undefined method 'expect'

[elifoster]

When using the --use rspec flag, I get the following error on just about every test case once:

  1) Pair#flip! reverses the pair's values in place
     Failure/Error: expect(pair.right).to eq 1

     NoMethodError:
       undefined method `expect' for #<RSpec::ExampleGroups::Pair::Flip_2:0x007fcd58a3e260>
       Did you mean?  exec
     # ./spec/pair_spec.rb:43:in `block (3 levels) in <top (required)>'

The spec for this particular one is:

describe Pair do
...
  describe '#flip!' do
    it "reverses the pair's values in place" do
      pair = Pair.new(1, 2)
      pair.flip!
      expect(pair.right).to eq 1
      expect(pair.left).to eq 2
    end
  end
...
end

[dgollahon]

Could you share the corresponding source you are testing? As well as the full mutest command you are using?

Also, I assume these errors don't happen when you're just running rspec, right?

[elifoster]

The sources are at elifoster/data_types. This issue does not occur just using rspec.

The command is
'mutest --include lib --require data_types --use rspec' iirc (on mobile atm).

I'm back home, the command I'm running is mutest --include lib/data_types --require pair --use rspec 'Pair'