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require File.expand_path('../../../spec_helper', __FILE__)
describe "Bignum#**" do
before(:each) do
@bignum = bignum_value(47)
end
it "returns self raised to other power" do
(@bignum ** 4).should == 7237005577332262361485077344629993318496048279512298547155833600056910050625
(@bignum ** 1.2).should be_close(57262152889751597425762.57804, TOLERANCE)
end
it "raises a TypeError when given a non-Integer" do
lambda { @bignum ** mock('10') }.should raise_error
lambda { @bignum ** "10" }.should raise_error
lambda { @bignum ** :symbol }.should raise_error
end
it "switch to a Float when the values is too big" do
flt = (@bignum ** @bignum)
flt.should be_kind_of(Float)
flt.infinite?.should == 1
end
ruby_version_is '1.9' do
it "returns a complex number when negative and raised to a fractional power" do
((-@bignum) ** (1.0/3)) .should be_close(Complex(1048576,1816186.907597341), TOLERANCE)
((-@bignum) ** Rational(1,3)).should be_close(Complex(1048576,1816186.907597341), TOLERANCE)
end
end
end
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