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1d15d5f080
* Other ruby implementations use the spec/ruby directory. [Misc #13792] [ruby-core:82287] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
76 lines
2.3 KiB
Ruby
76 lines
2.3 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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describe "Fixnum#**" do
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it "returns self raised to the given power" do
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(2 ** 0).should eql 1
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(2 ** 1).should eql 2
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(2 ** 2).should eql 4
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(9 ** 0.5).should eql 3.0
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(5 ** -1).to_f.to_s.should == '0.2'
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(2 ** 40).should eql 1099511627776
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end
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it "overflows the answer to a bignum transparantly" do
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(2 ** 29).should eql 536870912
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(2 ** 30).should eql 1073741824
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(2 ** 31).should eql 2147483648
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(2 ** 32).should eql 4294967296
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(2 ** 61).should eql 2305843009213693952
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(2 ** 62).should eql 4611686018427387904
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(2 ** 63).should eql 9223372036854775808
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(2 ** 64).should eql 18446744073709551616
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(8 ** 23).should eql 590295810358705651712
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end
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it "raises negative numbers to the given power" do
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((-2) ** 29).should eql(-536870912)
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((-2) ** 30).should eql(1073741824)
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((-2) ** 31).should eql(-2147483648)
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((-2) ** 32).should eql(4294967296)
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((-2) ** 61).should eql(-2305843009213693952)
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((-2) ** 62).should eql(4611686018427387904)
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((-2) ** 63).should eql(-9223372036854775808)
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((-2) ** 64).should eql(18446744073709551616)
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end
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it "can raise 1 to a Bignum safely" do
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big = bignum_value(4611686018427387904)
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(1 ** big).should eql 1
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end
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it "can raise -1 to a Bignum safely" do
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((-1) ** bignum_value(0)).should eql(1)
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((-1) ** bignum_value(1)).should eql(-1)
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end
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it "switches to a Float when the number is too big" do
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big = bignum_value(4611686018427387904)
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flt = (2 ** big)
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flt.should be_kind_of(Float)
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flt.infinite?.should == 1
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end
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conflicts_with :Rational do
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it "raises a ZeroDivisionError for 0**-1" do
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lambda { (0**-1) }.should raise_error(ZeroDivisionError)
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end
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it "raises a TypeError when given a non-Integer" do
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lambda {
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(obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
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13 ** obj
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}.should raise_error(TypeError)
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lambda { 13 ** "10" }.should raise_error(TypeError)
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lambda { 13 ** :symbol }.should raise_error(TypeError)
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end
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end
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it "returns a complex number when negative and raised to a fractional power" do
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((-8) ** (1.0/3)) .should be_close(Complex(1, 1.73205), TOLERANCE)
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((-8) ** Rational(1,3)).should be_close(Complex(1, 1.73205), TOLERANCE)
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end
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end
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