/** Creates and returns an instance of the graph to be tested. */
  abstract Graph<Integer> createGraph();

  /**
   * A proxy method that adds the node {@code n} to the graph being tested. In case of Immutable
   * graph implementations, this method should replace {@link #graph} with a new graph that includes
   * this node.
   */
  abstract void addNode(Integer n);

  /**

     */
    protected abstract void delayBeforeProcessing();

    /**
     * Delays the crawling process after processing a URL.
     */
    protected abstract void delayAfterProcessing();

    /**
     * Delays the crawling process when there are no URLs in the queue.
     */
    protected abstract void delayAtNoUrlInQueue();

    /**

This is acceptable:

```groovy
public interface NewThing {
    Property<String> getSomeProperty()
}

abstract class DefaultNewThing implements NewThing {
    // special logic to integrate with something existing
}
```

or

```groovy
public abstract class NewThing {
    public abstract Property<String> getSomeProperty()
    // special logic to integrate with something existing
}
```

import java.util.Properties


@CacheableTask
abstract class ClasspathManifest : DefaultTask() {

    @get:Input
    abstract val optionalProjects: ListProperty<String>

    @get:Internal
    abstract val projectDependencies: ConfigurableFileCollection

    @Input
    val runtime = externalDependencies.elements.map { it.map { it.asFile.name }.sorted() }

    @get:Internal
    abstract val externalDependencies: ConfigurableFileCollection

import jcifs.smb1.dcerpc.ndr.NdrBuffer;
import jcifs.smb1.dcerpc.ndr.NdrException;
import jcifs.smb1.dcerpc.ndr.NdrObject;

/**
 * Abstract base class for DCERPC messages.
 * This class provides common functionality for all DCE/RPC message types in SMB1 protocol.
 */
public abstract class DcerpcMessage extends NdrObject implements DcerpcConstants {

    /**
     * Default constructor for DcerpcMessage.

    @get:PathSensitive(PathSensitivity.NONE)
    abstract val unixScriptTemplate: ConfigurableFileCollection

    @get:InputFiles
    @get:PathSensitive(PathSensitivity.NONE)
    abstract val windowsScriptTemplate: ConfigurableFileCollection

    @get:OutputDirectory
    abstract val startScriptsDir: DirectoryProperty

    @get:Inject
    internal
    abstract val temporaryFileProvider: TemporaryFileProvider

                    """
                        package com.example;
                        import org.gradle.api.provider.Property;

                        public abstract class Task {
                            public abstract Property<String> getSourceCompatibility();
                        }
                    """
                )
            }
        ) {
            assertHasErrors(

setPluginContext(java.util.Map); public abstract java.util.Map getPluginContext(); } org/apache/maven/plugin/logging/Log.class package org.apache.maven.plugin.logging; public abstract interface Log { public abstract boolean isDebugEnabled(); public abstract void debug(CharSequence); public abstract void debug(CharSequence, Throwable); public abstract void debug(Throwable); public abstract boolean isInfoEnabled(); public abstract void info(CharSequence); public abstract void info(CharSequence, Throwable); public...

@GwtCompatible
abstract class Cut<C extends Comparable> implements Comparable<Cut<C>>, Serializable {
  final C endpoint;

  Cut(C endpoint) {
    this.endpoint = endpoint;
  }

  abstract boolean isLessThan(C value);

  abstract BoundType typeAsLowerBound();

  abstract BoundType typeAsUpperBound();

  abstract Cut<C> withLowerBoundType(BoundType boundType, DiscreteDomain<C> domain);

    @get:PathSensitive(PathSensitivity.RELATIVE)
    abstract val versionFile: RegularFileProperty

    @get:InputFile
    @get:PathSensitive(PathSensitivity.RELATIVE)
    abstract val releasedVersionsFile: RegularFileProperty

    @get:Input
    abstract val title: Property<String>

    @get:InputFiles
    @get:PathSensitive(PathSensitivity.RELATIVE)
    abstract val sources: ConfigurableFileCollection

    @get:OutputFile