code review: add additional assert

Signed-off-by: Patrik Ivarsson <[email protected]>

micrometer-core/src/test/java/io/micrometer/core/instrument/binder/logging/Log4j2MetricsTest.java

@@ -270,6 +270,7 @@ void shouldNotRebindMetricsIfBinderIsClosed() {
         try (Log4j2Metrics metrics = new Log4j2Metrics(emptyList(), context)) {
             metrics.bindTo(registry);
             logger.error("first");
+            assertThat(registry.get("log4j2.events").tags("level", "error").counter().count()).isEqualTo(1);
         }
 
         // This will reload the configuration to default