Add an image test for the test engine.

racket / drracket

DrRacket, IDE for Racket

http://www.racket-lang.org/

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Add an image test for the test engine. #481

Closed shhyou closed 3 years ago

shhyou commented 3 years ago

This PR adds a minimum test related to racket/htdp#135 and racket/htdp#143 for the test engine. It check that a failing check-expect involving images should generate a non-textual output.