encoder.writeString(variant.getDisplayName());
            attributeContainerSerializer.write(encoder, variant.getAttributes());
            writeCapabilities(encoder, variant.getCapabilities());
            write(encoder, variant.getExternalVariant().orElse(null));
        } else {
            encoder.writeSmallInt(index);
        }
    }

    @Override
    public List<DependencyResult> getDependenciesForVariant(ResolvedVariantResult variant) {
        if (!selectedVariants.contains(variant)) {
            reportInvalidVariant(variant);
        }
        return ImmutableList.copyOf(variantDependencies.get(variant));
    }

    private void reportInvalidVariant(ResolvedVariantResult variant) {
        Optional<ResolvedVariantResult> sameName = selectedVariants.stream()

    mainVariantImplementation[label=<main<i>Variant</i>Implementation>]
  }

  subgraph left {
    node[style=filled, fillcolor="#cfe2f3"]
    swiftCompileVariant -> nativeLinkVariant -> nativeRuntimeVariant [style=invis, weight=1000]

    swiftCompileVariant[label=<swiftCompile<i>Variant</i> (R)>]
    nativeLinkVariant[label=<nativeLink<i>Variant</i> (R)>]
    nativeRuntimeVariant[label=<nativeRuntime<i>Variant</i> (R)>]

    mainVariantImplementation[label=<main<i>Variant</i>Implementation>]
  }

  subgraph left {
    node[style=filled, fillcolor="#cfe2f3"]
    cppCompileVariant -> nativeLinkVariant -> nativeRuntimeVariant [style=invis, weight=1000]

    cppCompileVariant[label=<cppCompile<i>Variant</i> (R)>]
    nativeLinkVariant[label=<nativeLink<i>Variant</i> (R)>]
    nativeRuntimeVariant[label=<nativeRuntime<i>Variant</i> (R)>]

For example, unzipping a JAR transforms the artifact of the `java-api,jars` variant into the `java-api,classes` variant.
Such a transformation is called _Artifact Transform_.
Gradle allows registering artifact transforms, and when the dependency does not have the requested variant, then Gradle will try to find a chain of artifact transforms for creating the variant.

                project(':dep', "test:dep:unspecified") {
                    variant "${color}Variant", [color: color]
                    noArtifacts()
                }
            }
        }

        where:
        color << ['blue', 'red']
    }

    def "Fails with reasonable error message when no target variant can be found"() {
        given:
        settingsFile << "include 'dep'"

import javax.annotation.Nullable;

/**
 * State for a component variant that is used to perform dependency graph resolution.
 *
 * <p>This does not include any information about the artifacts of the variant, which are generally not required during graph resolution.</p>
 */
public interface VariantGraphResolveState extends HasAttributes {
    /**

        this.chain = chain;
    }

    /**
     * @return The transformed variant which results from applying the transform chain to the root variant.
     */
    public VariantDefinition getTransformedVariantDefinition() {
        return chain;
    }

    /**
     * @return The transform chain to apply to the root producer variant.
     */
    public TransformChain getTransformChain() {

    }

    @Override
    String getIdeBuildTaskName(String variant) {
        return "link${variant.capitalize()}"
    }

    @Override
    List<String> getTasksToBuildFromIde(String variant) {
        return [":compile${variant.capitalize()}Cpp", ":link${variant.capitalize()}"]
    }

    @Override
    String getVisualStudioProjectName() {

[[sec:cpp_unit_test_task_variants]]
=== Variant-dependent Tasks

The {cpp} Unit Test Plugin creates tasks based on the variants of the unit test component.
Read the <<building_cpp_projects.adoc#sec:introducing_build_variants-cpp,introduction to build variants>> for more information.
The following diagrams show the relationship between variant-dependent tasks.

.{cpp} Unit Test Plugin variant-dependent task graph