fix tests

Author: CharlesDuboisSAP

core/src/main/java/com/sap/ai/sdk/core/AiCoreServiceKeyAccessor.java

@@ -29,7 +29,7 @@ class AiCoreServiceKeyAccessor implements ServiceBindingAccessor {
 
   private final Lazy<Dotenv> dotenv;
 
-  private static List<ServiceBinding> serviceBindings;
+  static List<ServiceBinding> serviceBindings;
 
   AiCoreServiceKeyAccessor() {
     this(Dotenv.configure().ignoreIfMissing().ignoreIfMalformed());

core/src/main/java/com/sap/ai/sdk/core/common/ClientResponseHandler.java

@@ -88,9 +88,10 @@ private T parseSuccess(@Nonnull final ClassicHttpResponse response) throws E {
             .getOrElseThrow(e -> exceptionFactory.build(message, e).setHttpResponse(response));
     try {
       final T value = objectMapper.readValue(content, successType);
-      log.info(
-          "LLM request success with duration:{}",
-          response.getHeaders("x-upstream-service-time")[0].getValue());
+      val timeHeaders = response.getHeaders("x-upstream-service-time");
+      if (timeHeaders.length > 0) {
+        log.info("LLM request success with duration:{}", timeHeaders[0].getValue());
+      }
       return value;
     } catch (final JsonProcessingException e) {
       log.error("Failed to parse response to type {}", successType);

core/src/test/java/com/sap/ai/sdk/core/AiCoreServiceKeyAccessorTest.java

@@ -9,10 +9,16 @@
 import com.sap.cloud.environment.servicebinding.api.exception.ServiceBindingAccessException;
 import io.github.cdimascio.dotenv.Dotenv;
 import java.util.Map;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 class AiCoreServiceKeyAccessorTest {
 
+  @BeforeEach
+  void resetServiceBindings() {
+    AiCoreServiceKeyAccessor.serviceBindings = null;
+  }
+
   @Test
   void testValidDotenv() {
     var dotenv = spy(Dotenv.configure().filename("valid.testenv"));