Fix uninitialized ivar warnings.

lib/vcr/extensions/net_http_response.rb

@@ -12,6 +12,10 @@
 module VCR
   module Net
     module HTTPResponse
+      def self.extended(response)
+        response.instance_variable_set(:@__read_body_previously_called, false)
+      end
+
       def read_body(dest = nil, &block)
         return super if @__read_body_previously_called
         return @body if dest.nil? && block.nil?

lib/vcr/http_stubbing_adapters/common.rb

@@ -75,7 +75,7 @@ def raise_no_checkpoint_error(cassette)
       attr_writer :http_connections_allowed
 
       def http_connections_allowed?
-        !!@http_connections_allowed
+        defined?(@http_connections_allowed) && !!@http_connections_allowed
       end
 
       def ignored_hosts=(hosts)

lib/vcr/http_stubbing_adapters/fakeweb.rb

@@ -93,6 +93,12 @@ def validate_match_attributes(match_attributes)
           raise UnsupportedRequestMatchAttributeError.new("FakeWeb does not support matching requests on #{invalid_attributes.join(' or ')}")
         end
       end
+
+      def initialize_ivars
+        @http_connections_allowed = nil
+      end
+
+      initialize_ivars # to avoid warnings
     end
   end
 end

spec/vcr/extensions/net_http_response_spec.rb

@@ -45,7 +45,7 @@ def self.it_allows_the_body_to_be_read(expected_regex)
       let(:http_verb_method) { :"request_#{http_verb}" }
 
       def response(&block)
-        if @response && block
+        if defined?(@response) && block
           block.call(@response)
           return @response
         end