Avoid redefining classes between tests.

Defining classes within tests pollutes other namespaces, causing
warnings that classes are being redefined when running tests. This
change creates anonymous classes for use within individual tests.

spec/httparty/parser_spec.rb

@@ -27,10 +27,10 @@ RSpec.describe HTTParty::Parser do
     end
 
     it "returns the SupportedFormats constant for subclasses" do
-      class MyParser < HTTParty::Parser
-        SupportedFormats = {"application/atom+xml" => :atom}
-      end
-      expect(MyParser.formats).to eq({"application/atom+xml" => :atom})
+      klass = Class.new(HTTParty::Parser)
+      klass::SupportedFormats = { "application/atom+xml" => :atom }
+
+      expect(klass.formats).to eq({"application/atom+xml" => :atom})
     end
   end
 

spec/httparty/request_spec.rb

@@ -591,7 +591,7 @@ RSpec.describe HTTParty::Request do
           stub_request(:get, 'http://api.foo.com/v2')
             .to_return(body: '<hash><foo>bar</foo></hash>')
           body = ""
-          response = @request.perform { |chunk| body += chunk }
+          @request.perform { |chunk| body += chunk }
           expect(body.length).to eq(27)
         end
 

spec/httparty_spec.rb

@@ -358,11 +358,12 @@ RSpec.describe HTTParty do
 
     it "raises UnsupportedFormat when the parser cannot handle the format" do
       @klass.format :json
-      class MyParser < HTTParty::Parser
-        SupportedFormats = {}
-      end unless defined?(MyParser)
+
+      parser_class = Class.new(HTTParty::Parser)
+      parser_class::SupportedFormats = {}
+
       expect do
-        @klass.parser MyParser
+        @klass.parser parser_class
       end.to raise_error(HTTParty::UnsupportedFormat)
     end