-
Notifications
You must be signed in to change notification settings - Fork 0
/
validation_test.go
111 lines (90 loc) · 2.58 KB
/
validation_test.go
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
package monad_test
import (
"testing"
"github.com/denisdubochevalier/monad"
"github.com/stretchr/testify/require"
)
func TestValidationMap(t *testing.T) {
t.Parallel()
t.Run("valid", func(t *testing.T) {
t.Parallel()
is := require.New(t)
v := monad.NewValid[string, int](5)
newV := v.Map(func(x int) any { return x * 2 })
is.True(newV.Valid())
is.Equal(10, newV.Value())
})
t.Run("invalid", func(t *testing.T) {
t.Parallel()
is := require.New(t)
inv := monad.NewInvalid[string, int]([]string{"error1", "error2"})
newInv := inv.Map(func(x int) any { return x * 2 })
is.False(newInv.Valid())
is.Equal([]string{"error1", "error2"}, newInv.Errors())
})
}
func TestValidationFlatMap(t *testing.T) {
t.Parallel()
t.Run("valid", func(t *testing.T) {
t.Parallel()
is := require.New(t)
v := monad.NewValid[string, int](5)
newV := v.FlatMap(func(x int) monad.Validation[string, int] {
return monad.NewValid[string, int](x * 2)
})
is.True(newV.Valid())
is.Equal(10, newV.Value())
})
t.Run("invalid", func(t *testing.T) {
t.Parallel()
is := require.New(t)
inv := monad.NewInvalid[string, int]([]string{"error1", "error2"})
newInv := inv.FlatMap(func(x int) monad.Validation[string, int] {
return monad.NewValid[string, int](x * 2)
})
is.False(newInv.Valid())
is.Equal([]string{"error1", "error2"}, newInv.Errors())
})
}
func TestValidationMonadicLaws(t *testing.T) {
t.Parallel()
t.Run("Left Identity: return a >>= f is equivalent to f(a)", func(t *testing.T) {
t.Parallel()
is := require.New(t)
a := 5
f := func(x int) monad.Validation[string, int] {
return monad.NewValid[string, int](x * 2)
}
is.Equal(f(a).Value(), monad.NewValid[string, int](a).FlatMap(f).Value())
})
t.Run("Right Identity: m >>= return is equivalent to m", func(t *testing.T) {
t.Parallel()
is := require.New(t)
a := 5
m := monad.NewValid[string, int](a)
is.Equal(m.Value(), m.FlatMap(func(x int) monad.Validation[string, int] {
return monad.NewValid[string, int](x)
}).Value())
})
t.Run(
"Associativity: (m >>= f) >>= g is equivalent to m >>= (\\x -> f x >>= g)",
func(t *testing.T) {
t.Parallel()
is := require.New(t)
f := func(x int) monad.Validation[string, int] {
return monad.NewValid[string, int](x * 2)
}
g := func(x int) monad.Validation[string, int] {
return monad.NewValid[string, int](x + 3)
}
a := 5
m := monad.NewValid[string, int](a)
is.Equal(
m.FlatMap(f).FlatMap(g).Value(),
m.FlatMap(func(x int) monad.Validation[string, int] {
return f(x).FlatMap(g)
}).Value(),
)
},
)
}