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package page_writer
import (
"github.com/stretchr/testify/assert"
"os"
"testing"
)
func TestChunkedFileWriter_toActualOffset(t *testing.T) {
cw := NewChunkedFileWriter("", 16)
writeToFile(cw, 50, 60)
writeToFile(cw, 60, 64)
writeToFile(cw, 32, 40)
writeToFile(cw, 42, 48)
writeToFile(cw, 48, 50)
assert.Equal(t, 1, cw.chunkUsages[0].size(), "fully covered")
assert.Equal(t, 2, cw.chunkUsages[1].size(), "2 intervals")
}
func writeToFile(cw *ChunkedFileWriter, startOffset int64, stopOffset int64) {
_, chunkUsage := cw.toActualWriteOffset(startOffset)
// skip doing actual writing
innerOffset := startOffset % cw.ChunkSize
chunkUsage.MarkWritten(innerOffset, innerOffset+stopOffset-startOffset)
}
func TestWriteChunkedFile(t *testing.T) {
x := NewChunkedFileWriter(os.TempDir(), 20)
defer x.Destroy()
y := NewChunkedFileWriter(os.TempDir(), 12)
defer y.Destroy()
batchSize := 4
buf := make([]byte, batchSize)
for i := 0; i < 256; i++ {
for x := 0; x < batchSize; x++ {
buf[x] = byte(i)
}
x.WriteAt(buf, int64(i*batchSize))
y.WriteAt(buf, int64((255-i)*batchSize))
}
a := make([]byte, 1)
b := make([]byte, 1)
for i := 0; i < 256*batchSize; i++ {
x.ReadDataAt(a, int64(i))
y.ReadDataAt(b, int64(256*batchSize-1-i))
assert.Equal(t, a[0], b[0], "same read")
}
}