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

     1  package odb
     2  
     3  import (
     4  	"bytes"
     5  	"errors"
     6  	"io/ioutil"
     7  	"strings"
     8  	"sync/atomic"
     9  	"testing"
    10  
    11  	"github.com/stretchr/testify/assert"
    12  )
    13  
    14  func TestBlobReturnsCorrectObjectType(t *testing.T) {
    15  	assert.Equal(t, BlobObjectType, new(Blob).Type())
    16  }
    17  
    18  func TestBlobFromString(t *testing.T) {
    19  	given := []byte("example")
    20  	glen := len(given)
    21  
    22  	b := NewBlobFromBytes(given)
    23  
    24  	assert.EqualValues(t, glen, b.Size)
    25  
    26  	contents, err := ioutil.ReadAll(b.Contents)
    27  	assert.NoError(t, err)
    28  	assert.Equal(t, given, contents)
    29  }
    30  
    31  func TestBlobEncoding(t *testing.T) {
    32  	const contents = "Hello, world!\n"
    33  
    34  	b := &Blob{
    35  		Size:     int64(len(contents)),
    36  		Contents: strings.NewReader(contents),
    37  	}
    38  
    39  	var buf bytes.Buffer
    40  	if _, err := b.Encode(&buf); err != nil {
    41  		t.Fatal(err.Error())
    42  	}
    43  	assert.Equal(t, contents, (&buf).String())
    44  }
    45  
    46  func TestBlobDecoding(t *testing.T) {
    47  	const contents = "Hello, world!\n"
    48  	from := strings.NewReader(contents)
    49  
    50  	b := new(Blob)
    51  	n, err := b.Decode(from, int64(len(contents)))
    52  
    53  	assert.Equal(t, 0, n)
    54  	assert.Nil(t, err)
    55  
    56  	assert.EqualValues(t, len(contents), b.Size)
    57  
    58  	got, err := ioutil.ReadAll(b.Contents)
    59  	assert.Nil(t, err)
    60  	assert.Equal(t, []byte(contents), got)
    61  }
    62  
    63  func TestBlobCallCloseFn(t *testing.T) {
    64  	var calls uint32
    65  
    66  	expected := errors.New("some close error")
    67  
    68  	b := &Blob{
    69  		closeFn: func() error {
    70  			atomic.AddUint32(&calls, 1)
    71  			return expected
    72  		},
    73  	}
    74  
    75  	got := b.Close()
    76  
    77  	assert.Equal(t, expected, got)
    78  	assert.EqualValues(t, 1, calls)
    79  }
    80  
    81  func TestBlobCanCloseWithoutCloseFn(t *testing.T) {
    82  	b := &Blob{
    83  		closeFn: nil,
    84  	}
    85  
    86  	assert.Nil(t, b.Close())
    87  }
    88  
    89  func TestBlobEqualReturnsTrueWithUnchangedContents(t *testing.T) {
    90  	c := strings.NewReader("Hello, world!")
    91  
    92  	b1 := &Blob{Size: int64(c.Len()), Contents: c}
    93  	b2 := &Blob{Size: int64(c.Len()), Contents: c}
    94  
    95  	assert.True(t, b1.Equal(b2))
    96  }
    97  
    98  func TestBlobEqualReturnsFalseWithChangedContents(t *testing.T) {
    99  	c1 := strings.NewReader("Hello, world!")
   100  	c2 := strings.NewReader("Goodbye, world!")
   101  
   102  	b1 := &Blob{Size: int64(c1.Len()), Contents: c1}
   103  	b2 := &Blob{Size: int64(c2.Len()), Contents: c2}
   104  
   105  	assert.False(t, b1.Equal(b2))
   106  }
   107  
   108  func TestBlobEqualReturnsTrueWhenOneBlobIsNil(t *testing.T) {
   109  	b1 := &Blob{Size: 1, Contents: bytes.NewReader([]byte{0xa})}
   110  	b2 := (*Blob)(nil)
   111  
   112  	assert.False(t, b1.Equal(b2))
   113  	assert.False(t, b2.Equal(b1))
   114  }
   115  
   116  func TestBlobEqualReturnsTrueWhenBothBlobsAreNil(t *testing.T) {
   117  	b1 := (*Blob)(nil)
   118  	b2 := (*Blob)(nil)
   119  
   120  	assert.True(t, b1.Equal(b2))
   121  }