when:
        run "transform2"

        then:
        result.assertTasksExecuted(":transform2")
        result.assertTasksSkipped(":transform2")

        when:
        run "transform1"

        then:
        result.assertTasksExecuted(":transform1")
        result.assertTasksNotSkipped(":transform1")

        when:

        then:
        output.count("> Transform lib1.jar (project :lib) with MakeBlueToGreenThings") == 1
        output.count("> Transform lib2.jar (project :lib) with MakeBlueToGreenThings") == 1
        output.count("> Transform lib1.jar (project :lib) with MakeGreenToYellowThings") == 1
        output.count("> Transform lib2.jar (project :lib) with MakeGreenToYellowThings") == 1

        byte[] getHashBytes();

        /**
         * The hash of the classloader that loaded the transform action implementation.
         * <p>
         * Null if the classloader is not managed by Gradle.
         */
        @Nullable
        byte[] getClassLoaderHashBytes();

        /**
         * The class name of the transform's action.
         */
        @Nullable
        String getImplementationClassName();

        spec.optimized >> optimize

        expect:
        def args = transformer.transform(spec)
        args.containsAll(expected)

        where:
        debug | optimize | expected
        true  | false    | ["-g"]
        false | true     | ["-O3"]
        true  | true     | ["-g", "-O3"]
    }

    def "transforms system header and include args correctly"() {
        def spec = Stub(NativeCompileSpec)

     *
     * @param problem the problem to transform
     * @param id the operation id associated with the problem
     * @return the transformed problem
     */
    Problem transform(Problem problem, OperationIdentifier id);

        when:
        fails ":resolve"

        then:
        failure.assertHasCause("Failed to transform bad-b.jar to match attributes {artifactType=size}")
        failure.assertHasCause("Failed to transform bad-c.jar to match attributes {artifactType=size}")
    }

    def "only one transformer execution per workspace"() {

        createDirs("lib", "app1", "app2")
        settingsFile << """

package org.gradle.internal.classpath.transforms;

import org.gradle.internal.classpath.ClasspathBuilder;
import org.gradle.internal.classpath.ClasspathEntryVisitor;
import org.gradle.internal.classpath.ClasspathWalker;
import org.gradle.internal.classpath.types.InstrumentationTypeRegistry;

import java.io.File;
import java.io.IOException;

When a user runs a Gradle build Gradle it uses transformed plugin jars. 
The whole transformation process normally happens on the first use of a build or when a plugin jar is added to the build script classpath.
We transform the jar and cache transformed jars for future use.

We transform plugins classpath, TestKit classpath and buildscript classes separately. 

    /**
     * The from attributes of the registered transform.
     */
    Map<String, String> getFromAttributes();

    /**
     * The to attributes of the registered transform.
     */
    Map<String, String> getToAttributes();

    /**
     * The file name of the input artifact that is about to be transformed.
     */
    String getArtifactName();

    /**

        this.typeRegistry = typeRegistry;
        this.transform = transform;
    }

    @Override
    public final void transform(File destination) {
        resultBuilder().accept(destination, builder -> {
            try {
                visitEntries(builder);
            } catch (FileException e) {
                // Badly formed archive, so discard the contents and produce an empty JAR