diff --git a/tests/cases/REST/NextCloudNews/PDO/TestV1_2.php b/tests/cases/REST/NextCloudNews/PDO/TestV1_2.php
index ecf4fb74..c6a3ef77 100644
--- a/tests/cases/REST/NextCloudNews/PDO/TestV1_2.php
+++ b/tests/cases/REST/NextCloudNews/PDO/TestV1_2.php
@@ -8,17 +8,5 @@ namespace JKingWeb\Arsse\TestCase\REST\NextCloudNews\PDO;
 
 /** @covers \JKingWeb\Arsse\REST\NextCloudNews\V1_2<extended> */
 class TestV1_2 extends \JKingWeb\Arsse\TestCase\REST\NextCloudNews\TestV1_2 {
-    protected function v($value) {
-        if (!is_array($value)) {
-            return $value;
-        }
-        foreach($value as $k => $v) {
-            if (is_array($v)) {
-                $value[$k] = $this->v($v);
-            } elseif (is_int($v) || is_float($v)) {
-                $value[$k] = (string) $v;
-            }
-        }
-        return $value;
-    }
+    use \JKingWeb\Arsse\Test\PDOTest;
 }
diff --git a/tests/cases/REST/TinyTinyRSS/PDO/TestAPI.php b/tests/cases/REST/TinyTinyRSS/PDO/TestAPI.php
index 7586eee1..9c9e36f1 100644
--- a/tests/cases/REST/TinyTinyRSS/PDO/TestAPI.php
+++ b/tests/cases/REST/TinyTinyRSS/PDO/TestAPI.php
@@ -9,17 +9,5 @@ namespace JKingWeb\Arsse\TestCase\REST\TinyTinyRSS\PDO;
 /** @covers \JKingWeb\Arsse\REST\TinyTinyRSS\API<extended>
  *  @covers \JKingWeb\Arsse\REST\TinyTinyRSS\Exception */
 class TestAPI extends \JKingWeb\Arsse\TestCase\REST\TinyTinyRSS\TestAPI {
-    protected function v($value) {
-        if (!is_array($value)) {
-            return $value;
-        }
-        foreach($value as $k => $v) {
-            if (is_array($v)) {
-                $value[$k] = $this->v($v);
-            } elseif (is_int($v) || is_float($v)) {
-                $value[$k] = (string) $v;
-            }
-        }
-        return $value;
-    }
+    use \JKingWeb\Arsse\Test\PDOTest;
 }
\ No newline at end of file
diff --git a/tests/lib/PDOTest.php b/tests/lib/PDOTest.php
new file mode 100644
index 00000000..3013734f
--- /dev/null
+++ b/tests/lib/PDOTest.php
@@ -0,0 +1,23 @@
+<?php
+/** @license MIT
+ * Copyright 2017 J. King, Dustin Wilson et al.
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace JKingWeb\Arsse\Test;
+
+trait PDOTest {
+    protected function v($value) {
+        if (!is_array($value)) {
+            return $value;
+        }
+        foreach($value as $k => $v) {
+            if (is_array($v)) {
+                $value[$k] = $this->v($v);
+            } elseif (is_int($v) || is_float($v)) {
+                $value[$k] = (string) $v;
+            }
+        }
+        return $value;
+    }
+}
\ No newline at end of file