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|
package framing_test
import (
"errors"
"fmt"
"io"
"reflect"
"testing"
. "github.com/mesos/mesos-go/api/v1/lib/encoding/framing"
)
func TestNewDecoder(t *testing.T) {
var (
byteCopy = UnmarshalFunc(func(b []byte, m interface{}) error {
if m == nil {
return errors.New("unmarshal target may not be nil")
}
v, ok := m.(*[]byte)
if !ok {
return fmt.Errorf("expected *[]byte instead of %T", m)
}
if v == nil {
return errors.New("target *[]byte may not be nil")
}
*v = append((*v)[:0], b...)
return nil
})
fakeError = errors.New("fake unmarshal error")
errorUnmarshaler = UnmarshalFunc(func(_ []byte, _ interface{}) error {
return fakeError
})
)
for ti, tc := range []struct {
r Reader
uf UnmarshalFunc
wants [][]byte
wantsErr error
}{
{errorReader(ErrorBadSize), byteCopy, nil, ErrorBadSize},
{tokenReader("james"), byteCopy, frames("james"), nil},
{tokenReader("james", "foo"), byteCopy, frames("james", "foo"), nil},
{tokenReader("", "foo"), byteCopy, frames("", "foo"), nil},
{tokenReader("foo", ""), byteCopy, frames("foo", ""), nil},
{tokenReader(""), byteCopy, frames(""), nil},
{tokenReader(), byteCopy, frames(), io.EOF},
{tokenReader("james"), errorUnmarshaler, nil, fakeError},
} {
t.Run(fmt.Sprintf("test case %d", ti), func(t *testing.T) {
if (tc.wants == nil) != (tc.wantsErr != nil) {
t.Fatalf("invalid test case: cannot expect both data and an error")
}
var (
f [][]byte
d = NewDecoder(tc.r, tc.uf)
err error
)
for err == nil {
var buf []byte
err = d.Decode(&buf)
if err == io.EOF {
break
}
if err == nil {
f = append(f, buf)
}
if err != tc.wantsErr {
t.Errorf("expected error %q instead of %q", tc.wantsErr, err)
}
}
if !reflect.DeepEqual(f, tc.wants) {
t.Errorf("expected %#v instead of %#v", tc.wants, f)
}
})
}
}
func tokenReader(s ...string) ReaderFunc {
if len(s) == 0 {
return EOFReaderFunc
}
ch := make(chan []byte, len(s))
for i := range s {
ch <- ([]byte)(s[i])
}
return func() ([]byte, error) {
select {
case b := <-ch:
return b, nil
default:
return nil, io.EOF
}
}
}
func errorReader(err error) ReaderFunc {
return func() ([]byte, error) { return nil, err }
}
func frames(s ...string) (f [][]byte) {
if len(s) == 0 {
return nil
}
f = make([][]byte, 0, len(s))
for i := range s {
// converting to/from []byte and string for empty string isn't a perfectly symmetrical
// operation. fix it up here with a quick length check.
if len(s[i]) == 0 {
f = append(f, nil)
continue
}
f = append(f, ([]byte)(s[i]))
}
return
}
|
