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module Contracts
RSpec.describe Invariants do
def new_subject
MyBirthday.new(31, 12)
end
it "works when all invariants are holding" do
expect { new_subject.clever_next_day! }.not_to raise_error
expect { new_subject.clever_next_month! }.not_to raise_error
end
it "raises invariant violation error when any of invariants are not holding" do
expect { new_subject.silly_next_day! }.to raise_error(InvariantError, /day condition to be true/)
expect { new_subject.silly_next_month! }.to raise_error(InvariantError, /month condition to be true/)
end
end
end
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