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aoaox_test.go
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aoaox_test.go
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package maybe_test
import (
"errors"
"testing"
"github.com/xdg/maybe"
"github.com/xdg/testy"
)
func getAoAoXFixtures(input [][]interface{}) (good, bad maybe.AoAoX) {
good = maybe.JustAoAoX(input)
bad = maybe.ErrAoAoX(errors.New("bad interface{}s"))
return
}
func TestAoAoX(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]interface{}{
[]interface{}{23, 42},
[]interface{}{11, 13},
}
good, bad := getAoAoXFixtures(input)
var got maybe.AoAoX
var just [][]interface{}
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 interface{}s")
is.True(bad.IsErr())
got = maybe.NewAoAoX(input, nil)
is.Equal(got, good)
got = maybe.NewAoAoX(nil, err)
is.True(got.IsErr())
is.Equal(good.String(), "Just [[23 42] [11 13]]")
is.Equal(bad.String(), "Err bad interface{}s")
}
func TestAoAoXFromSlice(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]interface{}{
[]interface{}{23, 42},
[]interface{}{11, 13},
}
good := maybe.JustAoAoX(input)
var got maybe.AoAoX
// Create from slice and non-slice
goodInput := [][]int{
[]int{23, 42},
[]int{11, 13},
}
badInput1 := 42
badInput2 := []int{23, 42}
got = maybe.NewAoAoXFromSlice(goodInput, nil)
is.False(got.IsErr())
is.Equal(got, good)
got = maybe.NewAoAoXFromSlice(badInput1, nil)
is.True(got.IsErr())
got = maybe.NewAoAoXFromSlice(badInput2, nil)
is.True(got.IsErr())
got = maybe.NewAoAoXFromSlice(nil, nil)
is.True(got.IsErr())
got = maybe.NewAoAoXFromSlice(nil, errors.New("from error"))
is.True(got.IsErr())
_, err := got.Unbox()
is.Equal(err.Error(), "from error")
}
func TestAoAoXZero(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
// Check zero value case
zero := maybe.AoAoX{}
is.True(zero.IsErr())
zero.Bind(func(x [][]interface{}) maybe.AoAoX {
if x == nil {
panic("nil slice")
}
return maybe.JustAoAoX(x)
})
is.True(zero.IsErr())
_, err := zero.Unbox()
is.NotNil(err)
}
func TestAoAoXBind(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]interface{}{
[]interface{}{23, 42},
[]interface{}{11, 13},
}
good, bad := getAoAoXFixtures(input)
var got maybe.AoAoX
var just [][]interface{}
var err error
f := func(s [][]interface{}) maybe.AoAoX { return maybe.JustAoAoX(s[1:]) }
// Bind AoAoX to AoAoX; good path
got = good.Bind(f)
just, err = got.Unbox()
is.Equal(just, [][]interface{}{[]interface{}{11, 13}})
is.Nil(err)
// Bind AoAoX to AoAoX; bad path
got = bad.Bind(f)
is.True(got.IsErr())
}
func TestAoAoXJoin(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]interface{}{
[]interface{}{23, 42},
[]interface{}{11, 13},
}
good, bad := getAoAoXFixtures(input)
var got maybe.AoX
var err error
f := func(x []interface{}) maybe.X {
sum := 0
for _, v := range x {
sum += v.(int)
}
return maybe.JustX(sum)
}
// Join AoAoX to AoX; good path
got = good.Join(f)
s, err := got.Unbox()
is.Equal(s, []interface{}{65, 24})
is.Nil(err)
// Join AoAoX to AoX; bad path
got = bad.Join(f)
is.True(got.IsErr())
// Join where input is invalid
badJoin := good.Join(func(x []interface{}) maybe.X { return maybe.ErrX(errors.New("bad interface{}")) })
is.True(badJoin.IsErr())
}
func TestAoAoXMap(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]interface{}{
[]interface{}{23, 42},
[]interface{}{11, 13},
}
good, bad := getAoAoXFixtures(input)
var just [][]interface{}
var err error
// Map where everything succeeds
// Function returns first element only
f := func(xs []interface{}) maybe.AoX { return maybe.JustAoX(xs[0:1]) }
firsts := good.Map(f)
just, err = firsts.Unbox()
is.Equal(just, [][]interface{}{[]interface{}{23}, []interface{}{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 []interface{}) maybe.AoX { return maybe.ErrAoX(errors.New("bad interface{}s")) })
is.True(badMap.IsErr())
}
func TestAoAoXFlatten(t *testing.T) {
is := testy.New(t)
defer func() { t.Logf(is.Done()) }()
input := [][]interface{}{
[]interface{}{23, 42},
[]interface{}{11, 13},
}
good, bad := getAoAoXFixtures(input)
var got maybe.AoX
var just []interface{}
var err error
// Good path
got = good.Flatten()
just, err = got.Unbox()
is.Equal(just, []interface{}{23, 42, 11, 13})
is.Nil(err)
// Bad path
got = bad.Flatten()
is.True(got.IsErr())
}