Hidden test cases include your test setter's corner cases or different scenarios defined to validate your coding solution. These test cases check whether your solution addresses the problem including its various constraints, but do not display the expected output of the test case.
If you are a Recruiter using HackerRank for Work and looking for information about Test Cases, refer to the Defining Test Cases for Coding Questions topic.)
Hidden Test Cases
For instance, the hidden test cases may be defined to validate your coding logic against boundary values, error handling scenarios, etc. Depending on the complexity of the coding Question or for specific skills assessment, your test setter may include one or more hidden test cases for your question.
When you click Run code, the hidden test cases get executed and your output and debug output are displayed. You may use the print statement to debug why the hidden test cases are failing.
Typically, each hidden test case in a Coding question may include specific scores for producing the exact expected output.
In the following example, the Hidden test cases are executed and your output and debug output are displayed.
You can also refer to these topics for further information