wehub-resource-sync
108 lines
3.2 KiB
Go
108 lines
3.2 KiB
Go
// Copyright 2024 Dolthub, 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 _dataloader
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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/dolthub/doltgresql/core/dataloader"
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"github.com/stretchr/testify/require"
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)
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func TestStringPrefixReader(t *testing.T) {
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t.Run("Read prefix and all data in single call", func(t *testing.T) {
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prefix := "prefix"
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reader := bytes.NewReader([]byte("0123456789"))
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prefixReader := dataloader.NewStringPrefixReader(prefix, reader)
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data := make([]byte, 100)
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bytesRead, err := prefixReader.Read(data)
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require.NoError(t, err)
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require.Equal(t, 16, bytesRead)
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require.Equal(t, "prefix0123456789", string(data[:bytesRead]))
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bytesRead, err = prefixReader.Read(data)
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require.Equal(t, io.EOF, err)
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require.Equal(t, 0, bytesRead)
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})
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t.Run("Read part of prefix", func(t *testing.T) {
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prefix := "prefix"
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reader := bytes.NewReader([]byte("0123456789"))
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prefixReader := dataloader.NewStringPrefixReader(prefix, reader)
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data := make([]byte, 5)
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bytesRead, err := prefixReader.Read(data)
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require.NoError(t, err)
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require.Equal(t, 5, bytesRead)
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require.Equal(t, "prefi", string(data[:bytesRead]))
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// Read the next 5 bytes
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bytesRead, err = prefixReader.Read(data)
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require.NoError(t, err)
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require.Equal(t, 5, bytesRead)
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require.Equal(t, "x0123", string(data[:bytesRead]))
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// Read the next 5 bytes
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bytesRead, err = prefixReader.Read(data)
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require.NoError(t, err)
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require.Equal(t, 5, bytesRead)
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require.Equal(t, "45678", string(data[:bytesRead]))
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// Read the last byte
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bytesRead, err = prefixReader.Read(data)
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require.NoError(t, err)
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require.Equal(t, 1, bytesRead)
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require.Equal(t, "9", string(data[:bytesRead]))
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// Read EOF
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bytesRead, err = prefixReader.Read(data)
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require.Equal(t, io.EOF, err)
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require.Equal(t, 0, bytesRead)
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})
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t.Run("Read to prefix boundary", func(t *testing.T) {
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prefix := "prefix"
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reader := bytes.NewReader([]byte("0123456789"))
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prefixReader := dataloader.NewStringPrefixReader(prefix, reader)
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data := make([]byte, 6)
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bytesRead, err := prefixReader.Read(data)
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require.NoError(t, err)
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require.Equal(t, 6, bytesRead)
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require.Equal(t, "prefix", string(data[:bytesRead]))
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// Read the next 6 bytes
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bytesRead, err = prefixReader.Read(data)
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require.NoError(t, err)
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require.Equal(t, 6, bytesRead)
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require.Equal(t, "012345", string(data[:bytesRead]))
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// Read the next 6 bytes
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bytesRead, err = prefixReader.Read(data)
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require.NoError(t, err)
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require.Equal(t, 4, bytesRead)
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require.Equal(t, "6789", string(data[:bytesRead]))
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// Read EOF
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bytesRead, err = prefixReader.Read(data)
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require.Equal(t, io.EOF, err)
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require.Equal(t, 0, bytesRead)
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})
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}
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