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import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
class InversionCountTest {
@Test
void testInversionCount0() {
int[] a = {2, 3, 9, 2, 9};
assertEquals(2, InversionCount.getInversionCountFromArray(a));
}
@Test
void testInversionCount1() {
int[] a = {1, 1, 1, 1, 1};
assertEquals(0, InversionCount.getInversionCountFromArray(a));
}
@Test
void testInversionCount2() {
int[] a = {6, 5, 4, 3, 2, 1};
assertEquals(15, InversionCount.getInversionCountFromArray(a));
}
@Test
void testInversionCount3() {
int[] a = {1, 1, 1, 2, 1};
assertEquals(1, InversionCount.getInversionCountFromArray(a));
}
@Test
void testInversionCount4() {
int[] a = {2, 1, 1};
assertEquals(2, InversionCount.getInversionCountFromArray(a));
}
@Test
void testMergeSort0() {
int[] a = {2, 3, 9, 2, 9};
int[] b = {2, 2, 3, 9, 9};
assertArrayEquals(b, InversionCount.mergeSortArray(a));
}
@Test
void testMergeSort1() {
int[] a = {5, 4, 3, 2, 1};
int[] b = {1, 2, 3, 4, 5};
assertArrayEquals(b, InversionCount.mergeSortArray(a));
}
}
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