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package bytewriter
import (
"os"
"path/filepath"
"testing"
)
func TestMemoryMappedWriter(t *testing.T) {
filename := "bytebuffer_memorymappedwriter_test.tmp"
loc := filepath.Join(os.TempDir(), filename)
if _, err := os.Stat(loc); err == nil {
err = os.Remove(loc)
if err != nil {
t.Fatal("Cannot proceed with test as cannot remove spec file")
}
}
w, err := NewMemoryMappedWriter(loc, 10)
if err != nil {
t.Fatal("Cannot proceed with test as create writer failed:", err)
}
if _, err = os.Stat(loc); err != nil {
t.Fatalf("No File created at %v despite the Buffer being initialized", loc)
}
_, err = w.WriteString("x", 5)
if err != nil {
t.Fatal("Cannot Write to MemoryMappedWriter")
}
reader, err := os.Open(loc)
if err != nil {
t.Fatal("Cannot open memory mapped file")
}
data := make([]byte, 10)
_, err = reader.Read(data)
if err != nil {
t.Fatal("Cannot read data from memory mapped file")
}
if data[5] != 'x' {
t.Error("Data Written in buffer not getting reflected in file")
}
if err = reader.Close(); err != nil {
t.Error("Cannot close file reader")
}
testUnmap(w, loc, t)
}
func testUnmap(w *MemoryMappedWriter, loc string, t *testing.T) {
if err := w.Unmap(true); err != nil {
t.Error(err)
}
if _, err := os.Stat(loc); err == nil {
t.Error("Memory Mapped File not getting deleted on Unmap")
}
}
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