Prove that DbBackedMutexWrapper is broken on 8.1

Due to PDO_MYSQL changing behaviour and returning ints as
ints instead of strings. Obviously can't actually prove
this on a DB connection in these unit tests, but the mock
now mirrors PDO behaviour depending on PHP version.

Author: acoulton

test/unit/Mutex/BasicPDOStatementStub.php

@@ -40,6 +40,18 @@ public function __construct(array $result) { $this->result = $result; }
 
         public function fetchAll(int $fetch_style = NULL, mixed ...$fetch_argument): array
         {
+            if (PHP_VERSION_ID < 80100) {
+                // Before 8.1, ints and floats were returned as strings
+                // https://www.php.net/manual/en/migration81.incompatible.php#migration81.incompatible.pdo.mysql
+                $this->result = array_map(
+                    fn($row) => array_map(
+                        fn($column) => (is_int($column) || \is_float($column)) ? (string) $column : $column,
+                        $row
+                    ),
+                    $this->result
+                );
+            }
+
             if ($fetch_style === NULL) {
                 return $this->result;
             } elseif ($fetch_style === PDO::FETCH_COLUMN) {
@@ -51,4 +63,4 @@ public function fetchAll(int $fetch_style = NULL, mixed ...$fetch_argument): arr
 
 
     }
-}
+}

test/unit/Mutex/DbBackedMutexWrapperTest.php

@@ -29,11 +29,11 @@ public function test_it_requests_lock_and_throws_if_not_available_without_runnin
             [
                 [
                     'sql'    => 'SELECT GET_LOCK({quoted-mylock}, 5)',
-                    'result' => [['0']]
+                    'result' => [[0]]
                 ],
                 [
                     'sql'    => 'SELECT RELEASE_LOCK({quoted-mylock})',
-                    'result' => [['0']]
+                    'result' => [[0]]
                 ],
             ]
         );
@@ -53,11 +53,11 @@ public function test_it_releases_lock_after_successful_callback_and_returns_resu
             [
                 [
                     'sql'    => 'SELECT GET_LOCK({quoted-somelock}, 2)',
-                    'result' => [['1']]
+                    'result' => [[1]]
                 ],
                 [
                     'sql'    => 'SELECT RELEASE_LOCK({quoted-somelock})',
-                    'result' => [['0']]
+                    'result' => [[0]]
                 ],
             ]
         );
@@ -80,11 +80,11 @@ public function test_it_releases_lock_after_failed_callback_and_bubbles()
             [
                 [
                     'sql'    => 'SELECT GET_LOCK({quoted-somelock}, 2)',
-                    'result' => [['1']]
+                    'result' => [[1]]
                 ],
                 [
                     'sql'    => 'SELECT RELEASE_LOCK({quoted-somelock})',
-                    'result' => [['0']]
+                    'result' => [[0]]
                 ],
             ]
         );