}
	item, err = h.Pop()
	if e, a := 30, item.(testHeapObject).val; err != nil || a != e {
		t.Fatalf("expected %d, got %d", e, a)
	}
}

// TestHeap_Delete tests Heap.Delete and ensures that heap invariant is
// preserved after deleting items.
func TestHeap_Delete(t *testing.T) {
	h := New(testHeapObjectKeyFunc, compareInts)
	h.Add(mkHeapObj("foo", 10))
	h.Add(mkHeapObj("bar", 1))
	h.Add(mkHeapObj("bal", 31))