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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require File.expand_path('../shared/exponent', __FILE__)
ruby_version_is "2.5" do
describe "Integer#pow" do
context "one argument is passed" do
it_behaves_like :integer_exponent, :pow
end
context "two arguments are passed" do
it "returns modulo of self raised to the given power" do
2.pow(5, 12).should == 8
2.pow(6, 13).should == 12
2.pow(7, 14).should == 2
2.pow(8, 15).should == 1
end
ruby_bug '#13669', '2.5'...'2.5.1' do
it "works well with bignums" do
2.pow(61, 5843009213693951).should eql 3697379018277258
2.pow(62, 5843009213693952).should eql 1551748822859776
2.pow(63, 5843009213693953).should eql 3103497645717974
2.pow(64, 5843009213693954).should eql 363986077738838
end
end
it "handles sign like #divmod does" do
2.pow(5, 12).should == 8
2.pow(5, -12).should == -4
-2.pow(5, 12).should == 4
-2.pow(5, -12).should == -8
end
it "ensures all arguments are integers" do
-> { 2.pow(5, 12.0) }.should raise_error(TypeError, /2nd argument not allowed unless all arguments are integers/)
-> { 2.pow(5, Rational(12, 1)) }.should raise_error(TypeError, /2nd argument not allowed unless all arguments are integers/)
end
it "raises TypeError for non-numeric value" do
-> { 2.pow(5, "12") }.should raise_error(TypeError)
-> { 2.pow(5, []) }.should raise_error(TypeError)
-> { 2.pow(5, nil) }.should raise_error(TypeError)
end
it "raises a ZeroDivisionError when the given argument is 0" do
-> { 2.pow(5, 0) }.should raise_error(ZeroDivisionError)
end
end
end
end
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