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require File.expand_path('../../../spec_helper', __FILE__)
describe "Bignum#^" do
before(:each) do
@bignum = bignum_value(18)
end
it "returns self bitwise EXCLUSIVE OR other" do
(@bignum ^ 2).should == 9223372036854775824
(@bignum ^ @bignum).should == 0
(@bignum ^ 14).should == 9223372036854775836
end
it "returns self bitwise EXCLUSIVE OR other when one operand is negative" do
(@bignum ^ -0x40000000000000000).should == -64563604257983430638
(@bignum ^ -@bignum).should == -4
(@bignum ^ -0x8000000000000000).should == -18446744073709551598
end
it "returns self bitwise EXCLUSIVE OR other when both operands are negative" do
(-@bignum ^ -0x40000000000000000).should == 64563604257983430638
(-@bignum ^ -@bignum).should == 0
(-@bignum ^ -0x4000000000000000).should == 13835058055282163694
end
it "returns self bitwise EXCLUSIVE OR other when all bits are 1 and other value is negative" do
(9903520314283042199192993791 ^ -1).should == -9903520314283042199192993792
(784637716923335095479473677900958302012794430558004314111 ^ -1).should ==
-784637716923335095479473677900958302012794430558004314112
end
ruby_version_is ""..."1.9" do
it "coerces Float arguments into Integers" do
(@bignum ^ 14.5).should == 9223372036854775836
(bignum_value ^ bignum_value(0xffff).to_f).should == 65536
end
end
ruby_version_is "1.9" do
it "raises a TypeError when passed a Float" do
lambda { @bignum ^ 14.5 }.should raise_error(TypeError)
lambda {
bignum_value ^ bignum_value(0xffff).to_f
}.should raise_error(TypeError)
end
end
ruby_version_is ""..."1.9.4" do
it "calls #to_int to convert an object to an Integer" do
obj = mock("bignum bit xor")
obj.should_receive(:to_int).and_return(2)
(@bignum ^ obj).should == 9223372036854775824
end
it "raises a TypeError if #to_int does not return an Integer" do
obj = mock("bignum bit xor")
obj.should_receive(:to_int).and_return("3")
lambda { @bignum ^ obj }.should raise_error(TypeError)
end
it "raises a TypeError if the object does not respond to #to_int" do
obj = mock("bignum bit xor")
lambda { @bignum ^ obj }.should raise_error(TypeError)
end
end
ruby_version_is "1.9.4" do
it "raises a TypeError and does not call #to_int when defined on an object" do
obj = mock("bignum bit xor")
obj.should_not_receive(:to_int)
lambda { @bignum ^ obj }.should raise_error(TypeError)
end
end
end
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