try {
      builder.addAll((Iterable<String>) iterableWithNulls);
      fail("expected NullPointerException"); // COV_NF_LINE
    } catch (NullPointerException expected) {
    }
  }

  /**
   * Verify thread safety by using a collection whose size() may be inconsistent with the actual
   * number of elements and whose elements may change over time.
   *

    try {
      builder.addAll((Iterable<String>) iterableWithNulls);
      fail("expected NullPointerException"); // COV_NF_LINE
    } catch (NullPointerException expected) {
    }
  }

  /**
   * Verify thread safety by using a collection whose size() may be inconsistent with the actual
   * number of elements and whose elements may change over time.
   *