1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
package liner
import (
"bytes"
"strings"
"testing"
)
func TestAppend(t *testing.T) {
var s State
s.AppendHistory("foo")
s.AppendHistory("bar")
var out bytes.Buffer
num, err := s.WriteHistory(&out)
if err != nil {
t.Fatal("Unexpected error writing history", err)
}
if num != 2 {
t.Fatalf("Expected 2 history entries, got %d", num)
}
s.AppendHistory("baz")
num, err = s.WriteHistory(&out)
if err != nil {
t.Fatal("Unexpected error writing history", err)
}
if num != 3 {
t.Fatalf("Expected 3 history entries, got %d", num)
}
s.AppendHistory("baz")
num, err = s.WriteHistory(&out)
if err != nil {
t.Fatal("Unexpected error writing history", err)
}
if num != 3 {
t.Fatalf("Expected 3 history entries after duplicate append, got %d", num)
}
s.AppendHistory("baz")
}
func TestHistory(t *testing.T) {
input := `foo
bar
baz
quux
dingle`
var s State
num, err := s.ReadHistory(strings.NewReader(input))
if err != nil {
t.Fatal("Unexpected error reading history", err)
}
if num != 5 {
t.Fatal("Wrong number of history entries read")
}
var out bytes.Buffer
num, err = s.WriteHistory(&out)
if err != nil {
t.Fatal("Unexpected error writing history", err)
}
if num != 5 {
t.Fatal("Wrong number of history entries written")
}
if strings.TrimSpace(out.String()) != input {
t.Fatal("Round-trip failure")
}
// Test reading with a trailing newline present
var s2 State
num, err = s2.ReadHistory(&out)
if err != nil {
t.Fatal("Unexpected error reading history the 2nd time", err)
}
if num != 5 {
t.Fatal("Wrong number of history entries read the 2nd time")
}
num, err = s.ReadHistory(strings.NewReader(input + "\n\xff"))
if err == nil {
t.Fatal("Unexpected success reading corrupted history", err)
}
if num != 5 {
t.Fatal("Wrong number of history entries read the 3rd time")
}
}