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require_relative '../../spec_helper'
describe "Range#size" do
it "returns the number of elements in the range" do
(1..16).size.should == 16
(1...16).size.should == 15
(1.0..16.0).size.should == 16
(1.0...16.0).size.should == 15
(1.0..15.9).size.should == 15
(1.1..16.0).size.should == 15
(1.1..15.9).size.should == 15
end
it "returns 0 if last is less than first" do
(16..0).size.should == 0
(16.0..0.0).size.should == 0
(Float::INFINITY..0).size.should == 0
end
it 'returns Float::INFINITY for increasing, infinite ranges' do
(0..Float::INFINITY).size.should == Float::INFINITY
(-Float::INFINITY..0).size.should == Float::INFINITY
(-Float::INFINITY..Float::INFINITY).size.should == Float::INFINITY
end
it 'returns Float::INFINITY for endless ranges if the start is numeric' do
eval("(1..)").size.should == Float::INFINITY
eval("(0.5...)").size.should == Float::INFINITY
end
it 'returns nil for endless ranges if the start is not numeric' do
eval("('z'..)").size.should == nil
eval("([]...)").size.should == nil
end
ruby_version_is "2.7" do
it 'returns Float::INFINITY for all beginless ranges' do
eval("(..1)").size.should == Float::INFINITY
eval("(...0.5)").size.should == Float::INFINITY
eval("(..nil)").size.should == Float::INFINITY
eval("(...'o')").size.should == Float::INFINITY
end
end
it "returns nil if first and last are not Numeric" do
(:a..:z).size.should be_nil
('a'..'z').size.should be_nil
end
end
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