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// Copyright 2020 NLP Odyssey 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 pytorch
import (
"bytes"
"io"
"testing"
)
func TestLimitedBufferReader(t *testing.T) {
t.Run("empty input, data size 0", func(t *testing.T) {
r := bytes.NewReader([]byte{})
br := NewLimitedBufferReader(r, 0, 2, 3)
assertNotHasNext(t, br)
assertReadNextEof(t, br)
})
t.Run("empty input, data size > 0", func(t *testing.T) {
r := bytes.NewReader([]byte{})
br := NewLimitedBufferReader(r, 10, 2, 3)
assertHasNext(t, br)
assertReadNextEof(t, br)
})
t.Run("data size = scalar * buffer", func(t *testing.T) {
input := []byte{11, 12, 21, 22, 31, 32, 41, 42, 51, 52, 61, 62}
r := bytes.NewReader(input)
br := NewLimitedBufferReader(r, 6, 2, 3)
assertReadNextValue(t, br, []byte{11, 12})
assertReadNextValue(t, br, []byte{21, 22})
assertReadNextValue(t, br, []byte{31, 32})
assertReadNextValue(t, br, []byte{41, 42})
assertReadNextValue(t, br, []byte{51, 52})
assertReadNextValue(t, br, []byte{61, 62})
assertNotHasNext(t, br)
assertReadNextEof(t, br)
})
t.Run("data size > scalar * buffer", func(t *testing.T) {
input := []byte{11, 12, 21, 22, 31, 32, 41, 42, 51, 52, 61, 62, 71, 72}
r := bytes.NewReader(input)
br := NewLimitedBufferReader(r, 7, 2, 3)
assertReadNextValue(t, br, []byte{11, 12})
assertReadNextValue(t, br, []byte{21, 22})
assertReadNextValue(t, br, []byte{31, 32})
assertReadNextValue(t, br, []byte{41, 42})
assertReadNextValue(t, br, []byte{51, 52})
assertReadNextValue(t, br, []byte{61, 62})
assertReadNextValue(t, br, []byte{71, 72})
assertNotHasNext(t, br)
assertReadNextEof(t, br)
})
t.Run("data size < scalar * buffer", func(t *testing.T) {
input := []byte{11, 12, 21, 22, 31, 32, 41, 42, 51, 52}
r := bytes.NewReader(input)
br := NewLimitedBufferReader(r, 5, 2, 3)
assertReadNextValue(t, br, []byte{11, 12})
assertReadNextValue(t, br, []byte{21, 22})
assertReadNextValue(t, br, []byte{31, 32})
assertReadNextValue(t, br, []byte{41, 42})
assertReadNextValue(t, br, []byte{51, 52})
assertNotHasNext(t, br)
assertReadNextEof(t, br)
})
t.Run("remaining data in buffer", func(t *testing.T) {
input := []byte{11, 12, 21, 22, 31, 32, 41, 42, 51, 52, 90, 91, 92}
r := bytes.NewReader(input)
br := NewLimitedBufferReader(r, 5, 2, 3)
assertReadNextValue(t, br, []byte{11, 12})
assertReadNextValue(t, br, []byte{21, 22})
assertReadNextValue(t, br, []byte{31, 32})
assertReadNextValue(t, br, []byte{41, 42})
assertReadNextValue(t, br, []byte{51, 52})
assertNotHasNext(t, br)
assertReadNextEof(t, br)
rest := make([]byte, 3)
n, err := r.Read(rest)
if n != 3 || err != nil {
t.Errorf("expected 3 bytes and no error, got %d and %#v", n, err)
}
assertByteSliceEqual(t, rest, []byte{90, 91, 92})
})
}
func assertHasNext(t *testing.T, br *LimitedBufferReader) {
if !br.HasNext() {
t.Errorf("expected HasNext() true, but it is false")
}
}
func assertNotHasNext(t *testing.T, br *LimitedBufferReader) {
if br.HasNext() {
t.Errorf("expected HasNext() false, but it is true")
}
}
func assertReadNextValue(t *testing.T, br *LimitedBufferReader, val []byte) {
assertHasNext(t, br)
result, err := br.ReadNext()
if err != nil {
t.Errorf("expected nil error, actual %#v", err)
}
assertByteSliceEqual(t, result, val)
}
func assertByteSliceEqual(t *testing.T, actual, expected []byte) {
if len(expected) != len(actual) {
t.Errorf("expected %#v, actual %#v", expected, actual)
return
}
for index, expected := range expected {
actual := actual[index]
if expected != actual {
t.Errorf("expected %#v, actual %#v", expected, actual)
return
}
}
}
func assertReadNextEof(t *testing.T, br *LimitedBufferReader) {
result, err := br.ReadNext()
if result != nil {
t.Errorf("expected nil result, actual %#v", result)
}
if err != io.EOF {
t.Errorf("expected EOF error, actual %#v", err)
}
}
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