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i_test.go
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i_test.go
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package maybe_test
import (
"errors"
"fmt"
"testing"
"github.com/xdg/maybe"
"github.com/xdg/testy"
)
func TestInt(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
var good, bad, got maybe.I
var just int
var err error
good = maybe.JustI(42)
just, err = good.Unbox()
is.Equal(just, 42)
is.Nil(err)
is.False(good.IsErr())
bad = maybe.ErrI(errors.New("bad int"))
just, err = bad.Unbox()
is.Equal(just, 0)
is.NotNil(err)
is.Equal(err.Error(), "bad int")
is.True(bad.IsErr())
got = maybe.NewI(42, nil)
is.Equal(got, good)
got = maybe.NewI(0, err)
is.True(got.IsErr())
is.Equal(good.String(), "Just 42")
is.Equal(bad.String(), "Err bad int")
}
func TestIntBind(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
var good, bad, got maybe.I
var just int
var err error
good = maybe.JustI(42)
bad = maybe.ErrI(errors.New("bad int"))
f := func(x int) maybe.I { return maybe.JustI(-x) }
// Bind I to I; good path
got = good.Bind(f)
just, err = got.Unbox()
is.Equal(just, -42)
is.Nil(err)
// Bind I to I; bad path
got = bad.Bind(f)
is.True(got.IsErr())
}
func TestIntSplit(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
var good, bad maybe.I
var got maybe.AoI
var err error
good = maybe.JustI(42)
bad = maybe.ErrI(errors.New("bad int"))
f := func(x int) maybe.AoI { return maybe.JustAoI([]int{x / 10, x % 10}) }
// Split I to AoI
got = good.Split(f)
aos, err := got.Unbox()
is.Equal(aos, []int{4, 2})
is.Nil(err)
// Split I to AoI
got = bad.Split(f)
is.True(got.IsErr())
}
func TestIntToString(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
var good, bad maybe.I
var got maybe.S
var err error
good = maybe.JustI(42)
bad = maybe.ErrI(errors.New("bad int"))
f := func(x int) maybe.S { return maybe.JustS(fmt.Sprintf("%d", x)) }
// Convert I to S; good path
got = good.ToStr(f)
s, err := got.Unbox()
is.Equal(s, "42")
is.Nil(err)
// Convert S to I; bad path
got = bad.ToStr(f)
is.True(got.IsErr())
}