screen_evict_scratch_test.go RawHistoryFolder

1package vt
2
3import (
4	"testing"
5
6	renderer "github.com/bnema/vev-vt/core"
7)
8
9// OnLineEvicted callers may retain the slice: successive evictions must not
10// share the Screen's internal scratch row. The oracle checks the same rule
11// across scenarios but is skipped under -short; this is the -short guard.
12func TestOnLineEvictedRowsAreIndependentCopies(t *testing.T) {
13	s := NewScreen(4, 2)
14	var rows [][]renderer.Cell
15	s.OnLineEvicted = func(row []renderer.Cell) { rows = append(rows, row) }
16	s.Write([]byte("aaaa\r\nbbbb\r\ncccc\r\ndddd"))
17	if len(rows) != 2 {
18		t.Fatalf("evicted %d rows, want 2", len(rows))
19	}
20	if rows[0][0].Rune != 'a' || rows[1][0].Rune != 'b' {
21		t.Fatalf("evicted rows = %q, %q", rows[0][0].Rune, rows[1][0].Rune)
22	}
23	rows[0][0].Rune = 'z'
24	if rows[1][0].Rune != 'b' {
25		t.Fatal("evicted rows alias each other")
26	}
27}