diff --git a/slice/slice_test.go b/slice/slice_test.go
index f448b51..e7471ac 100644
--- a/slice/slice_test.go
+++ b/slice/slice_test.go
@@ -538,3 +538,11 @@ func TestIndexOf(t *testing.T) {
 	assert.Equal(0, IndexOf(arr, "a"))
 	assert.Equal(-1, IndexOf(arr, "d"))
 }
+
+func TestLastIndexOf(t *testing.T) {
+	assert := internal.NewAssert(t, "TestLastIndexOf")
+
+	arr := []string{"a", "a", "b", "c"}
+	assert.Equal(1, LastIndexOf(arr, "a"))
+	assert.Equal(-1, IndexOf(arr, "d"))
+}