Minor fixes after review

Fixes #1758

spec/core/conditionals_spec.rb

@@ -22,7 +22,6 @@ module ConditionalFanciness
 end
 
 describe "conditionals in output" do
-  extend LogStash::RSpec
   extend ConditionalFanciness
 
   describe "simple" do

spec/logstash_helpers.rb

@@ -14,7 +14,7 @@ module LogStashHelper
 
   def tags(*tags)
     let(:default_tags) { tags }
-    puts "Setting default tags: #{@default_tags}"
+    puts "Setting default tags: #{tags}"
   end
 
   def sample(sample_event, &block)

spec/util/json_spec.rb

@@ -42,17 +42,17 @@ describe LogStash::Json do
 
     context "jruby serialize" do
       it "should respond to dump and serialize object" do
-expect(JrJackson::Json).to receive(:dump).with(string).and_call_original
+        expect(JrJackson::Json).to receive(:dump).with(string).and_call_original
         expect(LogStash::Json.dump(string)).to eql(json_string)
       end
 
       it "should call JrJackson::Raw.generate for Hash" do
-#expect(JrJackson::Raw).to receive(:generate).with(hash).and_call_original
+        expect(JrJackson::Raw).to receive(:generate).with(hash).and_call_original
         expect(LogStash::Json.dump(hash)).to eql(json_hash)
       end
 
       it "should call JrJackson::Raw.generate for Array" do
-#expect(JrJackson::Raw).to receive(:generate).with(array).and_call_original
+        expect(JrJackson::Raw).to receive(:generate).with(array).and_call_original
         expect(LogStash::Json.dump(array)).to eql(json_array)
       end