space.rb

# Here are the pertinent equality methods in the Space class. You can view the whole thing here:
# http://github.com/siannopollo/joshua_son_of_nun/tree/master/lib/joshua_son_of_nun/space.rb

def to_s
  [row.to_s + column.to_s, orientation].compact * ' '
end
alias_method :inspect, :to_s

def ===(klass)
  self.is_a?(klass)
end

def ==(other)
  to_s == other.to_s
end

def eql?(other)
  self == other
end

def equal?(other)
  self.eql?(other) && other === self.class
end

space_spec.rb

# This doesn't work, and I'm assuming it is because of my equality methods in the Space class

it "should work as expected in an array" do
  array_one = ['A1', 'B2', 'C3'].collect {|s| Space(s)}
  array_two = ['A1', 'C3'].collect {|s| Space(s)}
  (array_one - array_two).should == [Space('B2')]
  (array_one & array_two).should == [Space('A1'), Space('C3')]
end