import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

class testprTest {

    @Test
    void nullInArgs() {
        int[] a1 = new int[0];
        int[] a2 = new int[0];
        assertNull(testpr.merge(null, null));
        assertEquals(a1, testpr.merge(a1, null));
        assertEquals(a2, testpr.merge(null, a2));
    }

    @Test
    void emptyArray() {
        int[] a1 = new int[0];
        int[] a2 = new int[0];
        int[] a22 = new int[1];
        assertEquals(a1, testpr.merge(a1, a2));
        assertEquals(a22, testpr.merge(a1, a22));
    }

    @Test
    void Test1(){
        int[] a1 = new int[]{3,2,1};
        int[] a2 = new int[] {3,2,1};
        int[] result = new int[] {3,3,2,2,1,1};
        assertArrayEquals(result, testpr.merge(a1, a2));
    }

    @Test
    void Test2(){
        int[] a1 = new int[]{3,2,1};
        int[] a2 = new int[] {4,3,2};
        int[] result = new int[] {4,3,3,2,2,1};
        assertArrayEquals(result, testpr.merge(a1, a2));
    }


    @Test
    void Test3(){
        int[] a1 = new int[]{3,3,3,3};
        int[] a2 = new int[]{4,4};
        int[] result = new int[] {4,4,3,3,3,3};
        assertArrayEquals(result, testpr.merge(a1, a2));
    }

    @Test
    void Test4(){
        int[] a1 = new int[]{3};
        int[] a2 = new int[]{4};
        int[] result = new int[] {4,3};
        assertArrayEquals(result, testpr.merge(a1, a2));
    }

    @Test
    void Test5(){
        int[] a1 = new int[]{5,3,1};
        int[] a2 = new int[]{8,7,6,4,2};
        int[] result = new int[] {8,7,6,5,4,3,2,1};
        assertArrayEquals(result, testpr.merge(a1, a2));
    }

}