Fix intermittent streaming response aggregation test failure (#4135)

Fix OpenAiChatClientIT.beanStreamOutputConverterRecords test that was failing intermittently when run as part of a test suite due to empty streaming chunks causing malformed JSON during aggregation. Changes: - Filter out empty/null text chunks before aggregation to prevent malformed JSON - Replace silent return with explicit test failure when streaming aggregation produces empty results - Add debugging logs to aid troubleshooting of streaming response issues The test now properly detects and reports streaming aggregation problems instead of silently skipping, improving CI reliability and error detection. Fixes #4134 Signed-off-by: Mark Pollack <mark.pollack@broadcom.com> (cherry picked from commit 85c194c)

Author: markpollack

models/spring-ai-openai/src/test/java/org/springframework/ai/openai/chat/client/OpenAiChatClientIT.java

@@ -56,6 +56,7 @@
 import org.springframework.util.MimeTypeUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.fail;
 
 @SpringBootTest(classes = OpenAiTestConfiguration.class)
 @EnabledIfEnvironmentVariable(named = "OPENAI_API_KEY", matches = ".+")
@@ -235,9 +236,18 @@ void beanStreamOutputConverterRecords() {
 .stream()
 .filter(cr -> cr.getResult() != null)
 .map(cr -> cr.getResult().getOutput().getText())
+.filter(text -> text != null && !text.trim().isEmpty()) // Filter out empty/null text
 .collect(Collectors.joining());
 // @formatter:on
 
+// Add debugging to understand what text we're trying to parse
+logger.debug("Aggregated streaming text: {}", generationTextFromStream);
+
+// Ensure we have valid JSON before attempting conversion
+if (generationTextFromStream.trim().isEmpty()) {
+fail("Empty aggregated text from streaming response - this indicates a problem with streaming aggregation");
+}
+
 ActorsFilms actorsFilms = outputConverter.convert(generationTextFromStream);
 
 logger.info("" + actorsFilms);