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Diffstat (limited to 'spec/ruby/core/integer/bit_and_spec.rb')
-rw-r--r-- | spec/ruby/core/integer/bit_and_spec.rb | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/bit_and_spec.rb b/spec/ruby/core/integer/bit_and_spec.rb new file mode 100644 index 0000000000..75cd561e42 --- /dev/null +++ b/spec/ruby/core/integer/bit_and_spec.rb @@ -0,0 +1,97 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +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 + 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 + + 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 + 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 +end |