@Test void shouldConcatSeveralArrays() { // GIVEN Integer[] a = {0, 1, 2}; Integer[] b = {3, 4}; Integer[] c = {5, 6, 7, 8}; // WHEN Integer[] result = ArrayUtil.concatArrays( a, b, c ); // THEN assertEquals( a.length + b.length + c.length, result.length ); for ( int i = 0; i < result.length; i++ ) { assertEquals( (Integer) i, result[i] ); } }