require File.dirname(__FILE__) + '/../spec_helper'

describe Gecode::Constraints::Expression do
  it 'should raise error if it doesn\'t get all parameters for initialization' do
    lambda do 
      Gecode::Constraints::Expression.new(Gecode::Model.new, :negate => false) 
    end.should raise_error(ArgumentError)
  end
end

describe Gecode::Constraints::IntEnum::Expression do
  it 'should raise error unless lhs is an int enum' do
    lambda do
      Gecode::Constraints::IntEnum::Expression.new(Gecode::Model.new, 
        :lhs => 'foo', :negate => false)
    end.should raise_error(TypeError)
  end
end

describe Gecode::Constraints::SetEnum::Expression do
  it 'should raise error unless lhs is a set enum' do
    lambda do
      Gecode::Constraints::SetEnum::Expression.new(Gecode::Model.new, 
        :lhs => 'foo', :negate => false)
    end.should raise_error(TypeError)
  end
end

describe Gecode::Constraints::Int::CompositeStub, ' (not subclassed)' do
  before do
    @con = Gecode::Constraints::Int::CompositeStub.new(Gecode::Model.new, {})
  end

  it 'should raise error when calling #constrain_equal' do
    lambda do 
      @con.instance_eval{ constrain_equal(nil, {}, false) }
    end.should raise_error(NoMethodError)
  end
end

describe Gecode::Constraints::Constraint, ' (not subclassed)' do
  before do
    @con = Gecode::Constraints::Constraint.new(Gecode::Model.new, {})
  end

  it 'should raise error when calling #post because it\'s not overridden' do
    lambda{ @con.post }.should raise_error(NoMethodError)
  end
end

describe Gecode::Constraints::Util do
  it 'should raise error when giving incorrect set to #constant_set_to_params' do
    lambda do 
      Gecode::Constraints::Util.constant_set_to_params('hello')
    end.should raise_error(TypeError)
  end
end

describe Gecode::Constraints::CompositeExpression do
  it 'should raise error if a method doesn\'t exist' do
    expression = Gecode::Constraints::CompositeExpression.new(
      Gecode::Constraints::Int::Expression, Gecode::FreeIntVar, 
      lambda{ }, Gecode::Model.new, {:lhs => nil, :negate => false}){}
    lambda do
      expression.this_method_does_not_exist
    end.should raise_error(NoMethodError)
  end
end