Automatically update screenshot verification points

It is possible to force Squish to update all the screenshots used in screenshot verification points by setting the environment variable SQUISH_LEARN_SCREENSHOTS to 1.

For example, on Windows do the following:

set SQUISH_LEARN_SCREENSHOTS=1
C:\Users\MyUser\squish-4.x-qt47x-win32-msvc10\ide\squishide.exe

Then execute all the tests so that Squish will retake all the screenshots. At the end, quit Squish and start it again normally (i.e., so that there is no SQUISH_LEARN_SCREENSHOTS environment variable set), and Squish will compare screenshots as usual — only now with updated screenshots.

This feature is designed for when an application has some significant changes to its appearance that would invalidate lots of screenshot verifications.

• screenshot
• environment_variables