diff options
Diffstat (limited to 'spec/ruby/core/integer/lcm_spec.rb')
-rw-r--r-- | spec/ruby/core/integer/lcm_spec.rb | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/lcm_spec.rb b/spec/ruby/core/integer/lcm_spec.rb new file mode 100644 index 0000000000..ddf25d3853 --- /dev/null +++ b/spec/ruby/core/integer/lcm_spec.rb @@ -0,0 +1,58 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +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(Bignum) + 99.lcm(bignum).should == bignum + end + + it "works if self is a Bignum" do + bignum = 9999**99 + bignum.should be_kind_of(Bignum) + bignum.lcm(99).should == bignum + end + + it "raises an ArgumentError if not given an argument" do + lambda { 12.lcm }.should raise_error(ArgumentError) + end + + it "raises an ArgumentError if given more than one argument" do + lambda { 12.lcm(30, 20) }.should raise_error(ArgumentError) + end + + it "raises a TypeError unless the argument is an Integer" do + lambda { 39.lcm(3.8) }.should raise_error(TypeError) + lambda { 45872.lcm([]) }.should raise_error(TypeError) + end +end |