NewExecutor creates an Executor, generic type T is the input type, generic type Y is the want type.

WithComparison is an option to set the comparison function, generic type T is the input type, generic type Y is the output type.

Data represents a test case, generic type T is the input type, generic type Y is the want type.

Executor manages and executes test cases, generic type T is the input type, generic type Y is the want type.

Option represents an option for Executor, generic type T is the input type, generic type Y is the want type.