Fix test

Author: trask

instrumentation/spring/spring-webmvc/spring-webmvc-common/testing/src/main/java/io/opentelemetry/instrumentation/spring/webmvc/boot/AbstractSpringBootBasedTest.java

@@ -161,9 +161,14 @@ void deferredResult() {
                       assertServerSpan(span, "GET", DEFERRED_RESULT, DEFERRED_RESULT.getStatus());
                       span.hasNoParent();
                     },
+                    span ->
+                        assertHandlerSpan(span, "GET", DEFERRED_RESULT).hasParent(trace.getSpan(0)),
+                    // Handler method runs once for the initial request and again for the async
+                    // redispatch when DeferredResult completes, so we expect two spans with the
+                    // same name.
                     span ->
                         assertHandlerSpan(span, "GET", DEFERRED_RESULT)
-                            .hasParent(trace.getSpan(0))),
+                            .hasParent(trace.getSpan(1))),
             trace ->
                 trace.hasSpansSatisfyingExactly(
                     span ->