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require File.expand_path('../../../spec_helper', __FILE__)
describe "Fixnum#&" do
it "returns self bitwise AND other" do
(256 & 16).should == 0
(2010 & 5).should == 0
(65535 & 1).should == 1
(0xffff & bignum_value + 0xffff_ffff).should == 65535
end
it "returns self bitwise AND other when one operand is negative" do
((1 << 33) & -1).should == (1 << 33)
(-1 & (1 << 33)).should == (1 << 33)
((-(1<<33)-1) & 5).should == 5
(5 & (-(1<<33)-1)).should == 5
end
it "returns self bitwise AND other when both operands are negative" do
(-5 & -1).should == -5
(-3 & -4).should == -4
(-12 & -13).should == -16
(-13 & -12).should == -16
end
it "returns self bitwise AND a Bignum" do
(-1 & 2**64).should == 18446744073709551616
end
it "raises a TypeError when passed a Float" do
lambda { (3 & 3.4) }.should raise_error(TypeError)
end
it "raises a TypeError and does not call #to_int when defined on an object" do
obj = mock("fixnum bit and")
obj.should_not_receive(:to_int)
lambda { 3 & obj }.should raise_error(TypeError)
end
end
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