add test for problem 623

Author: RexWzh

src/problems/623.add-one-row-to-tree.jl

@@ -93,8 +93,8 @@ function add_one_row!(root::TreeNode, val::Int, depth::Int)
         queue = [root]
         for _ in 1:(depth - 2), _ in eachindex(queue)
             node = popfirst!(queue)
-            isnothing(node.left) || (push!(queue, node.left))
-            isnothing(node.right) || (push!(queue, node.right))
+            isnothing(node.left) || push!(queue, node.left)
+            isnothing(node.right) || push!(queue, node.right)
         end
         for node in queue
             left, right = node.left, node.right

test/problems/623.add-one-row-to-tree.jl

@@ -9,4 +9,8 @@
         add_one_row!(root, val, depth) ==
         TreeNode{Int}([4, 2, nothing, 1, 1, 3, nothing, nothing, 1])
     end
+    @test begin
+        root, val, depth = TreeNode{Int}([4, 2, 6, 3, 1, 5]), 1, 1
+        add_one_row!(root, val, depth) == TreeNode{Int}([1, 4, nothing, 2, 6, 3, 1, 5])
+    end
 end