try {
              network.edgeConnectingOrNull(node, otherNode);
              fail();
            } catch (IllegalArgumentException expected) {
            }
            try {
              network.edgeConnecting(node, otherNode);
              fail();
            } catch (IllegalArgumentException expected) {
            }
        }

import static java.util.concurrent.Executors.newFixedThreadPool;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertThrows;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import java.util.Set;
import java.util.concurrent.Callable;