Polish "Migrate Kotlin tests to Mockk"

Closes gh-15993

spring-boot-project/spring-boot-test/pom.xml

@@ -146,6 +146,11 @@
 			<artifactId>logback-classic</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>io.mockk</groupId>
+			<artifactId>mockk</artifactId>
+			<scope>test</scope>
+		</dependency>
 		<dependency>
 			<groupId>org.apache.tomcat.embed</groupId>
 			<artifactId>tomcat-embed-core</artifactId>
@@ -187,11 +192,6 @@
 			<artifactId>spring-webmvc</artifactId>
 			<scope>test</scope>
 		</dependency>
-		<dependency>
-			<groupId>io.mockk</groupId>
-			<artifactId>mockk</artifactId>
-			<scope>test</scope>
-		</dependency>
 		<dependency>
 			<groupId>org.testng</groupId>
 			<artifactId>testng</artifactId>

spring-boot-project/spring-boot-test/src/test/kotlin/org/springframework/boot/test/web/client/TestRestTemplateExtensionsTests.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.