Tidy up jsonize_spec

Author: cltweedie

spec/bitbucket_rest_api/request/jsonize_spec.rb

@@ -1,9 +1,8 @@
 require 'spec_helper'
 
 describe BitBucket::Request::Jsonize do
-  let(:jsonize) { described_class.new }
+  let(:jsonize) { described_class.new(lambda { |env| env }) }
   before do
-    @jsonize = BitBucket::Request::Jsonize.new(lambda { |env| env })
     @env = {
       body: {key1: 'val1'},
       request_headers: {
@@ -14,6 +13,6 @@
 
   it "converts the body to json" do
     expected = {body: "{\"key1\":\"val1\"}", request_headers: {"Content-Type"=>"application/json; charset=utf-8"}}
-    expect(@jsonize.call(@env)).to eq expected
+    expect(jsonize.call(@env)).to eq expected
   end
 end