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require_relative '../../spec_helper'
describe "Integer#lcm" do
it "returns self if equal to the argument" do
1.lcm(1).should == 1
398.lcm(398).should == 398
end
it "returns an Integer" do
36.lcm(6).should be_kind_of(Integer)
4.lcm(20981).should be_kind_of(Integer)
end
it "returns the least common multiple of self and argument" do
200.lcm(2001).should == 400200
99.lcm(90).should == 990
end
it "returns a positive integer even if self is negative" do
-12.lcm(6).should == 12
-100.lcm(100).should == 100
end
it "returns a positive integer even if the argument is negative" do
12.lcm(-6).should == 12
100.lcm(-100).should == 100
end
it "returns a positive integer even if both self and argument are negative" do
-12.lcm(-6).should == 12
-100.lcm(-100).should == 100
end
it "accepts a Bignum argument" do
bignum = 9999**99
bignum.should be_kind_of(Integer)
99.lcm(bignum).should == bignum
end
it "works if self is a Bignum" do
bignum = 9999**99
bignum.should be_kind_of(Integer)
bignum.lcm(99).should == bignum
end
it "raises an ArgumentError if not given an argument" do
-> { 12.lcm }.should raise_error(ArgumentError)
end
it "raises an ArgumentError if given more than one argument" do
-> { 12.lcm(30, 20) }.should raise_error(ArgumentError)
end
it "raises a TypeError unless the argument is an Integer" do
-> { 39.lcm(3.8) }.should raise_error(TypeError)
-> { 45872.lcm([]) }.should raise_error(TypeError)
end
end
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