ringbuf_test.go

package freecache

import (
	"testing"
)

func TestRingBuf(t *testing.T) {
	rb := NewRingBuf(16, 0)
	for i := 0; i < 2; i++ {
		rb.Write([]byte("fghibbbbccccddde"))
		rb.Write([]byte("fghibbbbc"))
		rb.Resize(16)
		off := rb.Evacuate(9, 3)
		t.Log(string(rb.Dump()))
		if off != rb.End()-3 {
			t.Log(string(rb.Dump()), rb.End())
			t.Fatalf("off got %v", off)
		}
		off = rb.Evacuate(15, 5)
		t.Log(string(rb.Dump()))
		if off != rb.End()-5 {
			t.Fatalf("off got %v", off)
		}
		rb.Resize(64)
		rb.Resize(32)
		data := make([]byte, 5)
		rb.ReadAt(data, off)
		if string(data) != "efghi" {
			t.Fatalf("read at should be efghi, got %v", string(data))
		}

		off = rb.Evacuate(0, 10)
		if off != -1 {
			t.Fatal("evacutate out of range offset should return error")
		}

		/* -- After reset the buffer should behave exactly the same as a new one.
		 *    Hence, run the test once more again with reset buffer. */
		rb.Reset(0)
	}
}