diff --git a/leetcode/0859.Buddy-Strings/859.Buddy Strings_test.go b/leetcode/0859.Buddy-Strings/859.Buddy Strings_test.go
new file mode 100644
index 00000000..3085e448
--- /dev/null
+++ b/leetcode/0859.Buddy-Strings/859.Buddy Strings_test.go	
@@ -0,0 +1,56 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question859 struct {
+	para859
+	ans859
+}
+
+// para 是参数
+type para859 struct {
+	s    string
+	goal string
+}
+
+// ans 是答案
+type ans859 struct {
+	ans bool
+}
+
+func Test_Problem859(t *testing.T) {
+
+	qs := []question859{
+
+		{
+			para859{"ab", "ba"},
+			ans859{true},
+		},
+
+		{
+			para859{"ab", "ab"},
+			ans859{false},
+		},
+
+		{
+			para859{"aa", "aa"},
+			ans859{true},
+		},
+
+		{
+			para859{"aaaaaaabc", "aaaaaaacb"},
+			ans859{true},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 859------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans859, q.para859
+		fmt.Printf("【input】:%v    【output】:%v\n", p, buddyStrings(p.s, p.goal))
+	}
+	fmt.Printf("\n\n\n")
+}