Add method signature to __call

Author: paulbalandan

phpstan-baseline.php

@@ -3526,11 +3526,6 @@
 	'count' => 1,
 	'path' => __DIR__ . '/system/Test/TestLogger.php',
 ];
-$ignoreErrors[] = [
-	'message' => '#^Method CodeIgniter\\\\Test\\\\TestResponse\\:\\:__call\\(\\) should return mixed but return statement is missing\\.$#',
-	'count' => 1,
-	'path' => __DIR__ . '/system/Test/TestResponse.php',
-];
 $ignoreErrors[] = [
 	'message' => '#^Property CodeIgniter\\\\Throttle\\\\Throttler\\:\\:\\$testTime \\(int\\) on left side of \\?\\? is not nullable\\.$#',
 	'count' => 1,

system/Test/TestResponse.php

@@ -479,15 +479,14 @@ public function assertSeeInField(string $field, ?string $value = null): void
     /**
      * Forward any unrecognized method calls to our DOMParser instance.
      *
-     * @param string $function Method name
-     * @param mixed  $params   Any method parameters
-     *
-     * @return mixed
+     * @param mixed[] $params
      */
-    public function __call($function, $params)
+    public function __call(string $function, array $params): mixed
     {
         if (method_exists($this->domParser, $function)) {
             return $this->domParser->{$function}(...$params);
         }
+
+        return null;
     }
 }