Ghost/ghost/core/test/utils/mocha-retry-reporter.js

const _ = require('lodash');
const core = require('@actions/core');
const mocha = require('mocha');

// From https://github.com/findmypast-oss/mocha-json-streamier-reporter/blob/master/lib/parse-stack-trace.js
function extractModuleLineAndColumn(stackTrace) {
    const matches = /^\s*at Context.* \(([^\(\)]+):([0-9]+):([0-9]+)\)/gm.exec(stackTrace);

    if (matches === null) {
        return {};
    }

    return {
        file: matches[1],
        line: parseInt(matches[2]),
        col: parseInt(matches[3])
    };
}

module.exports = class RetryReporter extends mocha.reporters.Spec {
    constructor(runner) {
        super(runner);

        if (!process.env.CI || !process.env.GITHUB_ACTIONS) {
            return;
        }

        if (runner.suite.retries() === 0) {
            return;
        }

        const retriedTests = [];
        const failedTests = [];

        runner
            .on(mocha.Runner.constants.EVENT_TEST_RETRY, (test, err) => {
                // eslint-disable-next-line no-console
                console.log(`Retrying '${test.fullTitle()}' due to '${err.message}'`);
                retriedTests.push({test, err});
            })
            .on(mocha.Runner.constants.EVENT_TEST_FAIL, (test, err) => {
                failedTests.push({test, err});
            })
            .on(mocha.Runner.constants.EVENT_RUN_END, () => {
                _.uniqWith(retriedTests
                    .filter(({test}) => !failedTests.find(failed => failed.test === test))
                    .map(({test, err}) => {
                        const {file, line, col} = extractModuleLineAndColumn(err.stack);

                        return {
                            file,
                            line,
                            col,
                            err: err.message,
                            testName: test.fullTitle()
                        };
                    }), _.isEqual)
                    .forEach(({file, line, col, testName, err}) => {
                        core.warning(`Retried '${testName}' due to '${err}'`, {
                            file,
                            startLine: line,
                            startColumn: col
                        });
                    });
            });
    }
};