added unit tests

Author: albertache1998

core-kotlin-modules/core-kotlin-collections-list-2/src/test/kotlin/listOfLists/ListOfListsUnitTest.kt

@@ -1,14 +1,15 @@
 package listOfLists
 
 import org.junit.jupiter.api.Assertions.assertEquals
-import org.junit.jupiter.api.Assertions.assertTrue
 import org.junit.jupiter.api.Test
+import kotlin.test.assertTrue
 
 class ListOfListsUnitTest {
 
     @Test
     fun `test creating a list of lists using listOf()`() {
         val listOfLists = listOf(listOf(1, 2, 3), listOf(4, 5, 6), listOf(7, 8, 9))
+
         assertEquals(3, listOfLists.size)
         assertEquals(listOf(1, 2, 3), listOfLists[0])
         assertEquals(listOf(4, 5, 6), listOfLists[1])
@@ -27,7 +28,6 @@ class ListOfListsUnitTest {
 
     @Test
     fun `test creating a list of lists using map method`() {
-//        val listOfMutableLists = (0..2).map { mutableListOf<Int>() }
         val listOfLists = (0..2).map { _ -> (0..2).map { 0 } }
 
         assertEquals(3, listOfLists.size)