You have a Web-CAT assignment that uses instructor-written reference tests and you want to add hints to your reference tests to help students figure out what is wrong with their code or their understanding of the behavior required in your assignment.
If you have not gone through the Sigcse2007Workshop, take a look at Sigcse2007Workshop/ Grading Options. That workshop exercise explains how to add basic hints to Java assignments.
Afterward, read Java Tdd Plugin / Hint Control to learn about other controls, including how to suppress hints when needed (for a single test case method, or an entire test class), how to give different weights to tests, and more.
The discussion discusses tradeoffs inherent in the solution and other possible solutions
Sigcse2007Workshop/ Grading Options
Java Tdd Plugin / Hint Control
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