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require File.expand_path('../../../spec_helper', __FILE__)
describe "Bignum#&" do
before :each do
@bignum = bignum_value(5)
end
it "returns self bitwise AND other" do
@bignum = bignum_value(5)
(@bignum & 3).should == 1
(@bignum & 52).should == 4
(@bignum & bignum_value(9921)).should == 9223372036854775809
((2*bignum_value) & 1).should == 0
((2*bignum_value) & (2*bignum_value)).should == 18446744073709551616
end
it "returns self bitwise AND other when one operand is negative" do
((2*bignum_value) & -1).should == 18446744073709551616
((4*bignum_value) & -1).should == 36893488147419103232
(@bignum & -0xffffffffffffff5).should == 9223372036854775809
(@bignum & -@bignum).should == 1
(@bignum & -0x8000000000000000).should == 9223372036854775808
end
it "returns self bitwise AND other when both operands are negative" do
(-@bignum & -0x4000000000000005).should == -13835058055282163717
(-@bignum & -@bignum).should == -9223372036854775813
(-@bignum & -0x4000000000000000).should == -13835058055282163712
end
it "returns self bitwise AND other when both are negative and a multiple in bitsize of Fixnum::MIN" do
val = - ((1 << 93) - 1)
(val & val).should == val
val = - ((1 << 126) - 1)
(val & val).should == val
end
it "raises a TypeError when passed a Float" do
lambda { (@bignum & 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("bignum bit and")
obj.should_not_receive(:to_int)
lambda { @bignum & obj }.should raise_error(TypeError)
end
end
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