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
|
package rulesfn
import (
"testing"
"github.com/aws/smithy-go/ptr"
)
func TestSubString(t *testing.T) {
cases := map[string]struct {
input string
start, stop int
reverse bool
expect *string
}{
"prefix": {
input: "abcde", start: 0, stop: 3, reverse: false,
expect: ptr.String("abc"),
},
"prefix max-ascii": {
input: "abcde\u007F", start: 0, stop: 3, reverse: false,
expect: ptr.String("abc"),
},
"suffix reverse": {
input: "abcde", start: 0, stop: 3, reverse: true,
expect: ptr.String("cde"),
},
"too long": {
input: "ab", start: 0, stop: 3, reverse: false,
expect: nil,
},
"invalid start index": {
input: "ab", start: -1, stop: 3, reverse: false,
expect: nil,
},
"invalid stop index": {
input: "ab", start: 0, stop: 0, reverse: false,
expect: nil,
},
"non-ascii": {
input: "ab🐱", start: 0, stop: 1, reverse: false,
expect: nil,
},
}
for name, c := range cases {
t.Run(name, func(t *testing.T) {
actual := SubString(c.input, c.start, c.stop, c.reverse)
if c.expect == nil {
if actual != nil {
t.Fatalf("expect no result, got %v", *actual)
}
return
}
if actual == nil {
t.Fatalf("expect result, got none")
}
if e, a := *c.expect, *actual; e != a {
t.Errorf("expect %q, got %q", e, a)
}
})
}
}
|
