How to use unit tests for an array?

Question

Java

Hello! I'm new to Java.
Task
I have created a two-dimensional array from the consoles, it can be filled, the whole function is in the main method.
Question:
How can you unit test the main method with a two-dimensional array?

Answer 1

unit tests are written not for arrays but for methods, call the method giving boundary values ​​(and null), and check that it returns the correct result...