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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 a 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
ruby_version_is "" ... "1.8.7" do
it "does not require a block if self is less than stop" do
1.downto(2).should equal(1)
end
it "raises a LocalJumpError when no block given" do
lambda { 5.downto(2) }.should raise_error(LocalJumpError)
end
end
ruby_version_is "1.8.7" do
it "returns an Enumerator" do
result = []
enum = 5.downto(2)
enum.each { |i| result << i }
result.should == [5, 4, 3, 2]
end
end
end
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