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require File.expand_path('../../../spec_helper', __FILE__)
describe "Integer#nobits?" do
it "returns true iff all no bits of the argument are set in the receiver" do
42.nobits?(42).should == false
0b1010_1010.nobits?(0b1000_0010).should == false
0b1010_1010.nobits?(0b1000_0001).should == false
0b0100_0101.nobits?(0b1010_1010).should == true
different_bignum = (2 * bignum_value) & (~bignum_value)
(0b1010_1010 | different_bignum).nobits?(0b1000_0010 | bignum_value).should == false
(0b1010_1010 | different_bignum).nobits?(0b1000_0001 | bignum_value).should == false
(0b0100_0101 | different_bignum).nobits?(0b1010_1010 | bignum_value).should == true
end
it "handles negative values using two's complement notation" do
(~0b1101).nobits?(0b1101).should == true
(-42).nobits?(-42).should == false
(~0b1101).nobits?(~0b10).should == false
(~(0b1101 | bignum_value)).nobits?(~(0b10 | bignum_value)).should == false
end
it "coerces the rhs using to_int" do
obj = mock("the int 0b10")
obj.should_receive(:to_int).and_return(0b10)
0b110.nobits?(obj).should == false
end
it "raises a TypeError when given a non-Integer" do
lambda {
(obj = mock('10')).should_receive(:coerce).any_number_of_times.and_return([42,10])
13.nobits?(obj)
}.should raise_error(TypeError)
lambda { 13.nobits?("10") }.should raise_error(TypeError)
lambda { 13.nobits?(:symbol) }.should raise_error(TypeError)
end
end
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