Junit Testing void 2D array

Question

I'm just starting out with testing.

The method I'm trying to test has no return value (void), but it creates a static 2D array (char[][]) in its own class, so from what I understand, that is its side effect.

Here is some mock code:

public class MyClass{

    public static char[][] table;

    public void setTable(int rows, int columns, int number){
        board = new char[n][m];
        // more code that alters the table in a specific way, 
        // depending on the 3rd parameter
    }

Now for the testing, I was thinking of doing something like:

public class SetTableTest{

    @Test
    public void test(){
        MyClass test = new MyClass();
        assertArrayEquals(**********, test.table);
    }
}

I have 2 questions:

1. Am I allowed comparing to a static variable like I did (test.table) ie. will that actually return an "instance" of the completed table?

2. I'm fairly certain that there's no assertArrayEquals equivalent for 2D arrays, so how do I go about this?

Answer 1

The answer is already given, but for the sake of other users I am going to add another approach.

To compare two arrays, double[][] arr1, arr2, one may use Arrays.deepequals(arr1, arr2) which returns true or false. The signature of this fucntion is:

java.util.Arrays.deepEquals(Object[] a1, Object[] a2)

For a unit test a single line would then suffice:

assertTrue(Arrays.deepEquals(arr1, arr2));