Regression test for empty command segfault (CDRIVER-2431)

Author: jmikola

tests/manager/manager-executeCommand_error-004.phpt

@@ -0,0 +1,23 @@
+--TEST--
+MongoDB\Driver\Manager::executeCommand() with empty command document
+--SKIPIF--
+<?php require __DIR__ . "/../utils/basic-skipif.inc"; ?>
+<?php NEEDS('STANDALONE'); ?>
+--FILE--
+<?php
+require_once __DIR__ . "/../utils/basic.inc";
+
+$manager = new MongoDB\Driver\Manager(STANDALONE);
+$command = new MongoDB\Driver\Command([]);
+
+echo throws(function() use ($manager, $command) {
+    $manager->executeCommand(DATABASE_NAME, $command);
+}, 'MongoDB\Driver\Exception\InvalidArgumentException'), "\n";
+
+?>
+===DONE===
+<?php exit(0); ?>
+--EXPECT--
+OK: Got MongoDB\Driver\Exception\InvalidArgumentException
+Empty command document
+===DONE===