refactor(JsoupSiteParserTest): use AssertJ instead of Hamcrest for assertions.

See also:
- https://assertj.github.io/doc/#assertj-core-quick-start
- https://www.baeldung.com/introduction-to-assertj

Part of #1035

Author: php-coder

pom.xml

@@ -359,6 +359,13 @@
 			<scope>test</scope>
 		</dependency>
 
+		<dependency>
+			<groupId>org.assertj</groupId>
+			<artifactId>assertj-core</artifactId>
+			<version>${assertj.version}</version>
+			<scope>test</scope>
+		</dependency>
+		
 		<dependency>
 			<groupId>org.codehaus.groovy</groupId>
 			<artifactId>groovy-all</artifactId>
@@ -436,6 +443,9 @@
 		<!-- Set JVM options for maven-surefire-plugin -->
 		<argLine>-Xss256k</argLine>
 
+		<!-- Redefine default value from spring-boot-dependencies (https://github.com/spring-projects/spring-boot/blob/v1.5.22.RELEASE/spring-boot-dependencies/pom.xml) -->
+		<assertj.version>3.14.0</assertj.version>
+		
 		<!-- Don't forget to update version in the ResourceUrl class -->
 		<bootstrap.version>3.4.1</bootstrap.version>