diff --git a/src/main/java/tech/jhipster/lite/generator/server/springboot/langchain4j/domain/LangChain4JModuleFactory.java b/src/main/java/tech/jhipster/lite/generator/server/springboot/langchain4j/domain/LangChain4JModuleFactory.java
index 483d6dd54ac..fec93529b00 100644
--- a/src/main/java/tech/jhipster/lite/generator/server/springboot/langchain4j/domain/LangChain4JModuleFactory.java
+++ b/src/main/java/tech/jhipster/lite/generator/server/springboot/langchain4j/domain/LangChain4JModuleFactory.java
@@ -40,6 +40,9 @@ public JHipsterModule buildModule(JHipsterModuleProperties properties) {
         .set(propertyKey("langchain4j.open-ai.chat-model.log-requests"), propertyValue("true"))
         .set(propertyKey("langchain4j.open-ai.chat-model.log-responses"), propertyValue("true"))
         .and()
+      .springTestProperties()
+        .set(propertyKey("langchain4j.open-ai.chat-model.api-key"), propertyValue("jhipster"))
+        .and()
       .build();
     //@formatter:on
   }
diff --git a/src/test/java/tech/jhipster/lite/generator/server/springboot/langchain4j/domain/LangChain4JModuleFactoryTest.java b/src/test/java/tech/jhipster/lite/generator/server/springboot/langchain4j/domain/LangChain4JModuleFactoryTest.java
index fb51b511606..15e4afb3c67 100644
--- a/src/test/java/tech/jhipster/lite/generator/server/springboot/langchain4j/domain/LangChain4JModuleFactoryTest.java
+++ b/src/test/java/tech/jhipster/lite/generator/server/springboot/langchain4j/domain/LangChain4JModuleFactoryTest.java
@@ -62,6 +62,16 @@ void shouldCreateModule() {
               log-responses: 'true'
               model-name: gpt-4o-mini
         """
+      )
+      .and()
+      .hasFile("src/test/resources/config/application-test.yml")
+      .containing(
+        """
+        langchain4j:
+          open-ai:
+            chat-model:
+              api-key: jhipster
+        """
       );
   }
 }