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aoaoi_test.go
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aoaoi_test.go
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package maybe_test
import (
"errors"
"strconv"
"testing"
"github.com/xdg/maybe"
"github.com/xdg/testy"
)
func getAoAoIFixtures(input [][]int) (good, bad maybe.AoAoI) {
good = maybe.JustAoAoI(input)
bad = maybe.ErrAoAoI(errors.New("bad ints"))
return
}
func TestAoAoI(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]int{
[]int{23, 42},
[]int{11, 13},
}
good, bad := getAoAoIFixtures(input)
var got maybe.AoAoI
var just [][]int
var err error
just, err = good.Unbox()
is.Equal(just, input)
is.Nil(err)
is.False(good.IsErr())
just, err = bad.Unbox()
is.Nil(just)
is.NotNil(err)
is.Equal(err.Error(), "bad ints")
is.True(bad.IsErr())
got = maybe.NewAoAoI(input, nil)
is.Equal(got, good)
got = maybe.NewAoAoI(nil, err)
is.True(got.IsErr())
is.Equal(good.String(), "Just [[23 42] [11 13]]")
is.Equal(bad.String(), "Err bad ints")
}
func TestAoAoIZero(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
// Check zero value case
zero := maybe.AoAoI{}
is.True(zero.IsErr())
zero.Bind(func(x [][]int) maybe.AoAoI {
if x == nil {
panic("nil slice")
}
return maybe.JustAoAoI(x)
})
is.True(zero.IsErr())
_, err := zero.Unbox()
is.NotNil(err)
}
func TestAoAoIBind(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]int{
[]int{23, 42},
[]int{11, 13},
}
good, bad := getAoAoIFixtures(input)
var got maybe.AoAoI
var just [][]int
var err error
f := func(s [][]int) maybe.AoAoI { return maybe.JustAoAoI(s[1:]) }
// Bind AoAoI to AoAoI; good path
got = good.Bind(f)
just, err = got.Unbox()
is.Equal(just, [][]int{[]int{11, 13}})
is.Nil(err)
// Bind AoAoI to AoAoI; bad path
got = bad.Bind(f)
is.True(got.IsErr())
}
func TestAoAoIJoin(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]int{
[]int{23, 42},
[]int{11, 13},
}
good, bad := getAoAoIFixtures(input)
var got maybe.AoI
var err error
f := func(x []int) maybe.I {
sum := 0
for _, v := range x {
sum += v
}
return maybe.JustI(sum)
}
// Join AoAoI to AoI; good path
got = good.Join(f)
s, err := got.Unbox()
is.Equal(s, []int{65, 24})
is.Nil(err)
// Join AoAoI to AoI; bad path
got = bad.Join(f)
is.True(got.IsErr())
// Join where input is invalid
badJoin := good.Join(func(x []int) maybe.I { return maybe.ErrI(errors.New("bad int")) })
is.True(badJoin.IsErr())
}
func TestAoAoIMap(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]int{
[]int{23, 42},
[]int{11, 13},
}
good, bad := getAoAoIFixtures(input)
var just [][]int
var err error
// Map where everything succeeds
// Function returns first element only
f := func(xs []int) maybe.AoI { return maybe.JustAoI(xs[0:1]) }
firsts := good.Map(f)
just, err = firsts.Unbox()
is.Equal(just, [][]int{[]int{23}, []int{11}})
is.Nil(err)
// Map where input is invalid
badInput := bad.Map(f)
is.True(badInput.IsErr())
// Map where function returns invalid
badMap := good.Map(func(xs []int) maybe.AoI { return maybe.ErrAoI(errors.New("bad ints")) })
is.True(badMap.IsErr())
}
func TestAoAoIFlatten(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]int{
[]int{23, 42},
[]int{11, 13},
}
good, bad := getAoAoIFixtures(input)
var got maybe.AoI
var just []int
var err error
// Good path
got = good.Flatten()
just, err = got.Unbox()
is.Equal(just, []int{23, 42, 11, 13})
is.Nil(err)
// Bad path
got = bad.Flatten()
is.True(got.IsErr())
}
func TestAoAoIToStr(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]int{
[]int{23, 42},
[]int{11, 13},
}
good, bad := getAoAoIFixtures(input)
var got maybe.AoAoS
var err error
f := func(n int) maybe.S { return maybe.JustS(strconv.Itoa(n)) }
// Convert I to S; good path
got = good.ToStr(f)
x, err := got.Unbox()
is.Equal(x, [][]string{[]string{"23", "42"}, []string{"11", "13"}})
is.Nil(err)
// Convert invalid I to S
got = bad.ToStr(f)
is.True(got.IsErr())
// Convert invalid I to S; albeit contrived
got = good.ToStr(func(x int) maybe.S { return maybe.ErrS(errors.New("invalid")) })
is.True(got.IsErr())
}