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rubyrspecxor

rspec XOR should include

I want to check for the presence of exactly one of two possible strings in my rspec test (XOR).

Something to the effect of this:

it "worked" do
  ( 
    foo.bar.should include "A" AND foo.bar.should_not include "B" 
    ||
    foo.bar.should include "B" AND foo.bar.should_not include "A" 
  )
  # => if the above is false rspec should complain
end

Is this possible?

Solution

  • How about:

    expect(foo.bar & ['A', 'B']).to have(1).item

    This solution takes the array, intersects it with the possible values, and makes sure that only one element (either 'A' or 'B') is left.

    @steenslag's answer fails because when rspec expectations fail, they stop the test, so "two falses don't make a true"...

    If you want to use the old should syntax, it would look like this:

    (foo.bar & ['A', 'B']).should have(1).item