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// Copyright 2018 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package uio
import (
"bytes"
"errors"
"fmt"
"io"
"strings"
"testing"
)
type mockReader struct {
// called is whether Read has been called.
called bool
// err is the error to return on Read.
err error
}
func (m *mockReader) Read([]byte) (int, error) {
m.called = true
return 0, m.err
}
func (m *mockReader) ReadAt([]byte, int64) (int, error) {
m.called = true
return 0, m.err
}
func TestLazyOpenerRead(t *testing.T) {
for i, tt := range []struct {
openErr error
reader *mockReader
wantCalled bool
}{
{
openErr: nil,
reader: &mockReader{},
wantCalled: true,
},
{
openErr: io.EOF,
reader: nil,
wantCalled: false,
},
{
openErr: nil,
reader: &mockReader{
err: io.ErrUnexpectedEOF,
},
wantCalled: true,
},
} {
t.Run(fmt.Sprintf("Test #%02d", i), func(t *testing.T) {
var opened bool
lr := NewLazyOpener("testname", func() (io.Reader, error) {
opened = true
return tt.reader, tt.openErr
})
_, err := lr.Read([]byte{})
if !opened {
t.Fatalf("Read(): Reader was not opened")
}
if tt.openErr != nil && err != tt.openErr {
t.Errorf("Read() = %v, want %v", err, tt.openErr)
}
if tt.reader != nil {
if got, want := tt.reader.called, tt.wantCalled; got != want {
t.Errorf("mockReader.Read() called is %v, want %v", got, want)
}
if tt.reader.err != nil && err != tt.reader.err {
t.Errorf("Read() = %v, want %v", err, tt.reader.err)
}
}
})
}
}
func TestLazyOpenerReadAt(t *testing.T) {
for i, tt := range []struct {
limit int64
bufSize int
openErr error
reader io.ReaderAt
off int64
want error
wantB []byte
}{
{
limit: -1,
bufSize: 10,
openErr: nil,
reader: &mockReader{},
},
{
limit: -1,
bufSize: 10,
openErr: io.EOF,
reader: nil,
want: io.EOF,
},
{
limit: -1,
bufSize: 10,
openErr: nil,
reader: &mockReader{
err: io.ErrUnexpectedEOF,
},
want: io.ErrUnexpectedEOF,
},
{
limit: -1,
bufSize: 6,
reader: strings.NewReader("foobar"),
wantB: []byte("foobar"),
},
{
limit: -1,
off: 3,
bufSize: 3,
reader: strings.NewReader("foobar"),
wantB: []byte("bar"),
},
{
limit: 5,
off: 3,
bufSize: 3,
reader: strings.NewReader("foobar"),
wantB: []byte("ba"),
},
{
limit: 2,
bufSize: 2,
reader: strings.NewReader("foobar"),
wantB: []byte("fo"),
},
{
limit: 2,
off: 2,
reader: strings.NewReader("foobar"),
want: io.EOF,
},
} {
t.Run(fmt.Sprintf("Test #%02d", i), func(t *testing.T) {
var opened bool
lr := NewLazyLimitOpenerAt("", tt.limit, func() (io.ReaderAt, error) {
opened = true
return tt.reader, tt.openErr
})
b := make([]byte, tt.bufSize)
n, err := lr.ReadAt(b, tt.off)
if !opened {
t.Fatalf("Read(): Reader was not opened")
}
if !errors.Is(tt.want, err) {
t.Errorf("Read() = %v, want %v", err, tt.want)
}
if err == nil {
if !bytes.Equal(b[:n], tt.wantB) {
t.Errorf("Read() = %s, want %s", b[:n], tt.wantB)
}
}
})
}
}
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