then:
        Matchers.strictlyEquals(spec11.toKey(), spec11.toKey())
        Matchers.strictlyEquals(spec11.toKey(), spec11Impl1.toKey())
        Matchers.strictlyEquals(spec11Vendor1.toKey(), spec11Vendor1.toKey())
        !Matchers.strictlyEquals(spec11Vendor1.toKey(), spec11Vendor2.toKey())
        !Matchers.strictlyEquals(spec11.toKey(), spec12.toKey())
        Matchers.strictlyEquals(spec11Impl1.toKey(), spec11Impl1.toKey())

    return headMap(toKey, false);
  }

  /**
   * This method returns a {@code ImmutableSortedMap}, consisting of the entries whose keys are less
   * than (or equal to, if {@code inclusive}) {@code toKey}.
   *
   * <p>The {@link SortedMap#headMap} documentation states that a submap of a submap throws an
   * {@link IllegalArgumentException} if passed a {@code toKey} greater than an earlier {@code

    }

    @Override
    public SortedMap<K, V> headMap(@ParametricNullness K toKey) {
      return headMap(toKey, false);
    }

    @Override
    public NavigableMap<K, V> headMap(@ParametricNullness K toKey, boolean inclusive) {
      return Maps.unmodifiableNavigableMap(delegate.headMap(toKey, inclusive));
    }

    @Override

    }

    @Override
    public SortedMap<K, V> headMap(@ParametricNullness K toKey) {
      return headMap(toKey, false);
    }

    @Override
    public NavigableMap<K, V> headMap(@ParametricNullness K toKey, boolean inclusive) {
      return Maps.unmodifiableNavigableMap(delegate.headMap(toKey, inclusive));
    }

    @Override

    public DefaultToolchainSpec() {
        getVendor().convention(getConventionVendor());
        getImplementation().convention(getConventionImplementation());
    }
    @Override
    public JavaToolchainSpecInternal.Key toKey() {
        return new Key(getLanguageVersion().getOrNull(), getVendor().getOrNull(), getImplementation().getOrNull());
    }

    @Override
    public boolean isConfigured() {

        return objectFactory.newInstance(SpecificInstallationToolchainSpec.class, JavaExecutableUtils.resolveJavaHomeOfExecutable(executable));
    }

    @Override
    public Key toKey() {
        return new Key(javaHome);
    }

    @Override
    public boolean isConfigured() {
        return true;
    }

    @Override
    public boolean isValid() {
        return true;
    }

							fromKey := from.Config().ClusterLocalFQDN()
							toKey := to.Config().ClusterLocalFQDN()
							if testTopology[fromKey] == nil {
								testTopology[fromKey] = map[string]int{}
							}
							testTopology[fromKey][toKey]++
						})
				},
				expect: map[string]map[string]int{
					"a.echo1.svc.cluster.local": {

					res[fromKey] = map[Reference]*Grants{}
				}
				if _, f := res[fromKey][toKey]; !f {
					res[fromKey][toKey] = &Grants{
						AllowedNames: sets.New[string](),
					}
				}
				if to.Name != nil {
					res[fromKey][toKey].AllowedNames.Insert(string(*to.Name))
				} else {
					res[fromKey][toKey].AllowAll = true
				}
			}
		}
	}
	return res
}