scroll_rows_test.go RawHistoryFolder

1package copy
2
3import (
4	"math"
5	"testing"
6
7	renderer "github.com/bnema/vev-vt/ansi"
8	"github.com/stretchr/testify/require"
9)
10
11func TestScrollRowsMovesViewportImmediately(t *testing.T) {
12	rows := make([][]renderer.Cell, 100)
13	for i := range rows {
14		rows[i] = []renderer.Cell{{Rune: 'x', Style: renderer.DefaultStyle()}}
15	}
16	for _, tc := range []struct {
17		name   string
18		deltas []int
19		want   []int
20	}{
21		{"reverse", []int{-3, 3, -3, 3}, []int{87, 90, 87, 90}},
22		{"clamp", []int{math.MinInt, -1, math.MaxInt}, []int{0, 0, 90}},
23	} {
24		t.Run(tc.name, func(t *testing.T) {
25			mode := NewMode(NewDocument(NewSnapshotFromRows(rows, 1, 10), ""))
26			for i, delta := range tc.deltas {
27				mode.ScrollRows(delta)
28				require.Equal(t, tc.want[i], mode.ViewportTop)
29				require.GreaterOrEqual(t, mode.Cursor().Row, mode.ViewportTop)
30				require.Less(t, mode.Cursor().Row, mode.ViewportTop+10)
31			}
32			require.True(t, mode.AtBottom())
33		})
34	}
35}