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require_relative '../../spec_helper'
describe "Integer#&" do
context "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 "coerces the rhs and calls #coerce" do
obj = mock("fixnum bit and")
obj.should_receive(:coerce).with(6).and_return([3, 6])
(6 & obj).should == 2
end
it "raises a TypeError when passed a Float" do
-> { (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)
-> { 3 & obj }.should raise_error(TypeError)
end
end
context "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 == (2*bignum_value)
((4*bignum_value) & -1).should == (4*bignum_value)
(@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
-> { (@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)
-> { @bignum & obj }.should raise_error(TypeError)
end
end
end
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