Add utilities to help with JSON testing

Add Jackson, Gson and Basic String helper classes that allow AssertJ
assertions to be used to test JSON.

Fixes gh-5471

spring-boot-test/pom.xml

@@ -25,6 +25,16 @@
 			<artifactId>spring-boot</artifactId>
 		</dependency>
 		<!-- Optional -->
+		<dependency>
+			<groupId>com.fasterxml.jackson.core</groupId>
+			<artifactId>jackson-databind</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>com.google.code.gson</groupId>
+			<artifactId>gson</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>javax.servlet</groupId>
 			<artifactId>javax.servlet-api</artifactId>
@@ -60,6 +70,11 @@
 			<artifactId>mockito-core</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.skyscreamer</groupId>
+			<artifactId>jsonassert</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-test</artifactId>
@@ -102,6 +117,10 @@
 			<optional>true</optional>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>com.jayway.jsonpath</groupId>
+			<artifactId>json-path</artifactId>
+		</dependency>
 	</dependencies>
 	<build>
 		<plugins>