Dealing with Screenshots

Screenshots can be useful in testing as they can help to ensure proper rendering and identify regressions over time (when comparing screenshots from different runs).

SaveScreenshot filename

This function saves a screenshot to the file that you specified in the argument. The file should have a PNG extension.

z←ref CompareScreenshots file

This function compares the screenshots in the two files given in the left and right argument. If they are the same, z←0. If they differ, z←1 and a file indicating the differences will be created (named like file2 with a suffix "-diff").