Set up mutation tests

[thewilkybarkid]

Configures and runs Stryker, a mutation tester.

[thewilkybarkid]

Stryker isn't working with Jest 25.1.0 (stryker-mutator/stryker-js#1983), but https://github.com/libero/article-store/pull/167/checks?check_run_id=407401318#step:5:17 is green when it shouldn't be.

[nlisgo]

Stryker isn't working with Jest 25.1.0 (stryker-mutator/stryker#1983), but https://github.com/libero/article-store/pull/167/checks?check_run_id=407401318#step:5:17 is green when it shouldn't be.

I just ran this locally and can confirm that after running make mutation-test although errors are displayed the scripts exits with code 0.

➜  article-store git:(stryker) ✗ make mutation-testdocker-compose --file .docker/docker-compose.yml --file .docker/docker-compose.dev.yml run --rm app npm run test:mutation

> @ test:mutation /app
> stryker run

12:31:14 (17) INFO ConfigReader Using stryker.conf.js in the current working directory.
12:31:14 (17) INFO TypescriptConfigEditor Loading tsconfig file /app/tsconfig.json
12:31:14 (17) INFO InputFileResolver Found 22 of 42 file(s) to be mutated.
12:31:14 (17) INFO InitialTestExecutor Starting initial test run. This may take a while.
12:31:17 (17) ERROR InitialTestExecutor One or more tests resulted in an error:
        Test runner crashed. Tried twice to restart it without any luck. Last time the error message was: Error: TypeError: Cannot read property 'runCLI' of undefined
TypeError: Cannot read property 'runCLI' of undefined
    at JestPromiseTestAdapter.run (/app/node_modules/@stryker-mutator/jest-runner/src/jestTestAdapters/JestPromiseTestAdapter.js:17:31)
    at JestTestRunner.run (/app/node_modules/@stryker-mutator/jest-runner/src/JestTestRunner.js:43:56)
    at ChildProcessTestRunnerWorker.run (/app/node_modules/@stryker-mutator/core/src/test-runner/ChildProcessTestRunnerWorker.js:24:56)
    at ChildProcessProxyWorker.doCall (/app/node_modules/@stryker-mutator/core/src/child-proxy/ChildProcessProxyWorker.js:75:56)
    at Promise.then.send.correlationId (/app/node_modules/@stryker-mutator/core/src/child-proxy/ChildProcessProxyWorker.js:46:53)
    at new Promise (<anonymous>)
    at ChildProcessProxyWorker.handleMessage (/app/node_modules/@stryker-mutator/core/src/child-proxy/ChildProcessProxyWorker.js:46:17)
    at process.emit (events.js:223:5)
    at emit (internal/child_process.js:876:12)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)
Error: TypeError: Cannot read property 'runCLI' of undefined
TypeError: Cannot read property 'runCLI' of undefined
    at JestPromiseTestAdapter.run (/app/node_modules/@stryker-mutator/jest-runner/src/jestTestAdapters/JestPromiseTestAdapter.js:17:31)
    at JestTestRunner.run (/app/node_modules/@stryker-mutator/jest-runner/src/JestTestRunner.js:43:56)
    at ChildProcessTestRunnerWorker.run (/app/node_modules/@stryker-mutator/core/src/test-runner/ChildProcessTestRunnerWorker.js:24:56)
    at ChildProcessProxyWorker.doCall (/app/node_modules/@stryker-mutator/core/src/child-proxy/ChildProcessProxyWorker.js:75:56)
    at Promise.then.send.correlationId (/app/node_modules/@stryker-mutator/core/src/child-proxy/ChildProcessProxyWorker.js:46:53)
    at new Promise (<anonymous>)
    at ChildProcessProxyWorker.handleMessage (/app/node_modules/@stryker-mutator/core/src/child-proxy/ChildProcessProxyWorker.js:46:17)
    at process.emit (events.js:223:5)
    at emit (internal/child_process.js:876:12)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)
    at ChildProcess.<anonymous> (/app/node_modules/@stryker-mutator/core/src/child-proxy/ChildProcessProxy.js:133:68)
    at ChildProcess.emit (events.js:223:5)
    at emit (internal/child_process.js:876:12)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)
12:31:17 (17) ERROR StrykerCli an error occurred Error: Something went wrong in the initial test run
    at InitialTestExecutor.validateResult (/app/node_modules/@stryker-mutator/core/src/process/InitialTestExecutor.js:86:15)
    at InitialTestExecutor.run (/app/node_modules/@stryker-mutator/core/src/process/InitialTestExecutor.js:41:14)
    at async Stryker.runMutationTest (/app/node_modules/@stryker-mutator/core/src/Stryker.js:54:38)
12:31:17 (17) INFO StrykerCli Trouble figuring out what went wrong? Try `npx stryker run --fileLogLevel trace --logLevel debug` to get some more info.
➜  article-store git:(stryker) echo $?           
0

[nlisgo]

See: stryker-mutator/stryker-js#220

See: stryker-mutator/stryker-js#1983 (comment)

[thewilkybarkid]

Stryker 3.0 has been released, which is compatible with Jest 25.1.