github.com/stffabi/git-lfs@v2.3.5-0.20180214015214-8eeaa8d88902+incompatible/git/pkt_line_writer_test.go (about)

     1  package git
     2  
     3  import (
     4  	"bytes"
     5  	"testing"
     6  
     7  	"github.com/stretchr/testify/assert"
     8  )
     9  
    10  func TestPktlineWriterWritesPacketsShorterThanMaxPacketSize(t *testing.T) {
    11  	var buf bytes.Buffer
    12  
    13  	w := NewPktlineWriter(&buf, 0)
    14  	assertWriterWrite(t, w, []byte("Hello, world!"), 13)
    15  	assertWriterWrite(t, w, nil, 0)
    16  
    17  	pl := newPktline(&buf, nil)
    18  	assertPacketRead(t, pl, []byte("Hello, world!"))
    19  	assertPacketRead(t, pl, nil)
    20  }
    21  
    22  func TestPktlineWriterWritesPacketsEqualToMaxPacketLength(t *testing.T) {
    23  	big := make([]byte, MaxPacketLength)
    24  	for i, _ := range big {
    25  		big[i] = 1
    26  	}
    27  
    28  	// Make a copy so that we can drain the data inside of it
    29  	p := make([]byte, MaxPacketLength)
    30  	copy(p, big)
    31  
    32  	var buf bytes.Buffer
    33  
    34  	w := NewPktlineWriter(&buf, 0)
    35  	assertWriterWrite(t, w, p, len(big))
    36  	assertWriterWrite(t, w, nil, 0)
    37  
    38  	pl := newPktline(&buf, nil)
    39  	assertPacketRead(t, pl, big)
    40  	assertPacketRead(t, pl, nil)
    41  }
    42  
    43  func TestPktlineWriterWritesMultiplePacketsLessThanMaxPacketLength(t *testing.T) {
    44  	var buf bytes.Buffer
    45  
    46  	w := NewPktlineWriter(&buf, 0)
    47  	assertWriterWrite(t, w, []byte("first\n"), len("first\n"))
    48  	assertWriterWrite(t, w, []byte("second"), len("second"))
    49  	assertWriterWrite(t, w, nil, 0)
    50  
    51  	pl := newPktline(&buf, nil)
    52  	assertPacketRead(t, pl, []byte("first\nsecond"))
    53  	assertPacketRead(t, pl, nil)
    54  }
    55  
    56  func TestPktlineWriterWritesMultiplePacketsGreaterThanMaxPacketLength(t *testing.T) {
    57  	var buf bytes.Buffer
    58  
    59  	b1 := make([]byte, MaxPacketLength*3/4)
    60  	for i, _ := range b1 {
    61  		b1[i] = 1
    62  	}
    63  
    64  	b2 := make([]byte, MaxPacketLength*3/4)
    65  	for i, _ := range b2 {
    66  		b2[i] = 2
    67  	}
    68  
    69  	w := NewPktlineWriter(&buf, 0)
    70  	assertWriterWrite(t, w, b1, len(b1))
    71  	assertWriterWrite(t, w, b2, len(b2))
    72  	assertWriterWrite(t, w, nil, 0)
    73  
    74  	// offs is how far into b2 we needed to buffer before writing an entire
    75  	// packet
    76  	offs := MaxPacketLength - len(b1)
    77  
    78  	pl := newPktline(&buf, nil)
    79  	assertPacketRead(t, pl, append(b1, b2[:offs]...))
    80  	assertPacketRead(t, pl, b2[offs:])
    81  	assertPacketRead(t, pl, nil)
    82  }
    83  
    84  func TestPktlineWriterAllowsFlushesOnNil(t *testing.T) {
    85  	assert.NoError(t, (*PktlineWriter)(nil).Flush())
    86  }
    87  
    88  func TestPktlineWriterDoesntWrapItself(t *testing.T) {
    89  	itself := &PktlineWriter{}
    90  	nw := NewPktlineWriter(itself, 0)
    91  
    92  	assert.Equal(t, itself, nw)
    93  }
    94  
    95  func assertWriterWrite(t *testing.T, w *PktlineWriter, p []byte, plen int) {
    96  	var n int
    97  	var err error
    98  
    99  	if p == nil {
   100  		err = w.Flush()
   101  	} else {
   102  		n, err = w.Write(p)
   103  	}
   104  
   105  	assert.Nil(t, err)
   106  	assert.Equal(t, plen, n)
   107  }
   108  
   109  func assertPacketRead(t *testing.T, pl *pktline, expected []byte) {
   110  	got, err := pl.readPacket()
   111  
   112  	assert.Nil(t, err)
   113  	assert.Equal(t, expected, got)
   114  }