Rspec: Should be (this or that)

Question

What would be the best way to write the rspec in a situation where either of two (or more) outcomes are acceptable?

Here\'s an example of what I want to do. This is

Answer 1

I'd probably write something like this:

it "should be heads or tails" do
  ["heads", "tails"].should include flip_coin
end

Answer 2

ActiveSupport provides Object#in? method. You can combine it with RSpec and simply use the following:

flip_coin.should be_in(["heads", "tails"])

Or with new Rspec 3 syntax:

expect(flip_coin).to be_in(["heads", "tails"])

Answer 3

if applied or with be matcher

expect(flip_coin).to eq('heads').or(be == 'tails')

Answer 4

You can solve this by flipping the comparison:

expect(['head','tails']).to include(flip_coin)

Answer 5

I know this is old but in I ran into this on RSpec 3.4, there is an or keyword now. So this is valid:

expect(flip_coin).to eq('heads').or(eq('tails'))

Answer 6

Another way of writing it with the expectation on the right of the should:

it 'should be heads or tails' do
  flip_coin.should satisfy{|s| ['heads', 'tails'].include?(s)}
end