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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package diskio
import (
"bytes"
"io"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestMeteredReader(t *testing.T) {
data := make([]byte, 128)
t.Run("happy path - with callback", func(t *testing.T) {
var (
read int64
took int64
)
cb := func(r int64, n int64) {
read = r
took = n
}
mr := NewMeteredReader(bytes.NewReader(data), cb)
target := make([]byte, 128)
n, err := mr.Read(target)
require.Nil(t, err)
assert.Equal(t, int64(n), read)
assert.Greater(t, took, int64(0))
})
t.Run("happy path - without callback", func(t *testing.T) {
mr := NewMeteredReader(bytes.NewReader(data), nil)
target := make([]byte, 128)
_, err := mr.Read(target)
require.Nil(t, err)
})
t.Run("with an error", func(t *testing.T) {
var (
read int64
took int64
)
cb := func(r int64, n int64) {
read = r
took = n
}
underlying := bytes.NewReader(data)
// provoke EOF error by seeking to end of data
underlying.Seek(128, 0)
mr := NewMeteredReader(underlying, cb)
target := make([]byte, 128)
_, err := mr.Read(target)
assert.Equal(t, io.EOF, err)
// callback should not have been called in error cases, so we expect to
// read initial values
assert.Equal(t, int64(0), read)
assert.Equal(t, int64(0), took)
})
}
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