diff --git a/leetcode/0559.Maximum-Depth-of-N-ary-Tree/559.Maximum Depth of N-ary Tree_test.go b/leetcode/0559.Maximum-Depth-of-N-ary-Tree/559.Maximum Depth of N-ary Tree_test.go
new file mode 100644
index 00000000..90da19b3
--- /dev/null
+++ b/leetcode/0559.Maximum-Depth-of-N-ary-Tree/559.Maximum Depth of N-ary Tree_test.go	
@@ -0,0 +1,60 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question559 struct {
+	para559
+	ans559
+}
+
+// para 是参数
+type para559 struct {
+	root *Node
+}
+
+// ans 是答案
+type ans559 struct {
+	ans int
+}
+
+func Test_Problem559(t *testing.T) {
+
+	qs := []question559{
+
+		{
+			para559{&Node{
+				Val: 1,
+				Children: []*Node{
+					{Val: 3, Children: []*Node{{Val: 5, Children: nil}, {Val: 6, Children: nil}}},
+					{Val: 2, Children: nil},
+					{Val: 4, Children: nil},
+				},
+			}},
+			ans559{3},
+		},
+
+		{
+			para559{&Node{
+				Val: 1,
+				Children: []*Node{
+					{Val: 2, Children: nil},
+					{Val: 3, Children: []*Node{{Val: 6, Children: nil}, {Val: 7, Children: []*Node{{Val: 11, Children: []*Node{{Val: 14, Children: nil}}}}}}},
+					{Val: 4, Children: []*Node{{Val: 8, Children: []*Node{{Val: 12, Children: nil}}}}},
+					{Val: 5, Children: []*Node{{Val: 9, Children: []*Node{{Val: 13, Children: nil}}}, {Val: 10, Children: nil}}},
+				},
+			}},
+			ans559{5},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 559------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans559, q.para559
+		fmt.Printf("【input】:%v    【output】:%v\n", p, maxDepth(p.root))
+	}
+	fmt.Printf("\n\n\n")
+}