[FIXED] Testing array length in jUnit5

Issue

I have this problem where I have to test if an array has a length of 3.

private Number[] number;

Here's my test to check if my array has a length of 3

@Test
void arrayHasALengthOf3(){
     Number[] number;

     assertTrue(number == 3);
}

I don't really know how I can solve this so can you guys help me out ...

Solution

One of the possible solutions.

@Test
void arrayHasALengthOf3() {
   final int EXPECTED_LENGTH = 3;
   Number[] number = new Number[EXPECTED_LENGTH]; // you need to initialize it.

   // Use number.length to get the length of the array.
   assertEquals(number.length, EXPECTED_LENGTH);
}

You can either initialize the array with a class that contains Number[] in it.

Your main problem was how you defined the array & how you check for the length.

Answered By - Math
Answer Checked By - David Marino (JavaFixing Volunteer)