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|
package io
import (
"bytes"
"errors"
"fmt"
"io"
"testing"
)
type mockReadCloser struct {
ReadFn func([]byte) (int, error)
CloseFn func() error
}
func (m *mockReadCloser) Read(p []byte) (n int, err error) {
if m.ReadFn == nil {
return len(p), nil
}
return m.ReadFn(p)
}
func (m *mockReadCloser) Close() error {
if m.CloseFn == nil {
return nil
}
return m.CloseFn()
}
type mockWriteTo struct {
mockReadCloser
WriteToFn func(io.Writer) (int64, error)
}
func (m *mockWriteTo) WriteTo(w io.Writer) (int64, error) {
if m.WriteToFn == nil {
return 0, nil
}
return m.WriteToFn(w)
}
func TestNewSafeReadCloser(t *testing.T) {
cases := map[string]struct {
ReadCloser io.ReadCloser
ReadTest func(*testing.T, *safeReadCloser)
CloseTest func(*testing.T, *safeReadCloser)
}{
"success read and close": {
ReadCloser: &mockReadCloser{
ReadFn: func(bytes []byte) (int, error) {
bytes[0], bytes[1], bytes[2] = 'f', 'o', 'o'
return 3, nil
},
},
ReadTest: func(t *testing.T, closer *safeReadCloser) {
t.Helper()
bs := make([]byte, 3)
read, err := closer.Read(bs)
if err != nil {
t.Errorf("expect no error, got %v", err)
}
if e, a := "foo", string(bs[:read]); e != a {
t.Errorf("expect %v, got %v", e, a)
}
},
CloseTest: func(t *testing.T, closer *safeReadCloser) {
t.Helper()
if err := closer.Close(); err != nil {
t.Errorf("expect no error, got %v", err)
}
},
},
"error read": {
ReadCloser: &mockReadCloser{
ReadFn: func(bytes []byte) (int, error) {
return 0, io.ErrUnexpectedEOF
},
},
ReadTest: func(t *testing.T, closer *safeReadCloser) {
t.Helper()
_, err := closer.Read([]byte{})
if err == nil {
t.Errorf("expect error, got nil")
}
if !errors.Is(err, io.ErrUnexpectedEOF) {
t.Errorf("expect error to be type %T, got %T", io.ErrUnexpectedEOF, err)
}
},
},
"error close": {
ReadCloser: &mockReadCloser{
CloseFn: func() error {
return fmt.Errorf("foobar error")
},
},
CloseTest: func(t *testing.T, closer *safeReadCloser) {
t.Helper()
if err := closer.Close(); err == nil {
t.Error("expect close error, got nil")
} else if e, a := "foobar error", err.Error(); e != a {
t.Errorf("expect %v, got %v", e, a)
}
},
},
}
for name, tt := range cases {
t.Run(name, func(t *testing.T) {
sr := NewSafeReadCloser(tt.ReadCloser).(*safeReadCloser)
if e, a := false, sr.closed; e != a {
t.Errorf("expect %v, got %v", e, a)
}
if tt.ReadTest != nil {
tt.ReadTest(t, sr)
}
if tt.CloseTest != nil {
tt.CloseTest(t, sr)
} else {
sr.Close()
}
if e, a := true, sr.closed; e != a {
t.Errorf("expect %v, got %v", e, a)
}
if sr.readCloser != nil {
t.Errorf("expect reader to be nil after Close")
}
if err := sr.Close(); err != nil {
t.Errorf("expect subsequent Close returns to be nil, got %v", err)
}
})
}
}
func TestNewSafeReadCloser_WriteTo(t *testing.T) {
{
rc := &mockWriteTo{}
writeToReadCloser := NewSafeReadCloser(rc).(*safeWriteToReadCloser)
_, err := writeToReadCloser.WriteTo(nil)
if err != nil {
t.Errorf("expect no error, got %v", err)
}
err = writeToReadCloser.Close()
if err != nil {
t.Errorf("expect no error, got %v", err)
}
_, err = writeToReadCloser.WriteTo(nil)
if err != io.EOF {
t.Errorf("expect %T, got %T", io.EOF, err)
}
}
{
rc := &mockWriteTo{
WriteToFn: func(writer io.Writer) (int64, error) {
write, err := writer.Write([]byte("foo"))
return int64(write), err
},
}
writeToReadCloser := NewSafeReadCloser(rc).(*safeWriteToReadCloser)
var buf bytes.Buffer
_, err := writeToReadCloser.WriteTo(&buf)
if err != nil {
t.Errorf("expect no error, got %v", err)
}
if e, a := "foo", buf.String(); e != a {
t.Errorf("expect %v, got %v", e, a)
}
}
}
|
