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// Copyright 2022 The Go 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 saferio
import (
"bytes"
"io"
"testing"
)
func TestReadData(t *testing.T) {
const count = 100
input := bytes.Repeat([]byte{'a'}, count)
t.Run("small", func(t *testing.T) {
got, err := ReadData(bytes.NewReader(input), count)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(got, input) {
t.Errorf("got %v, want %v", got, input)
}
})
t.Run("large", func(t *testing.T) {
_, err := ReadData(bytes.NewReader(input), 10<<30)
if err == nil {
t.Error("large read succeeded unexpectedly")
}
})
t.Run("maxint", func(t *testing.T) {
_, err := ReadData(bytes.NewReader(input), 1<<62)
if err == nil {
t.Error("large read succeeded unexpectedly")
}
})
t.Run("small-EOF", func(t *testing.T) {
_, err := ReadData(bytes.NewReader(nil), chunk-1)
if err != io.EOF {
t.Errorf("ReadData = %v, want io.EOF", err)
}
})
t.Run("large-EOF", func(t *testing.T) {
_, err := ReadData(bytes.NewReader(nil), chunk+1)
if err != io.EOF {
t.Errorf("ReadData = %v, want io.EOF", err)
}
})
t.Run("large-UnexpectedEOF", func(t *testing.T) {
_, err := ReadData(bytes.NewReader(make([]byte, chunk)), chunk+1)
if err != io.ErrUnexpectedEOF {
t.Errorf("ReadData = %v, want io.ErrUnexpectedEOF", err)
}
})
}
func TestReadDataAt(t *testing.T) {
const count = 100
input := bytes.Repeat([]byte{'a'}, count)
t.Run("small", func(t *testing.T) {
got, err := ReadDataAt(bytes.NewReader(input), count, 0)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(got, input) {
t.Errorf("got %v, want %v", got, input)
}
})
t.Run("large", func(t *testing.T) {
_, err := ReadDataAt(bytes.NewReader(input), 10<<30, 0)
if err == nil {
t.Error("large read succeeded unexpectedly")
}
})
t.Run("maxint", func(t *testing.T) {
_, err := ReadDataAt(bytes.NewReader(input), 1<<62, 0)
if err == nil {
t.Error("large read succeeded unexpectedly")
}
})
t.Run("SectionReader", func(t *testing.T) {
// Reading 0 bytes from an io.SectionReader at the end
// of the section will return EOF, but ReadDataAt
// should succeed and return 0 bytes.
sr := io.NewSectionReader(bytes.NewReader(input), 0, 0)
got, err := ReadDataAt(sr, 0, 0)
if err != nil {
t.Fatal(err)
}
if len(got) > 0 {
t.Errorf("got %d bytes, expected 0", len(got))
}
})
}
func TestSliceCap(t *testing.T) {
t.Run("small", func(t *testing.T) {
c := SliceCap((*int)(nil), 10)
if c != 10 {
t.Errorf("got capacity %d, want %d", c, 10)
}
})
t.Run("large", func(t *testing.T) {
c := SliceCap((*byte)(nil), 1<<30)
if c < 0 {
t.Error("SliceCap failed unexpectedly")
} else if c == 1<<30 {
t.Errorf("got capacity %d which is too high", c)
}
})
t.Run("maxint", func(t *testing.T) {
c := SliceCap((*byte)(nil), 1<<63)
if c >= 0 {
t.Errorf("SliceCap returned %d, expected failure", c)
}
})
t.Run("overflow", func(t *testing.T) {
c := SliceCap((*int64)(nil), 1<<62)
if c >= 0 {
t.Errorf("SliceCap returned %d, expected failure", c)
}
})
}
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