Refactor jcache examples (#2620)

libraries/src/test/java/com/baeldung/jcache/CacheLoaderTest.java

@@ -9,11 +9,14 @@ import javax.cache.configuration.FactoryBuilder;
 import javax.cache.configuration.MutableConfiguration;
 import javax.cache.spi.CachingProvider;
 
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 
 public class CacheLoaderTest {
 
+    private static final String CACHE_NAME = "SimpleCache";
+
     private Cache<Integer, String> cache;
 
     @Before
@@ -25,6 +28,12 @@ public class CacheLoaderTest {
         this.cache = cacheManager.createCache("SimpleCache", config);
     }
 
+    @After
+    public void tearDown() {
+        Caching.getCachingProvider()
+          .getCacheManager().destroyCache(CACHE_NAME);
+    }
+
     @Test
     public void whenReadingFromStorage_thenCorrect() {
         for (int i = 1; i < 4; i++) {