Skip testBackupStaticAttributes until upstream fix

testBackupStaticAttributes() breaks because Prophecy-1.1 slightly
changed the name generation for generated classes. This change is
incompatible with PHPUnit's "@backupStaticAttributes enabled".

I'll skip this test until PHPUnit#2016 is resolved and will adapt that
fix here as well.

See also: phpspec/prophecy@694dc32
See also: sebastianbergmann/phpunit#2016

Author: malkusch

tests/PHPProphetTest.php

@@ -46,4 +46,14 @@ protected function defineFunction($namespace, $functionName)
     {
         PHPProphet::define($namespace, $functionName);
     }
+
+    /**
+     * This test is skipped until PHPUnit#2016 is resolved.
+     *
+     * @see https://github.com/sebastianbergmann/phpunit/issues/2016
+     */
+    public function testBackupStaticAttributes()
+    {
+        $this->markTestSkipped("Skip until PHPUnit#2016 is resolved");
+    }
 }