diff --git a/fifo/fifo_test.go b/fifo/fifo_test.go
index 05b3bd7..5a80fb4 100644
--- a/fifo/fifo_test.go
+++ b/fifo/fifo_test.go
@@ -1,10 +1,42 @@
 package fifo_test
 
 import (
+	"cache/fifo"
 	"github.com/matryer/is"
 	"testing"
 )
 
+// TestFifo
+//
+//	@Description: 单元测试
+//	@param t
 func TestFifo(t *testing.T) {
-	is.New()
+	is := is.New(t)
+	cache := fifo.New(24, nil)
+	cache.DelOldest()
+	cache.Set("k1", 1)
+	v := cache.Get("k1")
+	is.Equal(v, 1)
+	cache.Del("k1")
+	is.Equal(0, cache.Len())
+}
+
+// TestFifoWithCallBack
+//
+//	@Description: 带删除回调
+//	@param t
+func TestFifoWithCallBack(t *testing.T) {
+	is := is.New(t)
+	keys := make([]string, 8)
+	onEvicted := func(key string, value any) {
+		keys = append(keys, key)
+	}
+	cache := fifo.New(24, onEvicted)
+	cache.Set("k1", int8(1))
+	cache.Set("k2", int8(2))
+	cache.Set("k3", int8(3))
+	cache.Set("k4", int8(4))
+	expected := []string{"k1", "k2"}
+	is.Equal(expected, keys)
+	is.Equal(2, cache.Len())
 }