github.com/uber/kraken@v0.1.4/utils/rwutil/cappedbuffer_test.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package rwutil
    15  
    16  import (
    17  	"testing"
    18  
    19  	"bytes"
    20  
    21  	"github.com/stretchr/testify/require"
    22  )
    23  
    24  func TestCappedBuffer_write_drain_success(t *testing.T) {
    25  	require := require.New(t)
    26  
    27  	content := []byte("hello this is a stream of bytes")
    28  	buffer := NewCappedBuffer(len(content))
    29  	buffer.WriteAt(content[7:], 7)
    30  	buffer.WriteAt(content[:7], 0)
    31  
    32  	var dst bytes.Buffer
    33  	buffer.DrainInto(&dst)
    34  	require.Equal(content, dst.Bytes())
    35  }
    36  
    37  func TestCappedBuffer_write_drain_error(t *testing.T) {
    38  	require := require.New(t)
    39  
    40  	content := []byte("hello this is a stream of bytes")
    41  	buffer := NewCappedBuffer(len(content) - 10)
    42  	_, err := buffer.WriteAt(content[7:], 7)
    43  	require.Error(err)
    44  
    45  	_, err = buffer.WriteAt(content[:7], 0)
    46  	require.NoError(err)
    47  }