Cannot mutation test the call of a redux reducer (Typescript)

[magwas]

I am trying to set up mutation testing for a project using react, redux and typescript

The tests run fine with jest. The stryker dry run fails due to

undefinedtests/com.kodekonveyor.reacttest.ui/registerPerson.test.ts:25:51 - error TS2349: This expression is not callable.
  Not all constituents of type 'void | ActionCreatorWithOptionalPayload<Person, "/addPerson" | "testApp/addPerson">' are callable.
 Type 'void' has no call signatures.

  expect(dispatch).toHaveBeenCalledWith(actions.addPerson(formState))

actions.addPerson is defined by the following code:

const appState = createSlice({
  name: 'testApp',
  initialState: initialState,
  reducers: {
    addPerson: addPerson
  },
})
export const actions = appState.actions

You can find the code at commit 7fdc9e330cd3fcb12fab90711504608cdca00eda of https://github.com/magwas/reacttest

It is small experimental code, not much more than needed to reproduce the error.

Stryker config

{
  "$schema": "./node_modules/@stryker-mutator/core/schema/stryker-schema.json",
  "packageManager": "npm",
  "reporters": [
    "html",
    "clear-text",
    "progress"
  ],
  "testRunner": "jest",
  "coverageAnalysis": "perTest"
}
}

Test runner config

jest.config.js ''' /** @type {import('ts-jest').JestConfigWithTsJest} */ module.exports = { preset: 'ts-jest', testEnvironment: 'node', }; '''

Stryker environment

├── @stryker-mutator/[email protected]
├── @stryker-mutator/[email protected]

├── @stryker-mutator/[email protected]
├── @types/[email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]

Test runner environment

$ npm run test

> [email protected] test
> jest

 PASS  tests/com.kodekonveyor.reacttest.ui/registerPerson.test.ts
  registerPerson
    ✓ prevents automatic redraw of the form (2 ms)
    ✓ adds the person from the form to the person list (1 ms)
    ✓ reinitializes the form data

Test Suites: 1 passed, 1 total
Tests:       3 passed, 3 total
Snapshots:   0 total
Time:        2.486 s, estimated 5 s
Ran all test suites.

Your Environment

software	version(s)
node	v19.2.0
npm	8.19.3
Operating System	Ubuntu jammy

Add stryker.log

[magwas]

stryker.log

[stale[bot]]

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