github.com/lingyao2333/mo-zero@v1.4.1/core/filex/rangereader_test.go (about)

     1  package filex
     2  
     3  import (
     4  	"os"
     5  	"testing"
     6  
     7  	"github.com/lingyao2333/mo-zero/core/fs"
     8  	"github.com/stretchr/testify/assert"
     9  )
    10  
    11  func TestRangeReader(t *testing.T) {
    12  	const text = `hello
    13  world`
    14  	file, err := fs.TempFileWithText(text)
    15  	assert.Nil(t, err)
    16  	defer func() {
    17  		file.Close()
    18  		os.Remove(file.Name())
    19  	}()
    20  
    21  	reader := NewRangeReader(file, 5, 8)
    22  	buf := make([]byte, 10)
    23  	n, err := reader.Read(buf)
    24  	assert.Nil(t, err)
    25  	assert.Equal(t, 3, n)
    26  	assert.Equal(t, `
    27  wo`, string(buf[:n]))
    28  }
    29  
    30  func TestRangeReader_OutOfRange(t *testing.T) {
    31  	const text = `hello
    32  world`
    33  	file, err := fs.TempFileWithText(text)
    34  	assert.Nil(t, err)
    35  	defer func() {
    36  		file.Close()
    37  		os.Remove(file.Name())
    38  	}()
    39  
    40  	reader := NewRangeReader(file, 50, 8)
    41  	buf := make([]byte, 10)
    42  	_, err = reader.Read(buf)
    43  	assert.NotNil(t, err)
    44  }