Idiomatic refactor (#2063)

* StringToCharStream

* Spring integration tests

* Spring integration tests

spring-vertx/src/test/java/com/baeldung/vertxspring/VertxSpringApplicationIntegrationTest.java

@@ -16,8 +16,9 @@ public class VertxSpringApplicationIntegrationTest {
     private TestRestTemplate restTemplate = new TestRestTemplate();
 
     @Test
-    public void givenUrl_whenReceivedArticles_thenSuccess() {
+    public void givenUrl_whenReceivedArticles_thenSuccess() throws InterruptedException {
         ResponseEntity<String> responseEntity = restTemplate.getForEntity("http://localhost:8080/api/baeldung/articles", String.class);
+
         assertEquals(200, responseEntity.getStatusCodeValue());
     }