It would be better to save the results of test files into the artifacts folder instead of docs because docs is meant only for index.html that is generated by tests but used as source of https://lpelypenko.github.io/axe-html-reporter/. HTML report is saved artifacts by default.

It is easy to do just by removing const outputDir = 'docs'; line and not passing it in createHtmlReport like this:

const templatePath = path.join(__dirname, 'pageTemplateOnlyBody.html');
createHtmlReport({
    results: rawAxeResults,
    options: { projectKey: 'DEQUE', 
    customSummary, reportFileName, templatePath },
});
expect(
    fs.readFileSync(getPathToCreatedReport(reportFileName), {
        encoding: 'utf8',
    })
).toMatchSnapshot();

Thank you!