}
			seen[k] = true
			return true
		})

		if len(seen) != mapSize {
			t.Fatalf("Range visited %v elements of %v-element Map", len(seen), mapSize)
		}
	}
}

func TestIssue40999(t *testing.T) {
	var m sync.Map

	// Since the miss-counting in missLocked (via Delete)
	// compares the miss count with len(m.dirty),
	// add an initial entry to bias len(m.dirty) above the miss count.