assertThrows(
        UnsupportedOperationException.class,
        () -> multimap().putAll(getSubjectGenerator().create(mapEntry(k3(), v3()))));
  }

  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutAllIntoEmpty() {
    Multimap<K, V> target = getSubjectGenerator().create();
    assertEquals(!multimap().isEmpty(), target.putAll(multimap()));
    assertEquals(multimap(), target);
  }

  @MapFeature.Require(SUPPORTS_PUT)

    Cache<Integer, Integer> cache = CacheBuilder.newBuilder().build();

    cache.putAll(ImmutableMap.of(10, 20, 30, 50, 60, 90));

    assertEquals(Integer.valueOf(20), cache.getIfPresent(10));
    assertEquals(Integer.valueOf(50), cache.getIfPresent(30));
    assertEquals(Integer.valueOf(90), cache.getIfPresent(60));

    cache.asMap().putAll(ImmutableMap.of(10, 50, 30, 20, 60, 70, 5, 5));

        ImmutableListMultimap.<Character, Character>builder()
            .putAll('b', Arrays.asList('a', 'n', 'a', 'n', 'a'))
            .putAll('a', Arrays.asList('p', 'p', 'l', 'e'))
            .putAll('c', Arrays.asList('a', 'r', 'r', 'o', 't'))
            .putAll('a', Arrays.asList('s', 'p', 'a', 'r', 'a', 'g', 'u', 's'))
            .putAll('c', Arrays.asList('h', 'e', 'r', 'r', 'y'))
            .build();

        multimap = create();
        multimap.putAll("foo", asList(2, 3));
        multimap.putAll("bar", asList(4, 5));
        multimap.putAll("foo", asList(6));
        multimap.putAll("baz", asList(7, 8));
        multimap.putAll("dog", asList(9));
        multimap.putAll("bar", asList(10, 11));
        multimap.putAll("cat", asList(12, 13, 14));
        return multimap.keySet().iterator();
      }

   *     ImmutableListMultimap.<Character, Character>builder()
   *         .putAll('b', Arrays.asList('a', 'n', 'a', 'n', 'a'))
   *         .putAll('a', Arrays.asList('p', 'p', 'l', 'e'))
   *         .putAll('c', Arrays.asList('a', 'r', 'r', 'o', 't'))
   *         .putAll('a', Arrays.asList('s', 'p', 'a', 'r', 'a', 'g', 'u', 's'))
   *         .putAll('c', Arrays.asList('h', 'e', 'r', 'r', 'y'))
   *         .build();
   * }

    assertThrows(NullPointerException.class, () -> putAll(containsNullKey));
    expectUnchanged();
    expectNullKeyMissingWhenNullKeysUnsupported(
        "Should not contain null key after unsupported putAll(containsNullKey)");
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_VALUES})
  public void testPutAll_nullValueSupported() {
    putAll(containsNullValue);
    expectAdded(containsNullValue.get(0));
  }

    }

    @CanIgnoreReturnValue
    @Override
    public Builder<K, V> putAll(Map<? extends K, ? extends V> map) {
      super.putAll(map);
      return this;
    }

    @CanIgnoreReturnValue
    @Override
    public Builder<K, V> putAll(Iterable<? extends Entry<? extends K, ? extends V>> entries) {
      super.putAll(entries);
      return this;
    }

    @CanIgnoreReturnValue

   *     ImmutableSetMultimap.<Character, Character>builder()
   *         .putAll('b', Arrays.asList('a', 'n', 'a', 'n', 'a'))
   *         .putAll('a', Arrays.asList('p', 'p', 'l', 'e'))
   *         .putAll('c', Arrays.asList('a', 'r', 'r', 'o', 't'))
   *         .putAll('a', Arrays.asList('s', 'p', 'a', 'r', 'a', 'g', 'u', 's'))
   *         .putAll('c', Arrays.asList('h', 'e', 'r', 'r', 'y'))
   *         .build();
   *

                }
            }

        }
        catch ( IOException ioe ) {
            log.error("Failed to load config", ioe); //$NON-NLS-1$
        }
        p.putAll(System.getProperties());
        if ( props != null ) {
            p.putAll(props);
        }
        INSTANCE = new SingletonContext(p);
    }


    /**
     * Get singleton context
     * 

        }
        return defaultValue;
    }

    public DataStoreParams newInstance() {
        return new DataStoreParams(params);
    }

    public void putAll(final Map<String, String> map) {
        params.putAll(map);
    }

    public boolean containsKey(final String key) {
        return params.containsKey(key);
    }

    public Map<String, Object> asMap() {