diff --git a/source/Stargate-Consul-Tests/ConsulServiceDiscoveryPluginAPITest.class.st b/source/Stargate-Consul-Tests/ConsulServiceDiscoveryPluginAPITest.class.st
index b03a717..66227c2 100644
--- a/source/Stargate-Consul-Tests/ConsulServiceDiscoveryPluginAPITest.class.st
+++ b/source/Stargate-Consul-Tests/ConsulServiceDiscoveryPluginAPITest.class.st
@@ -2,7 +2,8 @@ Class {
 	#name : #ConsulServiceDiscoveryPluginAPITest,
 	#superclass : #OperationalPluginAPITest,
 	#instVars : [
-		'consulAgent'
+		'consulAgent',
+		'consulAgentPort'
 	],
 	#category : #'Stargate-Consul-Tests'
 }
@@ -10,7 +11,13 @@ Class {
 { #category : #private }
 ConsulServiceDiscoveryPluginAPITest >> consulAgentLocation [
 
-	^ 'http://localhost:9998' asUrl
+	^ 'http://localhost' asUrl port: consulAgentPort
+]
+
+{ #category : #logging }
+ConsulServiceDiscoveryPluginAPITest >> isLogging [
+
+	^ true
 ]
 
 { #category : #private }
@@ -32,6 +39,19 @@ ConsulServiceDiscoveryPluginAPITest >> requiredPermissions [
 	^ #()
 ]
 
+{ #category : #private }
+ConsulServiceDiscoveryPluginAPITest >> runCase [
+
+	| logs |
+
+	logs :=
+		String streamContents: [:stream |
+			CurrentLogger
+				value: (LeveledLogger outputTo: stream errorsTo: stream)
+				during: [super runCase]].
+	self logFailure: logs
+]
+
 { #category : #private }
 ConsulServiceDiscoveryPluginAPITest >> serviceDefinitions [
 
@@ -41,9 +61,10 @@ ConsulServiceDiscoveryPluginAPITest >> serviceDefinitions [
 { #category : #tests }
 ConsulServiceDiscoveryPluginAPITest >> setUp [
 
+	consulAgentPort := self freeListeningTCPPort.
 	consulAgent := FakeConsulAgentAPI
 		configuredBy:
-			{( #port -> 9998 ).
+			{( #port -> consulAgentPort ).
 			( #serverUrl -> self consulAgentLocation ).
 			( #debugMode -> true )}
 		on: self.
diff --git a/source/Stargate-Consul-Tests/ConsulServiceDiscoveryPluginInteractionTest.class.st b/source/Stargate-Consul-Tests/ConsulServiceDiscoveryPluginInteractionTest.class.st
index eda7be1..bd61bf3 100644
--- a/source/Stargate-Consul-Tests/ConsulServiceDiscoveryPluginInteractionTest.class.st
+++ b/source/Stargate-Consul-Tests/ConsulServiceDiscoveryPluginInteractionTest.class.st
@@ -2,7 +2,8 @@ Class {
 	#name : #ConsulServiceDiscoveryPluginInteractionTest,
 	#superclass : #TestCase,
 	#instVars : [
-		'consulAgent'
+		'consulAgent',
+		'port'
 	],
 	#category : #'Stargate-Consul-Tests'
 }
@@ -16,24 +17,19 @@ ConsulServiceDiscoveryPluginInteractionTest >> apiServer [
 { #category : #accessing }
 ConsulServiceDiscoveryPluginInteractionTest >> baseUrl [
 
-	^ 'http://localhost' asUrl port: self port
-]
-
-{ #category : #accessing }
-ConsulServiceDiscoveryPluginInteractionTest >> port [
-
-	^ 9998
+	^ 'http://localhost' asUrl port: port
 ]
 
 { #category : #running }
 ConsulServiceDiscoveryPluginInteractionTest >> setUp [
 
 	super setUp.
+	port := self freeListeningTCPPort.
 	consulAgent := FakeConsulAgentAPI
 		configuredBy:
-			{( #port -> self port ).
-			( #serverUrl -> self baseUrl ).
-			( #debugMode -> true )}
+			{ #port -> port.
+			 #serverUrl -> self baseUrl.
+			 #debugMode -> true }
 		on: self.
 	consulAgent start
 ]
diff --git a/source/Stargate-Consul/ConsulServiceDefinitionBuilder.class.st b/source/Stargate-Consul/ConsulServiceDefinitionBuilder.class.st
index 82a05b9..f34b8dd 100644
--- a/source/Stargate-Consul/ConsulServiceDefinitionBuilder.class.st
+++ b/source/Stargate-Consul/ConsulServiceDefinitionBuilder.class.st
@@ -45,7 +45,7 @@ ConsulServiceDefinitionBuilder >> addCheck: aConsulAgentCheck [
 
 	| checks |
 
-	checks := serviceDefinition at: 'Checks' ifAbsentPut: [ OrderedCollection new ].
+	checks := serviceDefinition at: #Checks ifAbsentPut: [ OrderedCollection new ].
 	checks add: aConsulAgentCheck
 ]
 
@@ -55,14 +55,14 @@ ConsulServiceDefinitionBuilder >> addTag: aString [
 	| tags |
 
 	AssertionChecker enforce: [ aString notEmpty ] because: 'A tag cannot be empty'.
-	tags := serviceDefinition at: 'Tags' ifAbsentPut: [ OrderedCollection new ].
+	tags := serviceDefinition at: #Tags ifAbsentPut: [ OrderedCollection new ].
 	tags add: aString
 ]
 
 { #category : #configuring }
-ConsulServiceDefinitionBuilder >> address: aString [ 
-	
-	serviceDefinition at: 'Address' put: aString
+ConsulServiceDefinitionBuilder >> address: aString [
+
+	serviceDefinition at: #Address put: aString
 ]
 
 { #category : #private }
@@ -77,21 +77,21 @@ ConsulServiceDefinitionBuilder >> assertIsValidPort: aPortNumber [
 ConsulServiceDefinitionBuilder >> buildNamed: aServiceName [
 
 	AssertionChecker enforce: [ aServiceName notEmpty ] because: 'A service name cannot be empty'.
-	serviceDefinition at: 'Name' put: aServiceName.
+	serviceDefinition at: #Name put: aServiceName.
 	^ NeoJSONObject newFrom: serviceDefinition
 ]
 
 { #category : #configuring }
 ConsulServiceDefinitionBuilder >> enableTagOverride [
 
-	serviceDefinition at: 'EnableTagOverride' put: true
+	serviceDefinition at: #EnableTagOverride put: true
 ]
 
 { #category : #configuring }
 ConsulServiceDefinitionBuilder >> identifiedBy: aString [
 
 	AssertionChecker enforce: [ aString notEmpty ] because: 'An ID cannot be empty'.
-	serviceDefinition at: 'ID' put: aString
+	serviceDefinition at: #ID put: aString
 ]
 
 { #category : #initialization }
@@ -104,14 +104,14 @@ ConsulServiceDefinitionBuilder >> initialize [
 { #category : #configuring }
 ConsulServiceDefinitionBuilder >> metadataAt: aKey put: aValue [
 
-	serviceDefinition at: 'Meta' at: aKey put: aValue
+	serviceDefinition at: #Meta at: aKey put: aValue
 ]
 
 { #category : #configuring }
 ConsulServiceDefinitionBuilder >> port: anInteger [
 
 	self assertIsValidPort: anInteger.
-	serviceDefinition at: 'Port' put: anInteger
+	serviceDefinition at: #Port put: anInteger
 ]
 
 { #category : #configuring }
@@ -126,7 +126,7 @@ ConsulServiceDefinitionBuilder >> taggedAddressesAt: aTag on: aKey put: aValue [
 	| taggedAddresses |
 
 	taggedAddresses := serviceDefinition
-		at: 'TaggedAddresses'
+		at: #TaggedAddresses
 		ifAbsentPut: [ serviceDefinition species new ].
 	taggedAddresses at: aTag at: aKey put: aValue
 ]
diff --git a/source/Stargate-Consul/ConsulServiceDiscoveryPlugin.class.st b/source/Stargate-Consul/ConsulServiceDiscoveryPlugin.class.st
index 203aec3..8562702 100644
--- a/source/Stargate-Consul/ConsulServiceDiscoveryPlugin.class.st
+++ b/source/Stargate-Consul/ConsulServiceDiscoveryPlugin.class.st
@@ -72,7 +72,7 @@ ConsulServiceDiscoveryPlugin >> deregisterFromConsul: serviceDefinition [
 
 	deregisterRequest := HttpRequest
 		put: ( self deregistrationUrlFor: serviceDefinition )
-		configuredUsing: [ :request | request body json: {} asDictionary ].
+		configuredUsing: [ :request | request body json: Dictionary new ].
 	deregisterRequest applyOn: self newHttpClient
 ]