*     <li>Must provide a zero-args constructor that is not private.</li>
     *     <li>Must not define or inherit any instance fields.</li>
     *     <li>Should not provide an implementation for {@link Named#getName()} and should define this method as abstract. Any implementation will be overridden.</li>
     *     <li>Must not define or inherit any other abstract methods.</li>
     * </ul>
     *

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.function.Function;

/**
 * Constructs the application and implementation classpaths for a test process,
 * while also optionally loading test framework implementation dependencies from
 * the distribution.
 *
 * @see ForkedTestClasspath
 */
public class ForkedTestClasspathFactory {

          .build();

  /**
   * type → implementation. Inherently mutable interfaces and abstract classes are mapped to their
   * default implementations and are "new"d upon get().
   */
  private static final ConcurrentMap<Class<?>, Class<?>> implementations = Maps.newConcurrentMap();

  private static <T> void setImplementation(Class<T> type, Class<? extends T> implementation) {

     *
     * @param parser The XML parser
     * @return Name of the custom implementation; otherwise {@code null}
     */
    private static String parseImplementation(final XmlPullParser parser) {
        return parser.getAttributeValue(null, "implementation");
    }

    /**
     * Attempts to load the named implementation, uses default implementation if no name is given.

          .build();

  /**
   * type → implementation. Inherently mutable interfaces and abstract classes are mapped to their
   * default implementations and are "new"d upon get().
   */
  private static final ConcurrentMap<Class<?>, Class<?>> implementations = Maps.newConcurrentMap();

  private static <T> void setImplementation(Class<T> type, Class<? extends T> implementation) {

        configurations.getByName(mainSourceSet.getRuntimeClasspathConfigurationName()).extendsFrom(implementation, runtimeOnly);
        // Update the default test suite's source set to extend our "extension" feature's dependency scopes.
        configurations.getByName(JvmConstants.TEST_COMPILE_CLASSPATH_CONFIGURATION_NAME).extendsFrom(implementation);

            ImplementationInfo implementation = request.getImplementationInfo();
            List<ParameterSpec> parameters = callable.getParameters().stream()
                .map(parameter -> ParameterSpec.builder(typeName(parameter.getParameterType()), parameter.getName()).build())
                .collect(Collectors.toList());
            MethodSpec spec = MethodSpec.methodBuilder(implementation.getName())

                    publicType, implementationRegistration.getSource()));
            }
            if (managedPublicType) {
                throw new IllegalArgumentException(String.format("Cannot specify default implementation for managed type '%s'", publicType));
            }

   * any {@code Entry} instances already retrieved from the entry set (this is
   * implementation-dependent). Furthermore, implementations are not required to support
   * modifications to the entry set at all, and the {@code Entry} instances themselves don't even
   * have methods for modification. See the specific implementation class for more details on how
   * its entry set handles modifications.
   *

   * any {@code Entry} instances already retrieved from the entry set (this is
   * implementation-dependent). Furthermore, implementations are not required to support
   * modifications to the entry set at all, and the {@code Entry} instances themselves don't even
   * have methods for modification. See the specific implementation class for more details on how
   * its entry set handles modifications.
   *