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Diffstat (limited to 'spec/ruby/core/integer/downto_spec.rb')
-rw-r--r-- | spec/ruby/core/integer/downto_spec.rb | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/downto_spec.rb b/spec/ruby/core/integer/downto_spec.rb new file mode 100644 index 0000000000..6b7b353760 --- /dev/null +++ b/spec/ruby/core/integer/downto_spec.rb @@ -0,0 +1,69 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +describe "Integer#downto [stop] when self and stop are Fixnums" do + it "does not yield when stop is greater than self" do + result = [] + 5.downto(6) { |x| result << x } + result.should == [] + end + + it "yields once when stop equals self" do + result = [] + 5.downto(5) { |x| result << x } + result.should == [5] + end + + it "yields while decreasing self until it is less than stop" do + result = [] + 5.downto(2) { |x| result << x } + result.should == [5, 4, 3, 2] + end + + it "yields while decreasing self until it less than ceil for a Float endpoint" do + result = [] + 9.downto(1.3) {|i| result << i} + 3.downto(-1.3) {|i| result << i} + result.should == [9, 8, 7, 6, 5, 4, 3, 2, 3, 2, 1, 0, -1] + end + + it "raises an ArgumentError for invalid endpoints" do + lambda {1.downto("A") {|x| p x } }.should raise_error(ArgumentError) + lambda {1.downto(nil) {|x| p x } }.should raise_error(ArgumentError) + end + + describe "when no block is given" do + it "returns an Enumerator" do + result = [] + + enum = 5.downto(2) + enum.each { |i| result << i } + + result.should == [5, 4, 3, 2] + end + + describe "returned Enumerator" do + describe "size" do + it "raises an ArgumentError for invalid endpoints" do + enum = 1.downto("A") + lambda { enum.size }.should raise_error(ArgumentError) + enum = 1.downto(nil) + lambda { enum.size }.should raise_error(ArgumentError) + end + + it "returns self - stop + 1" do + 10.downto(5).size.should == 6 + 10.downto(1).size.should == 10 + 10.downto(0).size.should == 11 + 0.downto(0).size.should == 1 + -3.downto(-5).size.should == 3 + end + + it "returns 0 when stop > self" do + 4.downto(5).size.should == 0 + -5.downto(0).size.should == 0 + -5.downto(-3).size.should == 0 + end + end + end + end +end |