Fix HooksTest compile: access RunnableWrapper via package-private + reflection for resetOnScheduleHook

Author: trask

instrumentation/reactor/reactor-3.1/library/src/main/java/io/opentelemetry/instrumentation/reactor/v3_1/ContextPropagationOperator.java

@@ -388,7 +388,7 @@ public Object scanUnsafe(Scannable.Attr attr) {
     }
   }
 
-  private static class RunnableWrapper implements Runnable {
+  static class RunnableWrapper implements Runnable {
     private final Runnable delegate;
     private final Context context;
 

instrumentation/reactor/reactor-3.1/library/src/test/java/io/opentelemetry/instrumentation/reactor/v3_1/HooksTest.java

@@ -43,7 +43,13 @@ class HooksTest {
   void resetHooks() {
     Hooks.resetOnEachOperator(TracingSubscriber.class.getName());
     if (schedulerHooksSupported()) {
-      Schedulers.resetOnScheduleHook(RunnableWrapper.class.getName());
+      try {
+        Schedulers.class
+            .getMethod("resetOnScheduleHook", String.class)
+            .invoke(null, ContextPropagationOperator.RunnableWrapper.class.getName());
+      } catch (ReflectiveOperationException e) {
+        throw new LinkageError(e.getMessage(), e);
+      }
     }
   }