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require File.expand_path('../../../spec_helper', __FILE__)
describe "Integer#remainder" do
context "fixnum" do
it "returns the remainder of dividing self by other" do
5.remainder(3).should == 2
5.remainder(3.0).should == 2.0
5.remainder(Rational(3, 1)).should == Rational(2, 1)
end
it "means x-y*(x/y).truncate" do
5.remainder(3).should == 2
5.remainder(3.3).should be_close(1.7, TOLERANCE)
5.remainder(3.7).should be_close(1.3, TOLERANCE)
end
it "keeps sign of self" do
5.remainder( 3).should == 2
5.remainder(-3).should == 2
-5.remainder( 3).should == -2
-5.remainder(-3).should == -2
end
it "raises TypeError if passed non-numeric argument" do
-> { 5.remainder("3") }.should raise_error(TypeError)
-> { 5.remainder(:"3") }.should raise_error(TypeError)
-> { 5.remainder([]) }.should raise_error(TypeError)
-> { 5.remainder(nil) }.should raise_error(TypeError)
end
end
context "bignum" do
it "returns the remainder of dividing self by other" do
a = bignum_value(79)
a.remainder(2).should == 1
a.remainder(97.345).should be_close(46.5674996147722, TOLERANCE)
a.remainder(bignum_value).should == 79
end
it "raises a ZeroDivisionError if other is zero and not a Float" do
lambda { bignum_value(66).remainder(0) }.should raise_error(ZeroDivisionError)
end
it "does raises ZeroDivisionError if other is zero and a Float" do
a = bignum_value(7)
b = bignum_value(32)
lambda { a.remainder(0.0) }.should raise_error(ZeroDivisionError)
lambda { b.remainder(-0.0) }.should raise_error(ZeroDivisionError)
end
end
end
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