2018-03-04 10:09:32 -05:00
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require_relative '../../spec_helper'
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2017-05-07 08:04:49 -04:00
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describe "Integer#lcm" do
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it "returns self if equal to the argument" do
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1.lcm(1).should == 1
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398.lcm(398).should == 398
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end
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it "returns an Integer" do
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36.lcm(6).should be_kind_of(Integer)
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4.lcm(20981).should be_kind_of(Integer)
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end
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it "returns the least common multiple of self and argument" do
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200.lcm(2001).should == 400200
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99.lcm(90).should == 990
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end
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it "returns a positive integer even if self is negative" do
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-12.lcm(6).should == 12
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-100.lcm(100).should == 100
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end
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it "returns a positive integer even if the argument is negative" do
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12.lcm(-6).should == 12
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100.lcm(-100).should == 100
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end
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it "returns a positive integer even if both self and argument are negative" do
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-12.lcm(-6).should == 12
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-100.lcm(-100).should == 100
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end
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2020-12-27 11:35:32 -05:00
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it "accepts a Bignum argument" do
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bignum = 9999**99
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bignum.should be_kind_of(Integer)
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99.lcm(bignum).should == bignum
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end
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2020-12-27 11:35:32 -05:00
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it "works if self is a Bignum" do
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bignum = 9999**99
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2020-12-20 11:16:26 -05:00
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bignum.should be_kind_of(Integer)
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bignum.lcm(99).should == bignum
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end
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it "raises an ArgumentError if not given an argument" do
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-> { 12.lcm }.should raise_error(ArgumentError)
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end
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it "raises an ArgumentError if given more than one argument" do
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-> { 12.lcm(30, 20) }.should raise_error(ArgumentError)
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end
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it "raises a TypeError unless the argument is an Integer" do
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2019-07-27 06:40:09 -04:00
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-> { 39.lcm(3.8) }.should raise_error(TypeError)
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-> { 45872.lcm([]) }.should raise_error(TypeError)
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2017-05-07 08:04:49 -04:00
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end
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end
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