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require_relative '../../../spec_helper'
ruby_version_is "3.2" do
describe "Enumerator::Product#size" do
it "returns the total size of the enumerator product calculated by multiplying the sizes of enumerables in the product" do
product = Enumerator::Product.new(1..2, 1..3, 1..4)
product.size.should == 24 # 2 * 3 * 4
end
it "returns nil if any enumerable reports its size as nil" do
enum = Object.new
def enum.size; nil; end
product = Enumerator::Product.new(1..2, enum)
product.size.should == nil
end
it "returns Float::INFINITY if any enumerable reports its size as Float::INFINITY" do
enum = Object.new
def enum.size; Float::INFINITY; end
product = Enumerator::Product.new(1..2, enum)
product.size.should == Float::INFINITY
end
it "returns nil if any enumerable reports its size as Float::NAN" do
enum = Object.new
def enum.size; Float::NAN; end
product = Enumerator::Product.new(1..2, enum)
product.size.should == nil
end
it "returns nil if any enumerable doesn't respond to #size" do
enum = Object.new
product = Enumerator::Product.new(1..2, enum)
product.size.should == nil
end
it "returns nil if any enumerable reports a not-convertible to Integer" do
enum = Object.new
def enum.size; :symbol; end
product = Enumerator::Product.new(1..2, enum)
product.size.should == nil
end
it "returns nil if any enumerable reports a non-Integer but convertible to Integer size" do
enum = Object.new
def enum.size; 1.0; end
product = Enumerator::Product.new(1..2, enum)
product.size.should == nil
end
end
end
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