first_matching_key_value_spec.rb

def value_of_first_matching_key_in_hash(hash, array_of_keys)
end

describe do
  it 'searches a hash for an array of keys and returns the value of the first found' do
    keys = [:a, :b, :c]

    hash = {:c => 3, :b => 2, :a => 1}
    expect(value_of_first_matching_key_in_hash(hash, keys)).to eql 1

    hash = {:z => 1, :b => 2, :c => 3}
    expect(value_of_first_matching_key_in_hash(hash, keys)).to eql 2
  end
end