test(client): improve coverage of DoclingServeClientException

docling-serve/docling-serve-client/src/test/java/ai/docling/serve/client/DoclingServeClientExceptionTests.java

@@ -0,0 +1,58 @@
+package ai.docling.serve.client;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+class DoclingServeClientExceptionTests {
+  @Test
+  void constructWithCause() {
+    var cause = new RuntimeException("original");
+    var exception = new DoclingServeClientException(cause);
+
+    assertThat(exception.getMessage()).isEqualTo("original");
+    assertThat(exception.getCause()).isSameAs(cause);
+    assertThat(exception.getStatusCode()).isEqualTo(-1);
+    assertThat(exception.getResponseBody()).isNull();
+  }
+
+  @Test
+  void constructWithNullCause() {
+    var exception = new DoclingServeClientException((Throwable) null);
+
+    assertThat(exception.getMessage()).isEqualTo("An error occurred");
+    assertThat(exception.getCause()).isNull();
+    assertThat(exception.getStatusCode()).isEqualTo(-1);
+    assertThat(exception.getResponseBody()).isNull();
+  }
+
+  @Test
+  void constructWithCauseAndMessage() {
+    var cause = new RuntimeException("root");
+    var exception = new DoclingServeClientException(cause, "custom message");
+
+    assertThat(exception.getMessage()).isEqualTo("custom message");
+    assertThat(exception.getCause()).isSameAs(cause);
+    assertThat(exception.getStatusCode()).isEqualTo(-1);
+    assertThat(exception.getResponseBody()).isNull();
+  }
+
+  @Test
+  void constructWithStatusCodeAndResponseBody() {
+    var exception = new DoclingServeClientException("request failed", 503, "Service Unavailable");
+
+    assertThat(exception.getMessage()).isEqualTo("request failed");
+    assertThat(exception.getStatusCode()).isEqualTo(503);
+    assertThat(exception.getResponseBody()).isEqualTo("Service Unavailable");
+    assertThat(exception.getCause()).isNull();
+  }
+
+  @Test
+  void constructWithStatusCodeAndNullResponseBody() {
+    var exception = new DoclingServeClientException("not found", 404, null);
+
+    assertThat(exception.getMessage()).isEqualTo("not found");
+    assertThat(exception.getStatusCode()).isEqualTo(404);
+    assertThat(exception.getResponseBody()).isNull();
+  }
+}