Instantiates variables used during test execution.

Rspec complains when using non-instantiated instance variables in tests,
even if they're not critical to the purpose of the test. This change
ensures all instance variables used in, or executing during, tests have
values.

spec/httparty/connection_adapter_spec.rb

@@ -32,9 +32,12 @@ RSpec.describe HTTParty::ConnectionAdapter do
   end
 
   describe ".call" do
+    let(:uri) { URI 'http://www.google.com' }
+    let(:options) { { foo: :bar } }
+
     it "generates an HTTParty::ConnectionAdapter instance with the given uri and options" do
-      expect(HTTParty::ConnectionAdapter).to receive(:new).with(@uri, @options).and_return(double(connection: nil))
-      HTTParty::ConnectionAdapter.call(@uri, @options)
+      expect(HTTParty::ConnectionAdapter).to receive(:new).with(uri, options).and_return(double(connection: nil))
+      HTTParty::ConnectionAdapter.call(uri, options)
     end
 
     it "calls #connection on the connection adapter" do
@@ -42,7 +45,7 @@ RSpec.describe HTTParty::ConnectionAdapter do
       connection = double('Connection')
       expect(adapter).to receive(:connection).and_return(connection)
       allow(HTTParty::ConnectionAdapter).to receive_messages(new: adapter)
-      expect(HTTParty::ConnectionAdapter.call(@uri, @options)).to be connection
+      expect(HTTParty::ConnectionAdapter.call(uri, options)).to be connection
     end
   end
 

spec/httparty/net_digest_auth_spec.rb

@@ -23,6 +23,8 @@ RSpec.describe Net::HTTPHeader::DigestAuthenticator do
         include Net::HTTPHeader
         def initialize
           @header = {}
+          @path = '/'
+          @method = 'GET'
         end
       end).new
     }