/src/personal/amqp-delegate/test/unit/makeDelegator.test.js",
  "/Users/davesag/src/personal/amqp-delegate/test/unit/makeWorker.test.js",
  "/Users/davesag/src/personal/amqp-delegate/test/unit/testHelper.js"
]
11:22:37 (5300) DEBUG InputFileResolver Files to mutate: [
  "/Users/davesag/src/personal/amqp-delegate/src/attachEvents.js",
  "/Users/davesag/src/personal/amqp-delegate/src/makeDelegator.js",
  "/Users/davesag/src/personal/amqp-delegate/src/makeWorker.js"
]
11:22:37 (5300) DEBUG TestFrameworkOrchestrator Using testFramework mocha based on `testFramework` setting
11:22:37 (5300) INFO InitialTestExecutor Starting initial test run. This may take a while.
11:22:37 (5300) DEBUG Sandbox Creating a sandbox for files in /Users/davesag/src/personal/amqp-delegate/.stryker-tmp/sandbox7133032
11:22:37 (5300) DEBUG Sandbox Creating test runner 0
11:22:37 (5300) DEBUG ChildProcessProxy Starting /Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/core/src/test-runner/ChildProcessTestRunnerWorker.js in child process 5304
11:22:37 (5300) DEBUG InitialTestExecutor Adding test hooks for coverageAnalysis "perTest".
11:22:37 (5300) DEBUG TimeoutDecorator Starting timeout timer (300000 ms) for a test run
11:22:37 (5304) DEBUG ChildProcessProxyWorker Changing current working directory for this process to /Users/davesag/src/personal/amqp-delegate/.stryker-tmp/sandbox7133032
11:22:37 (5304) DEBUG PluginLoader Loading @stryker-mutator/* from /Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator
11:22:37 (5304) DEBUG PluginLoader Loading plugin "/Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/javascript-mutator" (matched with expression @stryker-mutator/*)
11:22:37 (5304) DEBUG PluginLoader Loading plugin "/Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/mocha-framework" (matched with expression @stryker-mutator/*)
11:22:37 (5304) DEBUG PluginLoader Loading plugin "/Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/mocha-runner" (matched with expression @stryker-mutator/*)
11:22:37 (5304) DEBUG PluginLoader Loading plugins /Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/javascript-mutator
11:22:37 (5304) DEBUG PluginLoader Loading plugins /Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/mocha-framework
11:22:37 (5304) DEBUG PluginLoader Loading plugins /Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/mocha-runner
11:22:37 (5304) DEBUG PluginLoader Loading plugins /Users/davesag/src/personal/amqp-delegate/node_modules/@stryker-mutator/core/src/reporters/index.js
11:22:37 (5304) DEBUG MochaTestRunner Mocha >= 6 detected. Using mocha's `handleFiles` to load files
11:22:37 (5304) DEBUG MochaTestRunner Starting Mocha test run
11:22:37 (5304) DEBUG MochaTestRunner Mocha test run completed: 0/0 passed
11:22:37 (5300) DEBUG ChildProcessProxy Disposing of worker process 5304
11:22:37 (5300) DEBUG ChildProcessProxy Kill 5304
11:22:37 (5300) WARN InitialTestExecutor No tests were executed. Stryker will exit prematurely. Please check your configuration.
11:22:37 (5300) INFO MutatorFacade 72 Mutant(s) generated