} else {
            expected = range1.span(range2);
          }
        }

        try {
          assertEquals(expected, rangeMap.span());
          assertThat(expected).isNotNull();
        } catch (NoSuchElementException e) {
          assertThat(expected).isNull();
        }
      }
    }
  }

  public void testAllRangesAlone() {
    for (Range<Integer> range : RANGES) {

    } catch (RuntimeException e) {
      actualRuntimeException = e;
    }

    assertEquals(expectedResult, actualResult);
    if (expectedRuntimeException != null) {
      assertThat(actualRuntimeException).isNotNull();
      assertEquals(expectedRuntimeException.getClass(), actualRuntimeException.getClass());
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester

    }

    void check() {
      runTester();
      NullRejectingFromTo<?, ?> defaultFunction =
          (NullRejectingFromTo<?, ?>) getDefaultParameterValue(0);
      assertThat(defaultFunction).isNotNull();
      try {
        defaultFunction.apply(null);
        fail("Proxy Should have rejected null");
      } catch (NullPointerException expected) {
      }
    }
  }

    map.put(0, 1);
    map.put(1, 1);
    map.put(2, 1);
    map.entrySet()
        .removeIf(
            entry -> {
              assertThat(entry.getValue()).isNotNull();
              map.remove((entry.getKey() + 1) % 3);
              return false;
            });
    assertThat(map).hasSize(1);
  }