fail();
    } catch (NullPointerException expected) {
    }
  }

  private static class StringHolder {
    @Nullable String string;
  }

  public void testBuilder_withMutableEntry() {
    ImmutableMultimap.Builder<String, Integer> builder = new Builder<>();
    final StringHolder holder = new StringHolder();
    holder.string = "one";
    Entry<String, Integer> entry =
        new AbstractMapEntry<String, Integer>() {

      fail();
    } catch (NullPointerException expected) {
    }
  }

  private static class StringHolder {
    @Nullable String string;
  }

  public void testBuilder_withMutableEntry() {
    ImmutableMultimap.Builder<String, Integer> builder = new Builder<>();
    final StringHolder holder = new StringHolder();
    holder.string = "one";
    Entry<String, Integer> entry =
        new AbstractMapEntry<String, Integer>() {

      // success
    }
  }

  private static class StringHolder {
    @Nullable String string;
  }

  public void testBuilder_withMutableCell() {
    ImmutableTable.Builder<Character, Integer, String> builder = new ImmutableTable.Builder<>();

    final StringHolder holder = new StringHolder();
    holder.string = "foo";
    Table.Cell<Character, Integer, String> mutableCell =

      fail();
    } catch (NullPointerException expected) {
    }
  }

  private static class StringHolder {
    @Nullable String string;
  }

  public void testBuilder_withMutableEntry() {
    ImmutableSetMultimap.Builder<String, Integer> builder = new Builder<>();
    final StringHolder holder = new StringHolder();
    holder.string = "one";
    Entry<String, Integer> entry =

    } catch (NullPointerException expected) {
    }
  }

  private static class StringHolder {
    @Nullable String string;
  }

  public void testBuilder_withMutableEntry() {
    ImmutableSortedMap.Builder<String, Integer> builder = ImmutableSortedMap.naturalOrder();
    final StringHolder holder = new StringHolder();
    holder.string = "one";
    Entry<String, Integer> entry =

      fail();
    } catch (NullPointerException expected) {
    }
  }

  private static class StringHolder {
    @Nullable String string;
  }

  public void testBuilder_withMutableEntry() {
    ImmutableListMultimap.Builder<String, Integer> builder = new Builder<>();
    final StringHolder holder = new StringHolder();
    holder.string = "one";
    Entry<String, Integer> entry =

      fail();
    } catch (NullPointerException expected) {
    }
  }

  private static class StringHolder {
    @Nullable String string;
  }

  public void testBuilder_withMutableEntry() {
    ImmutableSetMultimap.Builder<String, Integer> builder = new Builder<>();
    final StringHolder holder = new StringHolder();
    holder.string = "one";
    Entry<String, Integer> entry =

      fail();
    } catch (NullPointerException expected) {
    }
  }

  private static class StringHolder {
    @Nullable String string;
  }

  public void testBuilder_withMutableEntry() {
    ImmutableListMultimap.Builder<String, Integer> builder = new Builder<>();
    final StringHolder holder = new StringHolder();
    holder.string = "one";
    Entry<String, Integer> entry =

    } catch (NullPointerException expected) {
    }
  }

  private static class StringHolder {
    @Nullable String string;
  }

  public void testBuilder_withMutableEntry() {
    ImmutableSortedMap.Builder<String, Integer> builder = ImmutableSortedMap.naturalOrder();
    final StringHolder holder = new StringHolder();
    holder.string = "one";
    Entry<String, Integer> entry =

      // success
    }
  }

  private static class StringHolder {
    @Nullable String string;
  }

  public void testBuilder_withMutableCell() {
    ImmutableTable.Builder<Character, Integer, String> builder = new ImmutableTable.Builder<>();

    final StringHolder holder = new StringHolder();
    holder.string = "foo";
    Table.Cell<Character, Integer, String> mutableCell =