}

  @Test
  fun iterator() {
    set("a", "a1", "a2")
    set("b", "b1", "b2")
    set("c", "c1", "c2")
    val iterator = cache.snapshots()
    assertThat(iterator.hasNext()).isTrue()
    iterator.next().use {
      assertThat(it.key()).isEqualTo("a")
      it.assertValue(0, "a1")
      it.assertValue(1, "a2")
    }
    assertThat(iterator.hasNext()).isTrue()

        final LlmChatRequest request = new LlmChatRequest();
        client.testAddHistoryWithBudget(request, history, 10);
        // Q2 and A2 fit (4 chars), Q1 fits (6 chars), but A1 is too large and skipped
        // Pair integrity: Q1 without A1 => Q1 excluded
        // Result: Q2, A2
        assertEquals(2, request.getMessages().size());
        assertEquals("Q2", request.getMessages().get(0).getContent());

0000110 08 d1 1f 8f 5a 9e 96 ee 45 cf a4 84 4e 4b e8 50
0000120 a7 13 d9 06 de 52 81 97 36 b2 d7 b8 fc 2b 5f 55
0000130 23 1f 32 59 cf 30 27 fb e2 8a b9 de 45 dd 63 9c
0000140 4b b5 8b 96 4c 7a 62 62 cc a1 a7 cf fa f1 fe dd
0000150 54 62 11 bf 36 78 b3 c7 b1 b5 f2 61 4d 4e dd 66
0000160 32 2e e6 70 34 5f f4 c9 e6 6c 43 6f da 6b c6 c3
0000170 09 2c ce 09 57 7f d2 7e b4 23 ba 7c 1b 99 bc 22

   * guaranteed to return the same object again. For example:
   *
   * {@snippet :
   * PeekingIterator<String> peekingIterator =
   *     Iterators.peekingIterator(Iterators.forArray("a", "b"));
   * String a1 = peekingIterator.peek(); // returns "a"
   * String a2 = peekingIterator.peek(); // also returns "a"
   * String a3 = peekingIterator.next(); // also returns "a"
   * }
   *

   * guaranteed to return the same object again. For example:
   *
   * {@snippet :
   * PeekingIterator<String> peekingIterator =
   *     Iterators.peekingIterator(Iterators.forArray("a", "b"));
   * String a1 = peekingIterator.peek(); // returns "a"
   * String a2 = peekingIterator.peek(); // also returns "a"
   * String a3 = peekingIterator.next(); // also returns "a"
   * }
   *

   * Multimap<String, String> transformed = Multimaps.transformEntries(multimap, transformer);
   * System.out.println(transformed);
   * }
   *
   * ... prints {@code {"a"=["a1", "a4"], "b"=["b6"]}}.
   *
   * <p>Changes in the underlying multimap are reflected in this view. Conversely, this view
   * supports removal operations, and these are reflected in the underlying multimap.
   *

   * Multimap<String, String> transformed = Multimaps.transformEntries(multimap, transformer);
   * System.out.println(transformed);
   * }
   *
   * ... prints {@code {"a"=["a1", "a4"], "b"=["b6"]}}.
   *
   * <p>Changes in the underlying multimap are reflected in this view. Conversely, this view
   * supports removal operations, and these are reflected in the underlying multimap.
   *