writev_test.go

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package poll_test
     6  
     7  import (
     8  	"internal/poll"
     9  	"reflect"
    10  	"testing"
    11  )
    12  
    13  func TestConsume(t *testing.T) {
    14  	tests := []struct {
    15  		in      [][]byte
    16  		consume int64
    17  		want    [][]byte
    18  	}{
    19  		{
    20  			in:      [][]byte{[]byte("foo"), []byte("bar")},
    21  			consume: 0,
    22  			want:    [][]byte{[]byte("foo"), []byte("bar")},
    23  		},
    24  		{
    25  			in:      [][]byte{[]byte("foo"), []byte("bar")},
    26  			consume: 2,
    27  			want:    [][]byte{[]byte("o"), []byte("bar")},
    28  		},
    29  		{
    30  			in:      [][]byte{[]byte("foo"), []byte("bar")},
    31  			consume: 3,
    32  			want:    [][]byte{[]byte("bar")},
    33  		},
    34  		{
    35  			in:      [][]byte{[]byte("foo"), []byte("bar")},
    36  			consume: 4,
    37  			want:    [][]byte{[]byte("ar")},
    38  		},
    39  		{
    40  			in:      [][]byte{nil, nil, nil, []byte("bar")},
    41  			consume: 1,
    42  			want:    [][]byte{[]byte("ar")},
    43  		},
    44  		{
    45  			in:      [][]byte{nil, nil, nil, []byte("foo")},
    46  			consume: 0,
    47  			want:    [][]byte{[]byte("foo")},
    48  		},
    49  		{
    50  			in:      [][]byte{nil, nil, nil},
    51  			consume: 0,
    52  			want:    [][]byte{},
    53  		},
    54  	}
    55  	for i, tt := range tests {
    56  		in := tt.in
    57  		poll.Consume(&in, tt.consume)
    58  		if !reflect.DeepEqual(in, tt.want) {
    59  			t.Errorf("%d. after consume(%d) = %+v, want %+v", i, tt.consume, in, tt.want)
    60  		}
    61  	}
    62  }
    63
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