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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
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