* inputs and outputs

|--------+-------------|
| expect | A[]         |
|--------+-------------|
|      2 | 2, 4, 5, 6  |
|--------+-------------|
|      1 | 0, 1, 2, 5  |
|--------+-------------|
|     -1 | 2, 4, 6, 8  |
|--------+-------------|
|     -1 | empty array |
|--------+-------------|
|      0 | -1, -2, -3  |
|--------+-------------|
|      0 | 1           |
|--------+-------------|
|     -1 | 2           |
|--------+-------------|





* same thing in JUnit

assertEquals(2, ArrayStuff.indexOfFirstOdd(new int[]{2, 4, 5, 6}));
assertEquals(1, ArrayStuff.indexOfFirstOdd(new int[]{0, 1, 2, 5}));
assertEquals(-1, ArrayStuff.indexOfFirstOdd(new int[]{2, 4, 6, 8}));
assertEquals(-1, ArrayStuff.indexOfFirstOdd(new int[]{}));
assertEquals(0, ArrayStuff.indexOfFirstOdd(new int[]{-1, -2, -3}));
assertEquals(0, ArrayStuff.indexOfFirstOdd(new int[]{1}));
assertEquals(-1, ArrayStuff.indexOfFirstOdd(new int[]{2}));