clusters.rb

links = [
  {:a => :z},
  {:b => :z},
  {:c => :z},
  {:d => :y},
  {:e => :x},
  {:e => :w},
  {:e => :v},
  {:f => :u},
  {:f => :t},
  {:g => :t}
]

expected_clusters = [
  {:sources => [:a,:b,:c], :targets => [:z], :text => "a, b and c linked to z"},
  {:sources => [:d], :targets => [:y], :text => "d linked to y"},
  {:sources => [:e], :targets => [:x,:w,:v], :text => "e linked to x, w, and v"},
  {:sources => [:f,:g], :targets => [:u,:t], :text => "f and g linked to u and t"}
]