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require_relative '../../spec_helper'
describe "Integer#allbits?" do
it "returns true if and only if all the bits of the argument are set in the receiver" do
42.allbits?(42).should == true
0b1010_1010.allbits?(0b1000_0010).should == true
0b1010_1010.allbits?(0b1000_0001).should == false
0b1000_0010.allbits?(0b1010_1010).should == false
(0b1010_1010 | bignum_value).allbits?(0b1000_0010 | bignum_value).should == true
(0b1010_1010 | bignum_value).allbits?(0b1000_0001 | bignum_value).should == false
(0b1000_0010 | bignum_value).allbits?(0b1010_1010 | bignum_value).should == false
end
it "handles negative values using two's complement notation" do
(~0b1).allbits?(42).should == true
(-42).allbits?(-42).should == true
(~0b1010_1010).allbits?(~0b1110_1011).should == true
(~0b1010_1010).allbits?(~0b1000_0010).should == false
(~(0b1010_1010 | bignum_value)).allbits?(~(0b1110_1011 | bignum_value)).should == true
(~(0b1010_1010 | bignum_value)).allbits?(~(0b1000_0010 | 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.allbits?(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.allbits?(obj)
}.should raise_error(TypeError)
-> { 13.allbits?("10") }.should raise_error(TypeError)
-> { 13.allbits?(:symbol) }.should raise_error(TypeError)
end
end
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