244: Add a test case where values are cast to arrays

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'],