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Contents
require File.dirname(File.join(__rhoGetCurrentDir(), __FILE__)) + '/../../spec_helper'
describe "Fixnum#<<" do
it "returns self shifted the given amount of bits to the left" do
(7 << 2).should == 28
(9 << 4).should == 144
(1 <<30).should == 1073741824
(1 <<31).should == 2147483648
(1 <<32).should == 4294967296
(-1<<31).should == -2147483648
(-1<<32).should == -4294967296
(1 <<62).should == 4611686018427387904
(1 <<63).should == 9223372036854775808
(1 <<64).should == 18446744073709551616
(-1<<63).should == -9223372036854775808
(-1<<64).should == -18446744073709551616
end
it "performs a right-shift if given a negative value" do
(7 << -2).should == (7 >> 2)
(9 << -4).should == (9 >> 4)
end
it "coerces result on overflow and return self shifted left other bits" do
(9 << 4.2).should == 144
(6 << 0xff).should == 347376267711948586270712955026063723559809953996921692118372752023739388919808
end
it "tries to convert its argument to an Integer using to_int" do
(5 << 4.3).should == 80
(obj = mock('4')).should_receive(:to_int).and_return(4)
(3 << obj).should == 48
end
it "raises a TypeError when the given argument can't be converted to Integer" do
obj = mock('asdf')
lambda { 3 << obj }.should raise_error(TypeError)
obj.should_receive(:to_int).and_return("asdf")
lambda { 3 << obj }.should raise_error(TypeError)
end
it "raises a RangeError when the given argument is out of range of Fixnum" do
(obj = mock('large value')).should_receive(:to_int).and_return(8000_0000_0000_0000_0000)
lambda { 3 << obj }.should raise_error(RangeError)
obj = 8e19
lambda { 3 << obj }.should raise_error(RangeError)
end
end
Version data entries
83 entries across 83 versions & 1 rubygems