transformRegistry.registrations >> [transform1, transform2, transform3, transform4, transform5, transform6]

        when:
        def result = transformations.findTransformedVariants(variants, requested)

        then:
        result.size() == 2
        // sourceVariant + transform2 + transform3 = compatible
        assertTransformChain(result[0], sourceVariant, compatible, transform2, transform3)

	Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error)

	// Reset resets the state and allows a Transformer to be reused.
	Reset()
}

// SpanningTransformer extends the Transformer interface with a Span method
// that determines how much of the input already conforms to the Transformer.
type SpanningTransformer interface {
	Transformer

        1 * transform1.transform(someValue()) >> someOtherValue()
        1 * transform2.transform(someOtherValue()) >> someOtherValue2()
        1 * transform3.transform(someOtherValue2()) >> someOtherValue3()
        0 * _
    }

    def "can chain mapped providers with filtering providers"() {
        def transform1 = Mock(Transformer)
        def spec = Mock(Spec)
        def transform2 = Mock(Transformer)

        given:

    def "reuses file from its origin cache when transform is none"() {
        given:
        def file = testDir.file("other/thing.jar")
        _ * globalCacheLocations.isInsideGlobalCache(file.absolutePath) >> true
        jar(file)
        def classpath = DefaultClassPath.of(file)
        transformer.transform(classpath, None)

        when:
        def cachedClasspath = transformer.transform(classpath, None)

        then:

import org.gradle.internal.Either;
import org.gradle.internal.classpath.transforms.ClassTransform;
import org.gradle.internal.classpath.transforms.ClasspathElementTransformFactory;
import org.gradle.internal.classpath.transforms.ClasspathElementTransformFactoryForAgent;
import org.gradle.internal.classpath.transforms.ClasspathElementTransformFactoryForLegacy;
import org.gradle.internal.classpath.transforms.InstrumentingClassTransform;

== Artifact transform selection and execution

As described above, when Gradle resolves a configuration and a dependency in the configuration does not have a variant with the requested attributes, Gradle tries to find a chain of artifact transforms to create the variant.
The process of finding a matching chain of artifact transforms is called _artifact transform selection_.

         * @param transforms The remaining transforms which may be prepended to {@code chain} to produce a solution.
         */
        public ChainState(@Nullable ChainNode chain, ImmutableAttributes requested, ImmutableFilteredList<TransformRegistration> transforms) {
            this.chain = chain;
            this.requested = requested;
            this.transforms = transforms;
        }
    }

    /**

         *
         * @param original the original JAR or classes directory
         * @param transformed the transformed JAR or classes directory
         * @return this builder
         */
        public Builder add(File original, File transformed) {
            originals.add(original);
            if (!original.equals(transformed)) {

        def outputJar = testDir.file("transformed.jar")
        return new JarTestFixture(transform(factory, originalJar, outputJar), 'UTF-8', null, /* checkManifest */ false)
    }

    private TestFile transformDirectory(TransformFactoryType factory, File originalDir) {
        def outputDir = testDir.file("transformed")
        return new TestFile(transform(factory, originalDir, outputDir))
    }

        when:
        run "transform2"

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

        when:
        run "transform1"

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

        when: