delete extra comments and variable assignments, use guava precondition for check

spring-core/src/test/java/com/baeldung/factorybean/FactoryBeanInitializeTest.java

@@ -1,17 +1,16 @@
 package com.baeldung.factorybean;
 
 import org.junit.Test;
-import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;
 
 public class FactoryBeanInitializeTest {
     @Test(expected = Exception.class)
     public void testInitializationToolFactory() {
-        ApplicationContext context = new ClassPathXmlApplicationContext("classpath:factorybean-init-spring-ctx.xml");
+        new ClassPathXmlApplicationContext("classpath:factorybean-init-spring-ctx.xml");
     }
 
     @Test(expected = Exception.class)
     public void testPostConstructToolFactory() {
-        ApplicationContext context = new ClassPathXmlApplicationContext("classpath:factorybean-postconstruct-spring-ctx.xml");
+        new ClassPathXmlApplicationContext("classpath:factorybean-postconstruct-spring-ctx.xml");
     }
 }