diff --git a/Gemfile.lock b/Gemfile.lock
index 7d9a780..28bb06a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    absmartly-sdk (1.0.6)
+    absmartly-sdk (1.0.7)
       arraybuffer (~> 0.0.6)
       faraday (~> 1.10.3)
       murmurhash3 (~> 0.1.7)
diff --git a/lib/absmartly/version.rb b/lib/absmartly/version.rb
index 3fac81d..130661d 100644
--- a/lib/absmartly/version.rb
+++ b/lib/absmartly/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Absmartly
-  VERSION = "1.0.6"
+  VERSION = "1.0.7"
 end
diff --git a/lib/json/attribute.rb b/lib/json/attribute.rb
index 977e4a3..2cf8ab4 100644
--- a/lib/json/attribute.rb
+++ b/lib/json/attribute.rb
@@ -22,9 +22,9 @@ def hash_code
 
   def to_s
     "Attribute{" +
-      "name='" + @name + "'" +
-      ", value=" + @value +
-      ", setAt=" + @set_at +
+      "name='#{@name}'" +
+      ", value=#{@value}" +
+      ", setAt=#{@set_at}" +
       "}"
   end
 end
diff --git a/lib/json/experiment.rb b/lib/json/experiment.rb
index c83fe9b..35d43d5 100644
--- a/lib/json/experiment.rb
+++ b/lib/json/experiment.rb
@@ -63,21 +63,21 @@ def hash_code
 
   def to_s
     "ContextExperiment{" +
-      "id=" + @id +
-      ", name='" + @name + "'" +
-      ", unitType='" + @unit_type + "'" +
-      ", iteration=" + @iteration +
-      ", seedHi=" + @seed_hi +
-      ", seedLo=" + @seed_lo +
-      ", split=" + @split.join +
-      ", trafficSeedHi=" + @traffic_seed_hi +
-      ", trafficSeedLo=" + @traffic_seed_lo +
-      ", trafficSplit=" + @traffic_split.join +
-      ", fullOnVariant=" + @full_on_variant +
-      ", applications=" + @applications.join +
-      ", variants=" + @variants.join +
-      ", audienceStrict=" + @audience_strict +
-      ", audience='" + @audience + "'" +
+      "id= #{@id}"+
+      ", name='#{@name}'" +
+      ", unitType='#{@unit_type}'" +
+      ", iteration=#{@iteration}" +
+      ", seedHi=#{@seed_hi}" +
+      ", seedLo=#{@seed_lo}" +
+      ", split=#{@split.join}" +
+      ", trafficSeedHi=#{@traffic_seed_hi}" +
+      ", trafficSeedLo=#{@traffic_seed_lo}" +
+      ", trafficSplit=#{@traffic_split.join}" +
+      ", fullOnVariant=#{@full_on_variant}" +
+      ", applications=#{@applications.join}" +
+      ", variants=#{@variants.join}" +
+      ", audienceStrict=#{@audience_strict}" +
+      ", audience='#{@audience}'" +
       "}"
   end
 end
diff --git a/lib/json/experiment_variant.rb b/lib/json/experiment_variant.rb
index cc91510..b833280 100644
--- a/lib/json/experiment_variant.rb
+++ b/lib/json/experiment_variant.rb
@@ -22,8 +22,8 @@ def hash_code
 
   def to_s
     "ExperimentVariant{" +
-      "name='" + @name + "'" +
-      ", config='" + @config + "'" +
+      "name='#{@name}'" +
+      ", config='#{@config}'" +
       "}"
   end
 end
diff --git a/lib/json/exposure.rb b/lib/json/exposure.rb
index a2bb683..69eadfe 100644
--- a/lib/json/exposure.rb
+++ b/lib/json/exposure.rb
@@ -44,17 +44,17 @@ def hash_code
 
   def to_s
     "Exposure{" +
-      "id=" + @id +
-      "name='" + @name + "'" +
-      ", unit=" + @unit +
-      ", variant=" + @variant +
-      ", exposed_at=" + @exposed_at +
-      ", assigned=" + @assigned +
-      ", eligible=" + @eligible +
-      ", overridden=" + @overridden +
-      ", full_on=" + @full_on +
-      ", custom=" + @custom +
-      ", audience_mismatch=" + @audience_mismatch +
+      "id=#{@id}" +
+      "name='#{@name}'" +
+      ", unit=#{@unit}" +
+      ", variant=#{@variant}" +
+      ", exposed_at=#{@exposed_at}" +
+      ", assigned=#{@assigned}" +
+      ", eligible=#{@eligible}" +
+      ", overridden=#{@overridden}" +
+      ", full_on=#{@full_on}" +
+      ", custom=#{@custom}" +
+      ", audience_mismatch=#{@audience_mismatch}" +
       "}"
   end
 end
diff --git a/lib/json/goal_achievement.rb b/lib/json/goal_achievement.rb
index 8e0ac10..97a3240 100644
--- a/lib/json/goal_achievement.rb
+++ b/lib/json/goal_achievement.rb
@@ -24,9 +24,9 @@ def hash_code
 
   def to_s
     "GoalAchievement{" +
-      "name='" + @name + "'" +
-      ", achieved_at='" + @achieved_at + "'" +
-      ", properties='" + @properties.inspect + "'" +
+      "name='#{@name}'" +
+      ", achieved_at='#{@achieved_at}'" +
+      ", properties='#{@properties.inspect}'" +
       "}"
   end
 end
diff --git a/lib/json/publish_event.rb b/lib/json/publish_event.rb
index 2caae04..b765cde 100644
--- a/lib/json/publish_event.rb
+++ b/lib/json/publish_event.rb
@@ -31,12 +31,12 @@ def hash_code
 
   def to_s
     "PublishEvent{" +
-      "hashedUnits=" + @hashed +
-      ", units=" + @units.inspect +
-      ", publishedAt=" + @published_at +
-      ", exposures=" + @exposures.inspect +
-      ", goals=" + @goals.inspect +
-      ", attributes=" + @attributes.join +
+      "hashedUnits=#{@hashed}" +
+      ", units=#{@units.inspect}" +
+      ", publishedAt=#{@published_at}" +
+      ", exposures=#{@exposures.inspect}" +
+      ", goals=#{@goals.inspect}" +
+      ", attributes=#{@attributes!=nil ? @attributes.join : ""}" +
       "}"
   end
 end
diff --git a/spec/context_spec.rb b/spec/context_spec.rb
index ad81b10..8542af6 100644
--- a/spec/context_spec.rb
+++ b/spec/context_spec.rb
@@ -12,6 +12,7 @@
 require "scheduled_executor_service"
 require "audience_matcher"
 require "json/unit"
+require "logger"
 
 RSpec.describe Context do
   let(:units) {
@@ -106,7 +107,7 @@
   end
   let(:event_logger) do
     event_logger = MockContextEventLoggerProxy.new
-    allow(event_logger).to receive(:handle_event).and_return(nil)
+    allow(event_logger).to receive(:handle_event).and_call_original
     event_logger
   end
   let(:variable_parser) { DefaultVariableParser.new }
@@ -1081,16 +1082,20 @@ def faraday_response(content)
 
 
 class MockContextEventLoggerProxy < ContextEventLogger
-  attr_accessor :called, :events
+  attr_accessor :called, :events, :logger
 
   def initialize
     @called = 0
     @events = []
+    @logger = Logger.new(STDOUT)
   end
 
   def handle_event(event, data)
     @called += 1
     @events << { event: event, data: data }
+
+    @logger.debug "event: #{event}"
+    @logger.debug "data: #{data}"
   end
 
   def clear