```ruby
require File.expand_path('../../../spec_helper', __FILE__)

ruby_version_is "2.0" do
  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

      (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 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 nil if first and last are not Numeric" do
      (:a..:z).size.should be_nil
      ('a'..'z').size.should be_nil
    end
  end
end
```

Move infinite range expectations to their own example
user
```ruby
require File.expand_path('../../../spec_helper', __FILE__)

ruby_version_is "2.0" do
  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 nil if first and last are not Numeric" do
      (:a..:z).size.should be_nil
      ('a'..'z').size.should be_nil
    end
  end
end
```
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