Add tests for findVariant behavior that provides the matching
behaviors of AddVariationDependencies, AddFarVariationDependencies,
etc.
Test: Test_findVariant
Change-Id: I3494d57179c8b3d62f7d32e5a1b43c9b9672c2df
Blueprint is a meta-build system that reads in Blueprints files that describe
modules that need to be built, and produces a
Ninja manifest describing the commands that
need to be run and their dependencies. Where most build systems use built-in
rules or a domain-specific language to describe the logic for converting module
descriptions to build rules, Blueprint delegates this to per-project build
logic written in Go. For large, heterogenous projects this allows the inherent
complexity of the build logic to be maintained in a high-level language, while
still allowing simple changes to individual modules by modifying easy to
understand Blueprints files.