Ollama: test that OpenAI API (OpenAiChatModel) works

langchain4j-ollama/pom.xml

@@ -76,6 +76,12 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>dev.langchain4j</groupId>
+            <artifactId>langchain4j-open-ai</artifactId>
+            <scope>test</scope>
+        </dependency>
+
         <dependency>
             <groupId>org.tinylog</groupId>
             <artifactId>tinylog-impl</artifactId>

langchain4j-ollama/src/test/java/dev/langchain4j/model/ollama/OllamaOpenAiChatModelIT.java

@@ -0,0 +1,55 @@
+package dev.langchain4j.model.ollama;
+
+import dev.langchain4j.data.message.AiMessage;
+import dev.langchain4j.data.message.UserMessage;
+import dev.langchain4j.model.chat.ChatLanguageModel;
+import dev.langchain4j.model.openai.OpenAiChatModel;
+import dev.langchain4j.model.output.Response;
+import dev.langchain4j.model.output.TokenUsage;
+import org.junit.jupiter.api.Test;
+
+import static dev.langchain4j.model.ollama.OllamaImage.TINY_DOLPHIN_MODEL;
+import static dev.langchain4j.model.output.FinishReason.STOP;
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests if Ollama can be used via OpenAI API (langchain4j-open-ai module)
+ * See https://github.com/ollama/ollama/blob/main/docs/openai.md
+ */
+class OllamaOpenAiChatModelIT extends AbstractOllamaLanguageModelInfrastructure {
+
+    ChatLanguageModel model = OpenAiChatModel.builder()
+            .apiKey("does not matter") // TODO make apiKey optional when using custom baseUrl?
+            .baseUrl(ollama.getEndpoint() + "/v1") // TODO add "/v1" by default?
+            .modelName(TINY_DOLPHIN_MODEL)
+            .temperature(0.0)
+            .logRequests(true)
+            .logResponses(true)
+            .build();
+
+    @Test
+    void should_generate_response() {
+
+        // given
+        UserMessage userMessage = UserMessage.from("What is the capital of Germany?");
+
+        // when
+        Response<AiMessage> response = model.generate(userMessage);
+        System.out.println(response);
+
+        // then
+        AiMessage aiMessage = response.content();
+        assertThat(aiMessage.text()).contains("Berlin");
+        assertThat(aiMessage.toolExecutionRequests()).isNull();
+
+        TokenUsage tokenUsage = response.tokenUsage();
+        assertThat(tokenUsage.inputTokenCount()).isEqualTo(35);
+        assertThat(tokenUsage.outputTokenCount()).isGreaterThan(0);
+        assertThat(tokenUsage.totalTokenCount())
+                .isEqualTo(tokenUsage.inputTokenCount() + tokenUsage.outputTokenCount());
+
+        assertThat(response.finishReason()).isEqualTo(STOP);
+    }
+
+    // TODO add more tests
+}