public void Swap2ElementsLI()
{
// arrange
var head = new ListNode(1)
{
Next = new ListNode(2)
};
var expectedHead = new ListNode(2)
{
Next = new ListNode(1)
};
// act
ListNode newHead = SwapNodesInPairs.SwapPairs(head);
// assert
ListNode expectedNode = expectedHead, foundNode = newHead;
while (expectedNode != null && foundNode != null)
{
Assert.AreEqual(expectedNode.Val, foundNode.Val);
expectedNode = expectedNode.Next;
foundNode = foundNode.Next;
}
Assert.IsNull(expectedNode); // both of them should be null
Assert.IsNull(foundNode);
}
public void SwapNodesInPairsTestCase4()
{
var list = CommonHelpers.GetLinkedListFromArray(new[] { 1, 2, 3 });
var result = SwapNodesInPairs.SwapPairs(list).ValuesToFlatList();
result.SequenceEqual(new[] { 2, 1, 3 }).Should().BeTrue();
}
public void Given_list_node_When_swap_Then_return()
{
ListNode node = new ListNode(1)
{
next = new ListNode(2)
{
next = new ListNode(3)
{
next = new ListNode(4)
}
}
};
var result = SwapNodesInPairs.SwapPairs(node);
Assert.AreEqual(2, result.val);
Assert.AreEqual(1, result.next.val);
Assert.AreEqual(4, result.next.next.val);
Assert.AreEqual(3, result.next.next.next.val);
}
public void SwapNodesInPairsTestCase2()
{
var result = SwapNodesInPairs.SwapPairs(null);
result.Should().BeNull();
}
