MutableVariantImpl copy = new MutableVariantImpl(variantName, attributes);
            copy.dependencies.addAll(this.dependencies);
            copy.dependencyConstraints.addAll(this.dependencyConstraints);
            copy.files.addAll(this.files);
            copy.capabilities.add(capability);
            copy.availableExternally = this.availableExternally;
            return copy;
        }

            }

            class TestUsage implements UsageContext {
                String name
                Usage usage
                Set dependencies = []
                Set dependencyConstraints = []
                Set artifacts = []
                Set capabilities = []
                Set globalExcludes = []
                AttributeContainer attributes = ImmutableAttributes.EMPTY
            }

            }

            class TestUsage implements UsageContext {
                String name
                Usage usage
                Set dependencies = []
                Set dependencyConstraints = []
                Set artifacts = []
                Set capabilities = []
                Set globalExcludes = []
                AttributeContainer attributes = ImmutableAttributes.EMPTY
            }

        DefaultDependencyConstraintSet        | DependencyConstraintSet        | "project.configurations.maybeCreate('some').dependencyConstraints"
        DefaultRepositoryHandler              | RepositoryHandler              | "project.repositories"
        DefaultMavenArtifactRepository        | ArtifactRepository             | "project.repositories.mavenCentral()"

     * Add a dependency constraint.
     *
     * @param dependencyConstraint dependency constraint to add
     */
    public static void call(DependencyCollector self, DependencyConstraint dependencyConstraint) {
        self.addConstraint(dependencyConstraint);
    }

    /**
     * Add a dependency constraint.
     *
     * @param dependencyConstraint dependency constraint to add

        // remain consistent with the behavior for dependencies.
        for (DependencyConstraint dependencyConstraint : configuration.getDependencyConstraints()) {
            dependencyBuilder.add(dependencyMetadataFactory.createDependencyConstraintMetadata(dependencyConstraint));
        }

        for (ExcludeRule excludeRule : configuration.getExcludeRules()) {

            return dependencyMetadata(dependency)
        }

        @Override
        LocalOriginDependencyMetadata createDependencyConstraintMetadata(DependencyConstraint dependencyConstraint) {
            throw new UnsupportedOperationException()
        }
    }

- `(c)`: This element is a <<dependency_constraints.adoc#sec:direct-vs-transitive-deps,dependency constraint>>, not a dependency. Look for the matching dependency elsewhere in the tree.

                    <ul id="controlling-transitive-dependencies">
                        <li><a href="../userguide/dependency_constraints.html">Upgrading Versions</a></li>
                        <li><a href="../userguide/dependency_downgrade_and_exclude.html">Downgrading and Excluding</a></li>

- The <<declaring_dependencies.adoc#declaring-dependencies,dependencies>> of the variant, including <<rich_versions.adoc#rich-version-constraints,rich versions>> — `withDependencies {}` block
- The <<dependency_constraints.adoc#sec:adding-constraints-transitive-deps,dependency constraints>> of the variant, including <<rich_versions.adoc#rich-version-constraints,rich versions>> — `withDependencyConstraints {}` block