diff --git a/tests/src/Unit/process/TransposeTest.php b/tests/src/Unit/process/TransposeTest.php
index 7b9006253d0027e252b4f918170b9631bc7ec6ef..453b602cf892bab9e04d1233108f62889e50b0c3 100644
--- a/tests/src/Unit/process/TransposeTest.php
+++ b/tests/src/Unit/process/TransposeTest.php
@@ -48,6 +48,10 @@ class TransposeTest extends MigrateProcessTestCase {
         'input' => [],
         'expected_output' => [],
       ],
+      'simple array' => [
+        'input' => [1, 2, 3],
+        'expected_output' => [[1, 2, 3]],
+      ],
       'image files and alt text' => [
         'input' => [
           ['2.png', '3.png', '5.png', '7.png'],