import org.gradle.api.internal.artifacts.transform.TransformStep;
import org.gradle.api.internal.attributes.ImmutableAttributes;

/**
 * Registration of an artifact transform.
 */
public interface TransformRegistration {
    /**
     * Attributes that match the variant that is consumed.
     */
    ImmutableAttributes getFrom();

    /**
     * Attributes that match the variant that is produced.
     */

import org.gradle.api.artifacts.transform.TransformSpec;
import org.gradle.api.artifacts.transform.VariantTransformConfigurationException;
import org.gradle.api.attributes.AttributeContainer;
import org.gradle.api.internal.artifacts.TransformRegistration;
import org.gradle.api.internal.artifacts.VariantTransformRegistry;
import org.gradle.api.internal.attributes.AttributeContainerInternal;
import org.gradle.api.internal.attributes.ImmutableAttributesFactory;

    }

    /**
     * A node in a chain of artifact transforms.
     */
    private static class ChainNode {
        final ChainNode next;
        final TransformRegistration transform;
        public ChainNode(@Nullable ChainNode next, TransformRegistration transform) {
            this.next = next;
            this.transform = transform;
        }
    }

    /**

import org.gradle.api.artifacts.transform.TransformParameters;
import org.gradle.api.internal.artifacts.TransformRegistration;
import org.gradle.api.internal.attributes.ImmutableAttributes;

import javax.annotation.Nullable;

public interface TransformRegistrationFactory {

import org.gradle.api.artifacts.transform.TransformAction;
import org.gradle.api.artifacts.transform.TransformParameters;
import org.gradle.api.internal.DomainObjectContext;
import org.gradle.api.internal.artifacts.TransformRegistration;
import org.gradle.api.internal.attributes.ImmutableAttributes;
import org.gradle.api.internal.file.FileCollectionFactory;
import org.gradle.api.internal.file.FileLookup;

import org.gradle.api.artifacts.type.ArtifactTypeDefinition;
import org.gradle.api.attributes.AttributeContainer;
import org.gradle.api.internal.CollectionCallbackActionDecorator;
import org.gradle.api.internal.artifacts.TransformRegistration;
import org.gradle.api.internal.artifacts.VariantTransformRegistry;
import org.gradle.api.internal.attributes.AttributeContainerInternal;
import org.gradle.api.internal.attributes.ImmutableAttributes;

     *
     * @see TransformAction
     */
    <T extends TransformParameters> void registerTransform(Class<? extends TransformAction<T>> actionType, Action<? super TransformSpec<T>> registrationAction);

    List<TransformRegistration> getRegistrations();

        }
        def expectedSteps = registrations*.transformStep
        assert actualSteps == expectedSteps
    }

    private TransformRegistration registration(AttributeContainer from, AttributeContainer to) {
        return Mock(TransformRegistration) {
            getFrom() >> from
            getTo() >> to
            getTransformStep() >> Stub(TransformStep)
        }
    }

import org.gradle.api.attributes.AttributeContainer
import org.gradle.api.file.FileCollection
import org.gradle.api.internal.CollectionCallbackActionDecorator
import org.gradle.api.internal.artifacts.TransformRegistration
import org.gradle.api.internal.artifacts.VariantTransformRegistry
import org.gradle.api.internal.artifacts.ivyservice.resolveengine.artifact.DefaultLocalFileDependencyBackedArtifactSet