kraken

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// Copyright (c) 2016-2019 Uber Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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//     http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rwutil
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import (
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	"testing"
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	"bytes"
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	"github.com/stretchr/testify/require"
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)
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func TestCappedBuffer_write_drain_success(t *testing.T) {
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	require := require.New(t)
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	content := []byte("hello this is a stream of bytes")
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	buffer := NewCappedBuffer(len(content))
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	buffer.WriteAt(content[7:], 7)
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	buffer.WriteAt(content[:7], 0)
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	var dst bytes.Buffer
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	buffer.DrainInto(&dst)
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	require.Equal(content, dst.Bytes())
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}
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func TestCappedBuffer_write_drain_error(t *testing.T) {
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	require := require.New(t)
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	content := []byte("hello this is a stream of bytes")
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	buffer := NewCappedBuffer(len(content) - 10)
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	_, err := buffer.WriteAt(content[7:], 7)
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	require.Error(err)
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	_, err = buffer.WriteAt(content[:7], 0)
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	require.NoError(err)
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}
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