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require File.expand_path('spec_helper', File.dirname(__FILE__))

describe Walrat::NotPredicate do
  it 'complains on trying to parse a nil string' do
    expect do
      Walrat::NotPredicate.new('irrelevant').parse nil
    end.to raise_error(ArgumentError, /nil string/)
  end

  it 'can be compared for equality' do
    Walrat::NotPredicate.new('foo').
      should eql(Walrat::NotPredicate.new('foo'))      # same
    Walrat::NotPredicate.new('foo').
      should_not eql(Walrat::NotPredicate.new('bar'))  # different
    Walrat::NotPredicate.new('foo').
      should_not eql(Walrat::Predicate.new('foo'))     # different class
  end
end