configure testRunner to rename screenshots

repeato-example.js

// after each test run, insert ".assertion" into the filename of screenshots which have been taken during an "Assertion" AKA "Check content" step
// this way all screenshots EXCEPT assertion screenshots could be ignored with .gitignore directive:
// *screenshot.jpg
// !*screenshot.assertion.jpg

const renameScreenshots = function(testRun){
  testRun.stepResults.forEach((sr) => {
    if (sr.step.isAssertionStep) {
      const screenshotPath = testRun.getScreenshotPathByStepId(sr.step.id)
      const newFilenpath = screenshotPath.replace(".jpg", ".assertion.jpg")
      const newFilename = path.basename(newFilenpath)
      fs.renameSync(screenshotPath, newFilenpath)
      sr.setScreenshot(newFilename)
    }
  })
}

batchRunner.addOnTestFail('config', (test, testRun, stepResult) => {
  renameScreenshots(testRun)
})

batchRunner.addOnTestSuccess("config", (test, testRun) => {
  renameScreenshots(testRun)
})