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Diffstat (limited to 'spec/ruby/core/integer/upto_spec.rb')
-rw-r--r-- | spec/ruby/core/integer/upto_spec.rb | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/upto_spec.rb b/spec/ruby/core/integer/upto_spec.rb new file mode 100644 index 0000000000..405f8e4817 --- /dev/null +++ b/spec/ruby/core/integer/upto_spec.rb @@ -0,0 +1,69 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +describe "Integer#upto [stop] when self and stop are Fixnums" do + it "does not yield when stop is less than self" do + result = [] + 5.upto(4) { |x| result << x } + result.should == [] + end + + it "yields once when stop equals self" do + result = [] + 5.upto(5) { |x| result << x } + result.should == [5] + end + + it "yields while increasing self until it is less than stop" do + result = [] + 2.upto(5) { |x| result << x } + result.should == [2, 3, 4, 5] + end + + it "yields while increasing self until it is greater than floor of a Float endpoint" do + result = [] + 9.upto(13.3) {|i| result << i} + -5.upto(-1.3) {|i| result << i} + result.should == [9,10,11,12,13,-5,-4,-3,-2] + end + + it "raises an ArgumentError for non-numeric endpoints" do + lambda { 1.upto("A") {|x| p x} }.should raise_error(ArgumentError) + lambda { 1.upto(nil) {|x| p x} }.should raise_error(ArgumentError) + end + + describe "when no block is given" do + it "returns an Enumerator" do + result = [] + + enum = 2.upto(5) + enum.each { |i| result << i } + + result.should == [2, 3, 4, 5] + end + + describe "returned Enumerator" do + describe "size" do + it "raises an ArgumentError for non-numeric endpoints" do + enum = 1.upto("A") + lambda { enum.size }.should raise_error(ArgumentError) + enum = 1.upto(nil) + lambda { enum.size }.should raise_error(ArgumentError) + end + + it "returns stop - self + 1" do + 5.upto(10).size.should == 6 + 1.upto(10).size.should == 10 + 0.upto(10).size.should == 11 + 0.upto(0).size.should == 1 + -5.upto(-3).size.should == 3 + end + + it "returns 0 when stop < self" do + 5.upto(4).size.should == 0 + 0.upto(-5).size.should == 0 + -3.upto(-5).size.should == 0 + end + end + end + end +end |