Find function unit test

A unit test for a find function can be written using a testing framework like JUnit in Java. Here is an example of a unit test for a find function that searches for a specific element in an array:

```java
import static org.junit.jupiter.api.Assertions.assertEquals;
import org.junit.jupiter.api.Test;

public class FindTest {

@Test
public void testFindElement() {
int[] arr = {1, 2, 3, 4, 5};
int element = 3;
int expectedIndex = 2;

int actualIndex = find(arr, element);

assertEquals(expectedIndex, actualIndex, "Element not found in array");
}

public int find(int[] arr, int element) {
for (int i = 0; i < arr.length; i++) {
if (arr[i] == element) {
return i;
}
}

return -1;
}
}
```

In this test, we have an array {1, 2, 3, 4, 5} and we are searching for the element 3. The `find` function iterates through the array and returns the index of the element if found, or -1 if not found. The test checks if the actual index returned by the `find` function matches the expected index.