test(listx): test range

pkg/structure/listx/listx_test.go

@@ -177,3 +177,30 @@ func TestListx_Slice(t *testing.T) {
 	values, _ = list3.LPop(list3.Length())
 	require.Equal(t, values, []string{"1", "2", "3", "4"})
 }
+
+func TestListx_Range(t *testing.T) {
+	list := NewListXSingle()
+	list.RPush("a", "b", "c", "d", "e")
+	val, err := list.Range(0, 2)
+	require.NoError(t, err)
+
+	require.Equal(t, val, []string{"a", "b"})
+
+	val, err = list.Range(0, -1)
+	require.NoError(t, err)
+
+	require.Equal(t, val, []string{"a", "b", "c", "d"})
+
+	val, err = list.Range(-3, 3)
+	require.NoError(t, err)
+
+	require.Equal(t, val, []string{"c"})
+
+	val, err = list.Range(-1, list.Length())
+	require.NoError(t, err)
+
+	require.Equal(t, val, []string{})
+
+	_, err = list.Range(6, -1)
+	require.Error(t, err)
+}