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

require_relative '../../spec_helper'

ruby_version_is '2.5' do
  describe "Integer#anybits?" do
    it "returns true iff all the bits of the argument are set in the receiver" do
      42.anybits?(42).should == true
      0b1010_1010.anybits?(0b1000_0010).should == true
      0b1010_1010.anybits?(0b1000_0001).should == true
      0b1000_0010.anybits?(0b0010_1100).should == false
      different_bignum = (2 * bignum_value) & (~bignum_value)
      (0b1010_1010 | different_bignum).anybits?(0b1000_0010 | bignum_value).should == true
      (0b1010_1010 | different_bignum).anybits?(0b0010_1100 | bignum_value).should == true
      (0b1000_0010 | different_bignum).anybits?(0b0010_1100 | bignum_value).should == false
    end

    it "handles negative values using two's complement notation" do
      (~42).anybits?(42).should == false
      (-42).anybits?(-42).should == true
      (~0b100).anybits?(~0b1).should == true
      (~(0b100 | bignum_value)).anybits?(~(0b1 | bignum_value)).should == true
    end

    it "coerces the rhs using to_int" do
      obj = mock("the int 0b10")
      obj.should_receive(:to_int).and_return(0b10)
      0b110.anybits?(obj).should == true
    end

    it "raises a TypeError when given a non-Integer" do
      -> {
        (obj = mock('10')).should_receive(:coerce).any_number_of_times.and_return([42,10])
        13.anybits?(obj)
      }.should raise_error(TypeError)
      -> { 13.anybits?("10")    }.should raise_error(TypeError)
      -> { 13.anybits?(:symbol) }.should raise_error(TypeError)
    end
  end
end