add deserialization test

src/test/java/io/github/stefanbratanov/jvm/openai/DeserializationTest.java

@@ -0,0 +1,33 @@
+package io.github.stefanbratanov.jvm.openai;
+
+import static io.github.stefanbratanov.jvm.openai.TestUtil.getStringResource;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+public class DeserializationTest {
+
+  private final ObjectMapper objectMapper = ObjectMapperSingleton.getInstance();
+
+  @Test
+  public void deserializesChatCompletionChunk() throws JsonProcessingException {
+    ChatCompletionChunk result =
+        objectMapper.readValue(
+            getStringResource("/chat-completion-chunk.json"), ChatCompletionChunk.class);
+
+    assertThat(result).isNotNull();
+    assertThat(result.id()).isEqualTo("chatcmpl-xyz");
+    assertThat(result.choices())
+        .hasSize(1)
+        .first()
+        .satisfies(
+            choice -> {
+              assertThat(choice.index()).isZero();
+              assertThat(choice.delta().role()).isEqualTo("assistant");
+              assertThat(choice.delta().content()).isEqualTo("");
+              assertThat(choice.finishReason()).isNull();
+            });
+  }
+}

src/test/java/io/github/stefanbratanov/jvm/openai/OpenAIAssistantsApiIntegrationTest.java

@@ -1,5 +1,6 @@
 package io.github.stefanbratanov.jvm.openai;
 
+import static io.github.stefanbratanov.jvm.openai.TestUtil.getTestResource;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 

src/test/java/io/github/stefanbratanov/jvm/openai/OpenAIIntegrationTest.java

@@ -1,5 +1,6 @@
 package io.github.stefanbratanov.jvm.openai;
 
+import static io.github.stefanbratanov.jvm.openai.TestUtil.getTestResource;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 

src/test/java/io/github/stefanbratanov/jvm/openai/OpenAIIntegrationTestBase.java

@@ -4,11 +4,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockserver.mock.OpenAPIExpectation.openAPIExpectation;
 
-import java.net.URISyntaxException;
-import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.time.Duration;
-import java.util.Objects;
 import java.util.concurrent.*;
 import java.util.function.Supplier;
 import org.junit.jupiter.api.AfterAll;
@@ -56,15 +52,6 @@ public static void cleanUp() {
     mockServer.stop();
   }
 
-  protected Path getTestResource(String resource) {
-    try {
-      return Paths.get(
-          Objects.requireNonNull(OpenAIIntegrationTestBase.class.getResource(resource)).toURI());
-    } catch (URISyntaxException ex) {
-      throw new RuntimeException(ex);
-    }
-  }
-
   protected void awaitCondition(
       Supplier<Boolean> condition, Duration pollingInterval, Duration timeout) {
     ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();

src/test/java/io/github/stefanbratanov/jvm/openai/TestUtil.java

@@ -0,0 +1,28 @@
+package io.github.stefanbratanov.jvm.openai;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.net.URISyntaxException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Objects;
+
+public class TestUtil {
+
+  public static Path getTestResource(String resource) {
+    try {
+      return Paths.get(Objects.requireNonNull(TestUtil.class.getResource(resource)).toURI());
+    } catch (URISyntaxException ex) {
+      throw new RuntimeException(ex);
+    }
+  }
+
+  public static String getStringResource(String resource) {
+    try {
+      return Files.readString(getTestResource(resource));
+    } catch (IOException ex) {
+      throw new UncheckedIOException(ex);
+    }
+  }
+}

src/test/resources/chat-completion-chunk.json

@@ -0,0 +1,18 @@
+{
+  "id": "chatcmpl-xyz",
+  "object": "chat.completion.chunk",
+  "created": 1711604346,
+  "model": "gpt-4-0613",
+  "system_fingerprint": null,
+  "choices": [
+    {
+      "index": 0,
+      "delta": {
+        "role": "assistant",
+        "content": ""
+      },
+      "logprobs": null,
+      "finish_reason": null
+    }
+  ]
+}