* @param a
     *            first array
     * @param b
     *            second array
     * @return the concatenated result array
     */
    public static <T> T[] addAll(final T[] a, final T[] b) {
        if (a == null) {
            return b;
        }
        if (b == null) {
            return a;
        }
        if (a.length == 0) {
            return b;

    StatsAccumulator accumulator = new StatsAccumulator();
    accumulator.addAll(MANY_VALUES);
    Stats stats = accumulator.snapshot();
    accumulator.add(999.999); // should do nothing to the snapshot
    return stats;
  }

  private static Stats buildLongManyValuesStatsSnapshot() {
    StatsAccumulator accumulator = new StatsAccumulator();
    accumulator.addAll(LONG_MANY_VALUES);
    return accumulator.snapshot();
  }

    for (K k : sampleKeys()) {
      resetContainer();

      List<V> expectedValues = copyToList(multimap().get(k));

      assertTrue(multimap().putAll(k, values));
      expectedValues.addAll(values);

      assertGet(k, expectedValues);
    }
  }

    for (K k : sampleKeys()) {
      resetContainer();

      Set<V> expectedValues = copyToSet(multimap().get(k));

      multimap().putAll(k, valuesToPut);
      expectedValues.addAll(valuesToPut);

      assertGet(k, expectedValues);
    }
  }

      @Override
      protected Multiset<String> create(String[] elements) {
        Multiset<String> multiset = LinkedHashMultiset.create();
        Collections.addAll(multiset, elements);
        multiset.addAll(ELEMENTS_TO_FILTER_OUT);
        return Multisets.filter(multiset, PREDICATE);
      }

      @Override
      public List<String> order(List<String> insertionOrder) {

    }

    public void add(ModelProblem problem) {
        problems.add(problem);

        severities.add(problem.getSeverity());
    }

    public void addAll(List<ModelProblem> problems) {
        this.problems.addAll(problems);

        for (ModelProblem problem : problems) {
            severities.add(problem.getSeverity());
        }
    }

    @Override

                    List<Plugin> pre = predecessors.get(entry.getKey());
                    if (pre != null) {
                        result.addAll(pre);
                    }
                    result.add(entry.getValue());
                }
                result.addAll(pending);

                target.setPlugins(result);
            }
        }

        @Override

      }
    },
    BUILDER_ADD_ALL_COLLECTION {
      @Override
      public ImmutableMultiset<Object> create(List<?> keys) {
        ImmutableMultiset.Builder<Object> builder = ImmutableMultiset.builder();
        builder.addAll(keys);
        return builder.build();
      }
    };

    @CanIgnoreReturnValue
    @Override
    public abstract ImmutableMultiset<Object> create(List<?> keys);
  }

            final List<String> results = new ArrayList<>(Arrays.asList(SuggestUtil.parseQuery(queryString, tagFieldName)));
            if (filterQueryString != null) {
                results.addAll(Arrays.asList(SuggestUtil.parseQuery(filterQueryString, tagFieldName)));
            }
            return results.toArray(new String[0]);
        });

                return;
            }
        }

        fail();
    }

    @Override
    protected String getJsonPath() {
        return "response." + LIST_ENDPOINT_SUFFIX + ".findAll {it." + getKeyProperty() + ".startsWith(\"" + getNamePrefix() + "\")}";
    }

    @Override
    protected List<String> getIdList(final Map<String, Object> body) {