Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/phpspec/prophecy/spec/Prophecy/Prediction/NoCallsPredictionSpec.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace spec\Prophecy\Prediction;
+
+use PhpSpec\ObjectBehavior;
+
+class NoCallsPredictionSpec extends ObjectBehavior
+{
+    function it_is_prediction()
+    {
+        $this->shouldHaveType('Prophecy\Prediction\PredictionInterface');
+    }
+
+    /**
+     * @param \Prophecy\Prophecy\ObjectProphecy $object
+     * @param \Prophecy\Prophecy\MethodProphecy $method
+     */
+    function it_does_nothing_if_there_is_no_calls_made($object, $method)
+    {
+        $this->check(array(), $object, $method)->shouldReturn(null);
+    }
+
+    /**
+     * @param \Prophecy\Prophecy\ObjectProphecy    $object
+     * @param \Prophecy\Prophecy\MethodProphecy    $method
+     * @param \Prophecy\Call\Call                  $call
+     * @param \Prophecy\Argument\ArgumentsWildcard $arguments
+     */
+    function it_throws_UnexpectedCallsException_if_calls_found($object, $method, $call, $arguments)
+    {
+        $method->getObjectProphecy()->willReturn($object);
+        $method->getMethodName()->willReturn('getName');
+        $method->getArgumentsWildcard()->willReturn($arguments);
+        $arguments->__toString()->willReturn('123');
+
+        $call->getMethodName()->willReturn('getName');
+        $call->getArguments()->willReturn(array(5, 4, 'three'));
+        $call->getCallPlace()->willReturn('unknown');
+
+        $this->shouldThrow('Prophecy\Exception\Prediction\UnexpectedCallsException')
+            ->duringCheck(array($call), $object, $method);
+    }
+}