Lower visibility on tests by making them non public

Author: sandjelkovic

kotlin/src/test/kotlin/org/axonframework/extensions/kotlin/CommandGatewayExtensionsTest.kt

@@ -32,7 +32,7 @@ import kotlin.test.Test
  *
  * @author Stefan Andjelkovic
  */
-class CommandGatewayExtensionsTest {
+internal class CommandGatewayExtensionsTest {
     private val subjectGateway = mockk<CommandGateway>()
 
     private val exampleCommand = ExampleCommand("1")

kotlin/src/test/kotlin/org/axonframework/extensions/kotlin/QueryGatewayExtensionsTest.kt

@@ -35,7 +35,7 @@ import kotlin.test.assertTrue
  *
  * @author Stefan Andjelkovic
  */
-class QueryGatewayExtensionsTest {
+internal class QueryGatewayExtensionsTest {
 
     private val queryName = ExampleQuery::class.qualifiedName.toString()
     private val exampleQuery = ExampleQuery(2)

kotlin/src/test/kotlin/org/axonframework/extensions/kotlin/ResultDiscriminatorCommandCallbackTest.kt

@@ -32,7 +32,7 @@ import kotlin.test.fail
  *
  * @author Stefan Andjelkovic
  */
-class ResultDiscriminatorCommandCallbackTest {
+internal class ResultDiscriminatorCommandCallbackTest {
     private val command = ExampleCommand("1")
     private val commandMessage: CommandMessage<ExampleCommand> = GenericCommandMessage.asCommandMessage(command)
     private val responsePayloadUUID = UUID.randomUUID().toString()