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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
package gopter_test
import (
"reflect"
"testing"
"github.com/leanovate/gopter"
)
type counterShrink struct {
n int
}
func (c *counterShrink) Next() (interface{}, bool) {
if c.n > 0 {
v := c.n
c.n--
return v, true
}
return 0, false
}
func TestShinkAll(t *testing.T) {
counter := &counterShrink{n: 10}
shrink := gopter.Shrink(counter.Next)
all := shrink.All()
if !reflect.DeepEqual(all, []interface{}{10, 9, 8, 7, 6, 5, 4, 3, 2, 1}) {
t.Errorf("Invalid all: %#v", all)
}
}
func TestShrinkFilter(t *testing.T) {
counter := &counterShrink{n: 20}
shrink := gopter.Shrink(counter.Next)
all := shrink.Filter(func(v interface{}) bool {
return v.(int)%2 == 0
}).All()
if !reflect.DeepEqual(all, []interface{}{20, 18, 16, 14, 12, 10, 8, 6, 4, 2}) {
t.Errorf("Invalid all: %#v", all)
}
counter = &counterShrink{n: 5}
shrink = gopter.Shrink(counter.Next)
all = shrink.Filter(nil).All()
if !reflect.DeepEqual(all, []interface{}{5, 4, 3, 2, 1}) {
t.Errorf("Invalid all: %#v", all)
}
}
func TestShrinkConcat(t *testing.T) {
counterShrink1 := &counterShrink{n: 5}
counterShrink2 := &counterShrink{n: 4}
shrink1 := gopter.Shrink(counterShrink1.Next)
shrink2 := gopter.Shrink(counterShrink2.Next)
all := gopter.ConcatShrinks(shrink1, shrink2).All()
if !reflect.DeepEqual(all, []interface{}{5, 4, 3, 2, 1, 4, 3, 2, 1}) {
t.Errorf("Invalid all: %#v", all)
}
}
func TestShrinkInterleave(t *testing.T) {
counterShrink1 := &counterShrink{n: 5}
counterShrink2 := &counterShrink{n: 7}
shrink1 := gopter.Shrink(counterShrink1.Next)
shrink2 := gopter.Shrink(counterShrink2.Next)
all := shrink1.Interleave(shrink2).All()
if !reflect.DeepEqual(all, []interface{}{5, 7, 4, 6, 3, 5, 2, 4, 1, 3, 2, 1}) {
t.Errorf("Invalid all: %#v", all)
}
}
func TestCombineShrinker(t *testing.T) {
var shrinker1Arg, shrinker2Arg interface{}
shrinker1 := func(v interface{}) gopter.Shrink {
shrinker1Arg = v
shrink := &counterShrink{n: 5}
return shrink.Next
}
shrinker2 := func(v interface{}) gopter.Shrink {
shrinker2Arg = v
shrink := &counterShrink{n: 3}
return shrink.Next
}
shrinker := gopter.CombineShrinker(shrinker1, shrinker2)
all := shrinker([]interface{}{123, 456}).All()
if shrinker1Arg != 123 {
t.Errorf("Invalid shrinker1Arg: %#v", shrinker1Arg)
}
if shrinker2Arg != 456 {
t.Errorf("Invalid shrinker1Arg: %#v", shrinker1Arg)
}
if !reflect.DeepEqual(all, []interface{}{
[]interface{}{5, 456},
[]interface{}{4, 456},
[]interface{}{3, 456},
[]interface{}{2, 456},
[]interface{}{1, 456},
[]interface{}{123, 3},
[]interface{}{123, 2},
[]interface{}{123, 1},
}) {
t.Errorf("Invalid all: %#v", all)
}
}
func TestShrinkMap(t *testing.T) {
counter := &counterShrink{n: 10}
shrink := gopter.Shrink(counter.Next).Map(func(v int) int {
return 10 - v
})
all := shrink.All()
if !reflect.DeepEqual(all, []interface{}{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}) {
t.Errorf("Invalid all: %#v", all)
}
}
func TestShrinkMapNoFunc(t *testing.T) {
defer expectPanic(t, "Param of Map has to be a func, but is string")
counter := &counterShrink{n: 10}
gopter.Shrink(counter.Next).Map("not a function")
}
func TestShrinkMapTooManyParams(t *testing.T) {
defer expectPanic(t, "Param of Map has to be a func with one param, but is 2")
counter := &counterShrink{n: 10}
gopter.Shrink(counter.Next).Map(func(a, b string) string {
return ""
})
}
func TestShrinkMapToManyReturns(t *testing.T) {
defer expectPanic(t, "Param of Map has to be a func with one return value, but is 2")
counter := &counterShrink{n: 10}
gopter.Shrink(counter.Next).Map(func(a string) (string, bool) {
return "", false
})
}
func TestNoShrinker(t *testing.T) {
shrink := gopter.NoShrinker(123)
if shrink == nil {
t.Error("Shrink has to be != nil")
}
value, ok := shrink()
if ok || value != nil {
t.Errorf("Invalid shrink: %#v", value)
}
}
|
