Cypress json reporter does not generate output file.

[lukasdo]

Current behavior

Run cypress e2e tests with a json reporter and define an output file according to the mocha documentation. The output file will not be generated, but the json output will be printed to the console.

Desired behavior

When setting --reporter json --reporterOptions output=results.json, the output file should be generated and contain the results from the test run in JSON format.

Test code to reproduce

Create a new cypress e2e project with a single test and run the e2e suite.

Configure the cypress.config.js and set reporter: 'json' and reporterOptions: { output: 'testFile.json' }.

Or from the command line: cypress run --reporter json --reporter-options "output=testFile.json"

Or check out this repository with a single e2e test and the correct configuration.

Cypress Version

12.17.4

Node version

v.18.10.0

Operating System

macOs 13.0

Debug Logs

No response

Other

The broken json reporter has quite a history, e.g. #18014, from previous issues I could not see it working for anyone. Previously there was some misunderstanding as the property to set the output file on the mocha side was renamed to reporterOption while the cypress configuration is named reporterOptions. Although mocha has made some fixes in their project, the output file still does not work. In my opinion this is because the mocha version in packages/server/package.json is set to 7.1.0. In mocha 7.1.0 the output file is not supported.