diff --git a/tests/OfflineTests/ObjectRetrieverMockTest.php b/tests/OfflineTests/ObjectRetrieverMockTest.php
index 6e88d70..170fcf5 100644
--- a/tests/OfflineTests/ObjectRetrieverMockTest.php
+++ b/tests/OfflineTests/ObjectRetrieverMockTest.php
@@ -8,14 +8,18 @@ namespace CloudObjects\SDK;
 
 use ML\IRI\IRI;
 use GuzzleHttp\Client, GuzzleHttp\Handler\MockHandler,
-    GuzzleHttp\HandlerStack, GuzzleHttp\Psr7\Response;
+    GuzzleHttp\HandlerStack, GuzzleHttp\Psr7\Request, GuzzleHttp\Psr7\Response;
+use GuzzleHttp\Exception\ConnectException;
 use CloudObjects\SDK\Exceptions\CoreAPIException;
 
 class ObjectRetrieverMockTest extends \PHPUnit\Framework\TestCase {
 
     private $retriever;
 
-    private function setMockResponse(Response $response) {
+    /**
+     * @param Response|\Throwable $response A response, or an exception to throw instead.
+     */
+    private function setMockResponse($response) {
         $mock = new MockHandler([$response]);
         $handler = HandlerStack::create($mock);
         $this->retriever->setClient(new Client(['handler' => $handler]));
@@ -70,4 +74,20 @@ class ObjectRetrieverMockTest extends \PHPUnit\Framework\TestCase {
         $this->retriever->getObjectNode($coid);
     }
 
+    public function testWhenAPITimesOut() {
+        $this->setMockResponse(new ConnectException(
+            'cURL error 28: Operation timed out',
+            new Request('GET', 'cloudobjects.io')
+        ));
+
+        $coid = new IRI('coid://cloudobjects.io');
+
+        try {
+            $this->retriever->getObjectNode($coid);
+            $this->fail('Expected CoreAPIException was not thrown.');
+        } catch (CoreAPIException $e) {
+            $this->assertInstanceOf(ConnectException::class, $e->getPrevious());
+        }
+    }
+
 }