github.com/rclone/rclone@v1.66.1-0.20240517100346-7b89735ae726/vfs/vfstest/read.go (about)

     1  package vfstest
     2  
     3  import (
     4  	"io"
     5  	"testing"
     6  
     7  	"github.com/stretchr/testify/assert"
     8  )
     9  
    10  // TestReadByByte reads by byte including don't read any bytes
    11  func TestReadByByte(t *testing.T) {
    12  	run.skipIfNoFUSE(t)
    13  
    14  	var data = []byte("hellohello")
    15  	run.createFile(t, "testfile", string(data))
    16  	run.checkDir(t, "testfile 10")
    17  
    18  	for i := 0; i < len(data); i++ {
    19  		fd, err := run.os.Open(run.path("testfile"))
    20  		assert.NoError(t, err)
    21  		for j := 0; j < i; j++ {
    22  			buf := make([]byte, 1)
    23  			n, err := io.ReadFull(fd, buf)
    24  			assert.NoError(t, err)
    25  			assert.Equal(t, 1, n)
    26  			assert.Equal(t, buf[0], data[j])
    27  		}
    28  		err = fd.Close()
    29  		assert.NoError(t, err)
    30  	}
    31  
    32  	run.rm(t, "testfile")
    33  }
    34  
    35  // TestReadChecksum checks the checksum reading is working
    36  func TestReadChecksum(t *testing.T) {
    37  	run.skipIfNoFUSE(t)
    38  
    39  	// create file big enough so we exceed any single FUSE read
    40  	// request
    41  	b := make([]rune, 3*128*1024)
    42  	for i := range b {
    43  		b[i] = 'r'
    44  	}
    45  	run.createFile(t, "bigfile", string(b))
    46  
    47  	// The hash comparison would fail in Flush, if we did not
    48  	// ensure we read the whole file
    49  	fd, err := run.os.Open(run.path("bigfile"))
    50  	assert.NoError(t, err)
    51  	buf := make([]byte, 10)
    52  	_, err = io.ReadFull(fd, buf)
    53  	assert.NoError(t, err)
    54  	err = fd.Close()
    55  	assert.NoError(t, err)
    56  
    57  	// The hash comparison would fail, because we only read parts
    58  	// of the file
    59  	fd, err = run.os.Open(run.path("bigfile"))
    60  	assert.NoError(t, err)
    61  	// read at start
    62  	_, err = io.ReadFull(fd, buf)
    63  	assert.NoError(t, err)
    64  	// read at end
    65  	_, err = fd.Seek(int64(len(b)-len(buf)), io.SeekStart)
    66  	assert.NoError(t, err)
    67  	_, err = io.ReadFull(fd, buf)
    68  	assert.NoError(t, err)
    69  	// ensure we don't compare hashes
    70  	err = fd.Close()
    71  	assert.NoError(t, err)
    72  
    73  	run.rm(t, "bigfile")
    74  }
    75  
    76  // TestReadSeek test seeking
    77  func TestReadSeek(t *testing.T) {
    78  	run.skipIfNoFUSE(t)
    79  
    80  	var data = []byte("helloHELLO")
    81  	run.createFile(t, "testfile", string(data))
    82  	run.checkDir(t, "testfile 10")
    83  
    84  	fd, err := run.os.Open(run.path("testfile"))
    85  	assert.NoError(t, err)
    86  
    87  	// Seek to half way
    88  	_, err = fd.Seek(5, io.SeekStart)
    89  	assert.NoError(t, err)
    90  
    91  	buf, err := io.ReadAll(fd)
    92  	assert.NoError(t, err)
    93  	assert.Equal(t, buf, []byte("HELLO"))
    94  
    95  	// Test seeking to the end
    96  	_, err = fd.Seek(10, io.SeekStart)
    97  	assert.NoError(t, err)
    98  
    99  	buf, err = io.ReadAll(fd)
   100  	assert.NoError(t, err)
   101  	assert.Equal(t, buf, []byte(""))
   102  
   103  	// Test seeking beyond the end
   104  	_, err = fd.Seek(1000000, io.SeekStart)
   105  	assert.NoError(t, err)
   106  
   107  	buf, err = io.ReadAll(fd)
   108  	assert.NoError(t, err)
   109  	assert.Equal(t, buf, []byte(""))
   110  
   111  	// Now back to the start
   112  	_, err = fd.Seek(0, io.SeekStart)
   113  	assert.NoError(t, err)
   114  
   115  	buf, err = io.ReadAll(fd)
   116  	assert.NoError(t, err)
   117  	assert.Equal(t, buf, []byte("helloHELLO"))
   118  
   119  	err = fd.Close()
   120  	assert.NoError(t, err)
   121  
   122  	run.rm(t, "testfile")
   123  }