class FooPolicy < ActionPolicy::Base
  def manage?
    deny!(:reason_a) unless condition_a?
    deny!(:reason_b) unless condition_b?
    true
  end
end

describe FooPolicy do
  describe_rule :manage? do
    context "when condition A is not met" { failed }
    context "when condition B is not met" { failed }
    context "when all conditions are met" { succeed }
  end
end

describe FooPolicy do
  describe_rule :manage? do
    context "when condition A is not met" { failed_with_reason(:reason_a) }
    context "when condition B is not met" { failed_with_reason(:reason_b) }
    context "when all conditions are met" { succeed }
  end
end