@Test
public void Test1(){
        int[] bilibu1 = {0};
    assertEquals(Exercise.binarySearch(bilibu1,0,0,2),-1);
        int[] bilibu2 = {};
    assertEquals(Exercise.binarySearch(bilibu2,0,1,2),-2);
        int[] bilibu3={0,1,2,3};
    assertEquals(Exercise.binarySearch(bilibu3,-1,2,4),-2);
        int[] bilibu5 = {0,-1,-2,-3,-4};
    assertEquals(Exercise.binarySearch(bilibu5,1,3,-2),2);
        int[] bilibu6 = {-1};
    assertEquals(Exercise.binarySearch(bilibu6,0,0,-1),0);
        int[] bilibu7 = {1,1,1,1};
    assertEquals(Exercise.binarySearch(bilibu7,0,3,1),1);
        int[] array4 = {1,2,3,4,5,6,7};
    assertEquals(Exercise.binarySearch(array4,2,6,7),6);
        int[] array = {1,2,3,4,5,6,7,8,9};
    assertEquals(Exercise.binarySearch(array,1,3,2),1);

    assertEquals(Exercise.binarySearch(array,3,5,2),-1);

    assertEquals(Exercise.binarySearch(array,-1,7,2),-2);

    assertEquals(Exercise.binarySearch(array,4,2,3),-2);

    assertEquals(Exercise.binarySearch(array,4,10,6),-2);

    int[] array1 = {};
    assertEquals(Exercise.binarySearch(array1,0,0,0),-2);

    int[] array2 = {1};
    assertEquals(Exercise.binarySearch(array2,0,0,1),0);
}