Background

Currently, in the Foundry test code, normal tests have been implemented to verify whether each function operates correctly when given the correct variables. However, tests for verifying that the appropriate errors are returned when given abnormal variables or when performing operations that simulate potential attacks have not yet been implemented. These additional tests need to be added.

Plan

For issue #17, we anticipate the removal of the callback function, and since the tests will require significant refactoring after addressing this, it would be a good opportunity to add the negative tests at that time as well.