ruby--ruby/spec/ruby/core/integer/plus_spec.rb

require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../shared/arithmetic_coerce', __FILE__)

describe "Integer#+" do
  ruby_version_is "2.4"..."2.5" do
    it_behaves_like :integer_arithmetic_coerce_rescue, :+
  end

  ruby_version_is "2.5" do
    it_behaves_like :integer_arithmetic_coerce_not_rescue, :+
  end

  context "fixnum" do
    it "returns self plus the given Integer" do
      (491 + 2).should == 493
      (90210 + 10).should == 90220

      (9 + bignum_value).should == 9223372036854775817
      (1001 + 5.219).should == 1006.219
    end

    it "raises a TypeError when given a non-Integer" do
      lambda {
        (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
        13 + obj
      }.should raise_error(TypeError)
      lambda { 13 + "10"    }.should raise_error(TypeError)
      lambda { 13 + :symbol }.should raise_error(TypeError)
    end
  end

  context "bignum" do
    before :each do
      @bignum = bignum_value(76)
    end

    it "returns self plus the given Integer" do
      (@bignum + 4).should == 9223372036854775888
      (@bignum + 4.2).should be_close(9223372036854775888.2, TOLERANCE)
      (@bignum + bignum_value(3)).should == 18446744073709551695
    end

    it "raises a TypeError when given a non-Integer" do
      lambda { @bignum + mock('10') }.should raise_error(TypeError)
      lambda { @bignum + "10" }.should raise_error(TypeError)
      lambda { @bignum + :symbol}.should raise_error(TypeError)
    end
  end
end