Update v1.0.6.5

vendor/phpspec/prophecy/src/Prophecy/Promise/ReturnArgumentPromise.php

@@ -37,10 +37,10 @@ class ReturnArgumentPromise implements PromiseInterface
     public function __construct($index = 0)
     {
         if (!is_int($index) || $index < 0) {
-            throw new InvalidArgumentException(
+            throw new InvalidArgumentException(sprintf(
                 'Zero-based index expected as argument to ReturnArgumentPromise, but got %s.',
                 $index
-            );
+            ));
         }
         $this->index = $index;
     }

vendor/phpspec/prophecy/src/Prophecy/Promise/ThrowPromise.php

@@ -46,13 +46,13 @@ class ThrowPromise implements PromiseInterface
              && !is_subclass_of($exception, 'Exception')) {
                 throw new InvalidArgumentException(sprintf(
                     'Exception class or instance expected as argument to ThrowPromise, but got %s.',
-                    gettype($exception)
+                    $exception
                 ));
             }
         } elseif (!$exception instanceof \Exception) {
             throw new InvalidArgumentException(sprintf(
                 'Exception class or instance expected as argument to ThrowPromise, but got %s.',
-                gettype($exception)
+                is_object($exception) ? get_class($exception) : gettype($exception)
             ));
         }