rankdir=LR

  compileVariantSwift -> {linkVariant, createVariant} -> assembleVariant [dir=back, style=dashed]
  compileVariantSwift[label=<compile<i>Variant</i>Swift>]
  linkVariant[label=<link<i>Variant</i>>]
  createVariant[label=<create<i>Variant</i>>]
  assembleVariant[label=<assemble<i>Variant</i>>]

  // Adds linkage text between link* and create*
  linkVariant -> linkageText -> createVariant [style=invis]

  rankdir=LR

  compileVariantCpp -> {linkVariant, createVariant} -> assembleVariant [dir=back, style=dashed]
  compileVariantCpp[label=<compile<i>Variant</i>Cpp>]
  linkVariant[label=<link<i>Variant</i>>]
  createVariant[label=<create<i>Variant</i>>]
  assembleVariant[label=<assemble<i>Variant</i>>]

  // Adds linkage text between link* and create*
  linkVariant -> linkageText -> createVariant [style=invis]

cpp-library-variant-task-graph.png...

swift-library-variant-task-graph.png...

  compileTestVariantCpp -> linkTestVariant -> installTestVariant -> runTestVariant [dir=back, style=dashed]
  compileTestVariantCpp[label=<compile<i>Variant</i>Cpp>]
  linkTestVariant[label=<link<i>Variant</i>>]
  installTestVariant[label=<installTest<i>Variant</i>>]
  runTestVariant[label=<runTest<i>Variant</i>>]

cpp-application-variant-task-graph.png...

swift-application-variant-task-graph.png...

cpp-unit-test-variant-task-graph.png...

		return cr
	}
	return r
}

// Variant represents a registered variant of a language as defined by BCP 47.
type Variant struct {
	ID  uint8
	str string
}

// ParseVariant parses and returns a Variant. An error is returned if s is not
// a valid variant.
func ParseVariant(s string) (v Variant, err error) {
	defer func() {
		if recover() != nil {
			v = Variant{}
			err = ErrSyntax
		}
	}()

As a consequence, if we want our instrumented classes to be used in place of this variant when executing tests, we need to attach similar attributes to our variant.
In fact, the attribute we care about is `org.gradle.libraryelements` which explains _what the variant contains_, so we can setup the variant this way:

.Declaring the variant attributes
====