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aoi_test.go
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aoi_test.go
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package maybe_test
import (
"errors"
"fmt"
"testing"
"github.com/xdg/maybe"
"github.com/xdg/testy"
)
func getIntFixtures(input []int) (good, bad maybe.AoI) {
good = maybe.JustAoI(input)
bad = maybe.ErrAoI(errors.New("bad int"))
return
}
func TestAoI(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := []int{23, 42}
good, bad := getIntFixtures(input)
var got maybe.AoI
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 int")
is.True(bad.IsErr())
got = maybe.NewAoI(input, nil)
is.Equal(got, good)
got = maybe.NewAoI(nil, err)
is.True(got.IsErr())
is.Equal(good.String(), "Just [23 42]")
is.Equal(bad.String(), "Err bad int")
}
func TestAoIZero(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
// Check zero value case
zero := maybe.AoI{}
is.True(zero.IsErr())
zero.Bind(func(x []int) maybe.AoI {
if x == nil {
panic("nil slice")
}
return maybe.JustAoI(x)
})
is.True(zero.IsErr())
_, err := zero.Unbox()
is.NotNil(err)
}
func TestAoIBind(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := []int{23, 42}
good, bad := getIntFixtures(input)
var got maybe.AoI
var just []int
var err error
f := func(x []int) maybe.AoI { return maybe.JustAoI(x[1:]) }
// Bind AoI to AoI; good path
got = good.Bind(f)
just, err = got.Unbox()
is.Equal(just, []int{42})
is.Nil(err)
// Bind AoI to AoI; bad path
got = bad.Bind(f)
is.True(got.IsErr())
}
func TestAoISplit(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
var got maybe.AoAoI
var err error
input := []int{23, 42}
good, bad := getIntFixtures(input)
f := func(x int) maybe.AoI { return maybe.JustAoI([]int{x}) }
// Split S to AoI
got = good.Split(f)
aoaoi, err := got.Unbox()
is.Equal(aoaoi, [][]int{[]int{23}, []int{42}})
is.Nil(err)
// Split S to AoI
got = bad.Split(f)
is.True(got.IsErr())
// Split where input is invalid
badSplit := good.Split(func(x int) maybe.AoI { return maybe.ErrAoI(errors.New("bad int")) })
is.True(badSplit.IsErr())
}
func TestAoIJoin(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := []int{23, 42}
good, bad := getIntFixtures(input)
var got maybe.I
var err error
f := func(xs []int) maybe.I {
var sum int
for _, v := range xs {
sum += v
}
return maybe.JustI(sum)
}
// Join AoI to I; good path
got = good.Join(f)
x, err := got.Unbox()
is.Equal(x, 65)
is.Nil(err)
// Join AoI to I; bad path
got = bad.Join(f)
is.True(got.IsErr())
}
func TestAoIMap(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := []int{23, 42}
good, bad := getIntFixtures(input)
var just []int
var err error
// Map where everything succeeds
neg := good.Map(func(x int) maybe.I { return maybe.JustI(-x) })
just, err = neg.Unbox()
is.Equal(just, []int{-23, -42})
is.Nil(err)
// Map where input is invalid
negBadInput := bad.Map(func(x int) maybe.I { return maybe.JustI(-x) })
is.True(negBadInput.IsErr())
// Map where function returns invalid
negBadMap := good.Map(func(x int) maybe.I { return maybe.ErrI(errors.New("bad int")) })
is.True(negBadMap.IsErr())
}
func TestAoIToString(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
var got maybe.AoS
var err error
input := []int{23, 42}
good, bad := getIntFixtures(input)
f := func(x int) maybe.S { return maybe.JustS(fmt.Sprintf("%d", x)) }
// Convert AoI to AoS; good path
got = good.ToStr(f)
s, err := got.Unbox()
is.Equal(s, []string{"23", "42"})
is.Nil(err)
// Convert AoS to AoI; bad path
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())
}