afterScav := map[ChunkIdx][]BitRange{
			BaseChunkIdx: bits64ToBitRanges(scav, base),
		}
		want := NewPageAlloc(afterAlloc, afterScav)
		defer FreePageAlloc(want)

		// Check to see if it worked.
		checkPageAlloc(t, want, b)
	}

	// Empty.
	runTest(t, 0, 0, 0)

	// Full.
	runTest(t, 0, ^uint64(0), ^uint64(0))

	// Random.
	for i := 0; i < 100; i++ {
		// Generate random valid base within a chunk.

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime_test

import (
	"fmt"
	"internal/goos"
	. "runtime"
	"testing"
)

func checkPageAlloc(t *testing.T, want, got *PageAlloc) {
	// Ensure start and end are correct.
	wantStart, wantEnd := want.Bounds()
	gotStart, gotEnd := got.Bounds()
	if gotStart != wantStart {

					t.Fatalf("bad scavenge #%d: want %d, got %d", iter+1, h.expect, got)
				}
			}
			want := NewPageAlloc(v.beforeAlloc, v.afterScav)
			defer FreePageAlloc(want)

			checkPageAlloc(t, want, b)
		})
	}
}

func TestScavenger(t *testing.T) {
	// workedTime is a standard conversion of bytes of scavenge
	// work to time elapsed.
	workedTime := func(bytes uintptr) int64 {