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require File.expand_path('../../../spec_helper', __FILE__)
describe "Fixnum#*" do
it "returns self multiplied by the given Integer" do
(4923 * 2).should == 9846
(1342177 * 800).should == 1073741600
(65536 * 65536).should == 4294967296
(256 * bignum_value).should == 2361183241434822606848
(6712 * 0.25).should == 1678.0
end
it "raises a TypeError when given a non-Integer" do
lambda {
(obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
13 * obj
}.should raise_error(TypeError)
lambda { 13 * "10" }.should raise_error(TypeError)
lambda { 13 * :symbol }.should raise_error(TypeError)
end
it "overflows to Bignum when the result does not fit in Fixnum" do
if 1.size == 4
# 32-bit fixnums
y = 0x4000
result = y * y * y
result.should == 0x40000000000
result.should be_kind_of(Bignum)
elsif 1.size == 8
# 64-bit fixnums
y = 0x40000000
result = y * y * y
result.should == 0x40000000000000000000000
result.should be_kind_of(Bignum)
end
end
end
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