Replace order of given/willAnswer for spied objects

The cause of the test hang was that the test was incorrectly setting up
the spy on the type message builder impl. In previous Pulsar version of
TypedMessageBuilderImpl, the fact that the method sendAsync was being
called at mock setup time was not causing an issue. However, in the
latest impl it did not like that and was throwing things off.

Spied objects should always use the `doReturn|Answer|Throw()` family
as described in https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#important-gotcha-on-spying-real-objects--heading

pulsar-client-reactive-adapter/src/test/java/org/apache/pulsar/reactive/client/internal/adapter/AdaptedReactiveMessageSenderTests.java

@@ -77,6 +77,7 @@
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.ArgumentMatchers.isNull;
 import static org.mockito.BDDMockito.given;
+import static org.mockito.BDDMockito.willAnswer;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
@@ -195,11 +196,11 @@ void sendOnePulsarException() throws Exception {
 		given(producer.newMessage()).willAnswer((__) -> {
 			TypedMessageBuilderImpl<String> typedMessageBuilder = spy(
 					new TypedMessageBuilderImpl<>(producer, Schema.STRING));
-			given(typedMessageBuilder.sendAsync()).willAnswer((___) -> {
+			willAnswer((___) -> {
 				CompletableFuture<MessageId> failed = new CompletableFuture<>();
 				failed.completeExceptionally(new ProducerQueueIsFullError("Queue is full"));
 				return failed;
-			});
+			}).given(typedMessageBuilder).sendAsync();
 			return typedMessageBuilder;
 		});
 
@@ -231,7 +232,7 @@ void sendManyStopOnError() throws Exception {
 		given(producer.newMessage()).willAnswer((__) -> {
 			TypedMessageBuilderImpl<String> typedMessageBuilder = spy(
 					new TypedMessageBuilderImpl<>(producer, Schema.STRING));
-			given(typedMessageBuilder.sendAsync()).willAnswer((___) -> {
+			willAnswer((___) -> {
 				if (entryId.get() == 1) {
 					CompletableFuture<MessageId> failed = new CompletableFuture<>();
 					failed.completeExceptionally(new ProducerQueueIsFullError("Queue is full"));
@@ -241,7 +242,7 @@ void sendManyStopOnError() throws Exception {
 					.newMessageId(1, entryId.incrementAndGet(), 1);
 				messageIds.add(messageId);
 				return CompletableFuture.completedFuture(messageId);
-			});
+			}).given(typedMessageBuilder).sendAsync();
 			return typedMessageBuilder;
 		});
 
@@ -279,7 +280,7 @@ void sendMany() throws Exception {
 		given(producer.newMessage()).willAnswer((__) -> {
 			TypedMessageBuilderImpl<String> typedMessageBuilder = spy(
 					new TypedMessageBuilderImpl<>(producer, Schema.STRING));
-			given(typedMessageBuilder.sendAsync()).willAnswer((___) -> {
+			willAnswer((___) -> {
 				if (entryId.get() == 2) {
 					CompletableFuture<MessageId> failed = new CompletableFuture<>();
 					failed.completeExceptionally(new ProducerQueueIsFullError("Queue is full"));
@@ -289,7 +290,7 @@ void sendMany() throws Exception {
 					.newMessageId(1, entryId.incrementAndGet(), 1);
 				messageIds.add(messageId);
 				return CompletableFuture.completedFuture(messageId);
-			});
+			}).given(typedMessageBuilder).sendAsync();
 			return typedMessageBuilder;
 		});
 
@@ -498,7 +499,7 @@ void doTestMaxInFlight(BiFunction<ReactiveMessageSender<String>, Flux<Integer>,
 			given(producer.newMessage()).willAnswer((__) -> {
 				TypedMessageBuilderImpl<String> typedMessageBuilder = spy(
 						new TypedMessageBuilderImpl<>(producer, Schema.STRING));
-				given(typedMessageBuilder.sendAsync()).willAnswer((___) -> {
+				willAnswer((___) -> {
 					CompletableFuture<MessageId> messageSender = new CompletableFuture<>();
 					finalExecutorService.execute(() -> {
 						long current = totalRequests.incrementAndGet();
@@ -512,7 +513,7 @@ void doTestMaxInFlight(BiFunction<ReactiveMessageSender<String>, Flux<Integer>,
 								DefaultImplementation.getDefaultImplementation().newMessageId(1, encodedEntryId, 1));
 					}, 100, TimeUnit.MILLISECONDS);
 					return messageSender;
-				});
+				}).given(typedMessageBuilder).sendAsync();
 				return typedMessageBuilder;
 			});