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package multierr
import (
"errors"
"testing"
"github.com/stretchr/testify/assert"
)
type errA struct{}
func (errA) Error() string { return "A" }
func TestFormat(t *testing.T) {
errB := errors.New("B")
// Single-item Format preserves the error type
res := Format("[", ",", "]", []error{errA{}})
assert.Equal(t, "A", res.Error())
var aTarget errA
assert.ErrorAs(t, res, &aTarget)
// Single-item Format preserves the error identity
res = Format("[", ",", "]", []error{errB})
assert.Equal(t, "B", res.Error())
assert.ErrorIs(t, res, errB)
// Multi-item Format preserves both
res = Format("[", ",", "]", []error{errA{}, errB})
assert.Equal(t, "[A,B]", res.Error())
assert.ErrorAs(t, res, &aTarget)
assert.ErrorIs(t, res, errB)
// This is invalid, but make sure we don’t misleadingly suceeed
res = Format("[", ",", "]", []error{})
assert.Error(t, res)
res = Format("[", ",", "]", nil)
assert.Error(t, res)
}
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