*
   * @throws UnsupportedOperationException if comparator is not defined
   */
  public Comparator<T> comparator() {
    if (comparator != null) {
      return comparator;
    }
    throw new UnsupportedOperationException("This ordering does not define a comparator.");
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    if (obj == this) {
      return true;
    }

        when(mockRequest.getTreeId()).thenReturn(123);

        // Should throw NoAvailableChannelException when no healthy channels
        assertThrows(ChannelLoadBalancer.NoAvailableChannelException.class, () -> loadBalancer.selectChannel(mockRequest),
                "Should throw exception when no healthy channels available");
    }

            if (response.hasFailures()) {
                throw new SearchEngineClientException(response.buildFailureMessage());
            }
            return true;
        } catch (final InterruptedException e) {
            throw new InterruptedRuntimeException(e);
        } catch (final ExecutionException e) {
            throw new SearchEngineClientException("Failed to update bulk data.", e);
        }
    }

   */
  @VisibleForTesting transient @Nullable Object @Nullable [] elements;

  /**
   * Keeps track of metadata like the number of hash table bits and modifications of this data
   * structure (to make it possible to throw ConcurrentModificationException in the iterator). Note
   * that we choose not to make this volatile, so we do less of a "best effort" to track such
   * errors, for better performance.
   */
  private transient int metadata;

        // You can't say "assuming String is Integer".
        // And we don't support "assuming String is T"; user has to say "assuming T is String".
        throw new IllegalArgumentException("No type mapping from " + fromClass + " to " + to);
      }
    }.visit(from);
  }

  /**
   * Resolves all type variables in {@code type} and all downstream types and returns a

        this.identifier_authority = new byte[6];
        System.arraycopy(src, si, this.identifier_authority, 0, 6);
        si += 6;
        if (this.sub_authority_count > 100) {
            throw new RuntimeCIFSException("Invalid SID sub_authority_count");
        }
        this.sub_authority = new int[this.sub_authority_count];
        for (int i = 0; i < this.sub_authority_count; i++) {

            return result;
        } catch (InstantiationException | IllegalAccessException e) {
            final String msg = "Cannot create a new instance: " + entityType.getName();
            throw new IllegalBehaviorStateException(msg, e);
        }
    }

  AbstractImmutableBiMapMapInterfaceTest() {
    super(false, false, false, false, false);
  }

  @Override
  protected Map<K, V> makeEmptyMap() {
    throw new UnsupportedOperationException();
  }

  private static final Joiner JOINER = Joiner.on(", ");

  @Override
  protected final void assertMoreInvariants(Map<K, V> map) {
    BiMap<K, V> bimap = (BiMap<K, V>) map;

            try (InputStream in = Files.newInputStream(userToolchainsFile.toPath())) {
                toolchains = new PersistedToolchains(new MavenToolchainsStaxReader().read(in));
            } catch (Exception e) {
                throw new MisconfiguredToolchainException(
                        "Cannot read toolchains file at " + userToolchainsFile.getAbsolutePath(), e);
            }

        } else if (userToolchainsFile != null) {

        assertNotNull(service);
    }

    @Test
    public void test_setupStoreCondition_nullInput() {
        try {
            crawlingInfoService.setupStoreCondition(null);
            fail("Should throw FessSystemException for null input");
        } catch (final FessSystemException e) {
            assertEquals("Crawling Session is null.", e.getMessage());
        }
    }

    @Test