A test case is composed of 2 tests:

• a test for the IDE
• a test for validating a solution, often called validator.

IDE tests are visible to the players whereas validators are hidden.

Guidelines

• Test cases should cover all specifications

The more tests, the better.

• Test cases must have explicit names

It helps players to understand the purpose of the test.

• Each validator should check the same case as the corresponding test

They work by pairs.

• Each validator must differ from the corresponding test

It's only to ensure that the players don't harcode the solution.

• The first test case must be a simple one

It's included in the statement.