83 lines
2.2 KiB
Go
83 lines
2.2 KiB
Go
// Copyright 2023 PingCAP, 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 prefetch
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import (
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"bytes"
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"io"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestBasic(t *testing.T) {
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source := bytes.NewReader([]byte("01234567890"))
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r := NewReader(io.NopCloser(source), 3)
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buf := make([]byte, 1)
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n, err := r.Read(buf)
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require.NoError(t, err)
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require.EqualValues(t, 1, n)
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require.EqualValues(t, "0", buf[:n])
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buf = make([]byte, 2)
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n, err = r.Read(buf)
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require.NoError(t, err)
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require.EqualValues(t, 2, n)
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require.EqualValues(t, "12", buf[:n])
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buf = make([]byte, 3)
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n, err = r.Read(buf)
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require.NoError(t, err)
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require.EqualValues(t, 3, n)
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require.EqualValues(t, "345", buf[:n])
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buf = make([]byte, 4)
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n, err = r.Read(buf)
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require.NoError(t, err)
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require.EqualValues(t, 4, n)
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require.EqualValues(t, "6789", buf[:n])
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n, err = r.Read(buf)
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require.NoError(t, err)
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require.EqualValues(t, 1, n)
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require.EqualValues(t, "0", buf[:n])
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_, err = r.Read(buf)
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require.ErrorIs(t, err, io.EOF)
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source = bytes.NewReader([]byte("01234567890"))
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r = NewReader(io.NopCloser(source), 3)
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buf = make([]byte, 11)
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n, err = r.Read(buf)
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require.NoError(t, err)
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require.EqualValues(t, 11, n)
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_, err = r.Read(buf)
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require.ErrorIs(t, err, io.EOF)
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source = bytes.NewReader([]byte("01234"))
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r = NewReader(io.NopCloser(source), 100)
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buf = make([]byte, 11)
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n, err = r.Read(buf)
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require.NoError(t, err)
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require.EqualValues(t, 5, n)
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_, err = r.Read(buf)
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require.ErrorIs(t, err, io.EOF)
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}
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func TestCloseBeforeDrainRead(t *testing.T) {
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data := make([]byte, 1024)
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r := NewReader(io.NopCloser(bytes.NewReader(data)), 2)
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err := r.Close()
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require.NoError(t, err)
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}
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