C filtered = filter(createUnfiltered(contents), EVEN);
          try {
            assertEquals(expectedResult, filtered.add(toAdd));
            assertTrue(EVEN.apply(toAdd));
          } catch (IllegalArgumentException e) {
            assertFalse(EVEN.apply(toAdd));
          }
        }
      }
    }

    public void testRemove() {

    } catch (IllegalArgumentException expected) {
    }
  }

  public void testInitialCapacity_setTwice() {
    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder().initialCapacity(16);
    try {
      // even to the same value is not allowed
      builder.initialCapacity(16);
      fail();
    } catch (IllegalStateException expected) {
    }
  }

  @GwtIncompatible // CacheTesting

 * href="https://github.com/google/guava/wiki/PrimitivesExplained#unsigned-support">unsigned
 * primitive utilities</a>.
 *
 * @author Louis Wasserman
 * @author Brian Milch
 * @author Colin Evans
 * @since 10.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public final class UnsignedLongs {
  private UnsignedLongs() {}

  public static final long MAX_VALUE = -1L; // Equivalent to 2^64 - 1

 *
 * <p>As an example of how this is used, imagine you have a class {@code MyServer} that creates a
 * {@link java.net.ServerSocket ServerSocket}, and you would like to ensure that the {@code
 * ServerSocket} is closed even if the {@code MyServer} object is garbage-collected without calling
 * its {@code close} method. You could use a finalizer to accomplish this, but that has a

 *
 * <p>As an example of how this is used, imagine you have a class {@code MyServer} that creates a
 * {@link java.net.ServerSocket ServerSocket}, and you would like to ensure that the {@code
 * ServerSocket} is closed even if the {@code MyServer} object is garbage-collected without calling
 * its {@code close} method. You could use a finalizer to accomplish this, but that has a

    tests, either. This causes it to fail to find AtomicLongMapTest.

    Our workaround is to tell GWT that util.concurrent and all other packages
    have prod supersource, even if they have none. GWT is happy to ignore us
    when we specify a nonexistent path.

    (I hope that this workaround does not cause its own problems in the future.)
-->
<super-source path="super"/>

    tests, either. This causes it to fail to find AtomicLongMapTest.

    Our workaround is to tell GWT that util.concurrent and all other packages
    have prod supersource, even if they have none. GWT is happy to ignore us
    when we specify a nonexistent path.

    (I hope that this workaround does not cause its own problems in the future.)
-->
<super-source path="super"/>

    tests, either. This causes it to fail to find AtomicLongMapTest.

    Our workaround is to tell GWT that util.concurrent and all other packages
    have prod supersource, even if they have none. GWT is happy to ignore us
    when we specify a nonexistent path.

    (I hope that this workaround does not cause its own problems in the future.)
-->
<super-source path="super"/>

    tests, either. This causes it to fail to find AtomicLongMapTest.

    Our workaround is to tell GWT that util.concurrent and all other packages
    have prod supersource, even if they have none. GWT is happy to ignore us
    when we specify a nonexistent path.

    (I hope that this workaround does not cause its own problems in the future.)
-->
<super-source path="super"/>

    tests, either. This causes it to fail to find AtomicLongMapTest.

    Our workaround is to tell GWT that util.concurrent and all other packages
    have prod supersource, even if they have none. GWT is happy to ignore us
    when we specify a nonexistent path.

    (I hope that this workaround does not cause its own problems in the future.)
-->
<super-source path="super"/>