diff --git a/datastructure/hashmap/hashmap_test.go b/datastructure/hashmap/hashmap_test.go
new file mode 100644
index 0000000..56642f8
--- /dev/null
+++ b/datastructure/hashmap/hashmap_test.go
@@ -0,0 +1,20 @@
+package datastructure
+
+import (
+	"testing"
+
+	"github.com/duke-git/lancet/v2/internal"
+)
+
+func TestHashMap_PutAndGet(t *testing.T) {
+	assert := internal.NewAssert(t, "TestHashMap_Get")
+
+	hm := NewHashMap()
+
+	hm.Put("abc", 3)
+	assert.Equal(3, hm.Get("abc"))
+	assert.IsNil(hm.Get("abcd"))
+
+	hm.Put("abc", 4)
+	assert.Equal(4, hm.Get("abc"))
+}