Migrate from fest-assert to assertj

Fixes gh-338

docs/src/test/java/docs/HttpSessionConfigurationNoOpConfigureRedisActionXmlTests.java

@@ -15,7 +15,7 @@
  */
 package docs;
 
-import static org.fest.assertions.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.*;
 import static org.mockito.Mockito.mock;
 
 import org.junit.Test;

docs/src/test/java/docs/IndexDocTests.java

@@ -15,10 +15,9 @@
  */
 package docs;
 
-import static org.fest.assertions.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.*;
 
 import org.junit.Test;
-import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
 import org.springframework.mock.web.MockServletContext;
 import org.springframework.session.ExpiringSession;

docs/src/test/java/docs/http/AbstractHttpSessionListenerTests.java

@@ -15,7 +15,7 @@
  */
 package docs.http;
 
-import static org.fest.assertions.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.*;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;