From e06125e58da8ad495ffa61840bc6cc57defcc96f Mon Sep 17 00:00:00 2001
From: Andrii Vasyliev <sol@hiqdev.com>
Date: Fri, 26 Jul 2019 11:01:35 +0200
Subject: [PATCH] Fixed getting alternatives

---
 src/Plugin.php                               |  4 +++-
 src/exceptions/BadConfigurationException.php | 20 ++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 src/exceptions/BadConfigurationException.php

diff --git a/src/Plugin.php b/src/Plugin.php
index 099cf50..9c8ef47 100644
--- a/src/Plugin.php
+++ b/src/Plugin.php
@@ -200,8 +200,10 @@ protected function processPackage(Package $package)
             $alternatives = $package->getAlternatives();
             if (is_string($alternatives)) {
                 $this->alternatives = $this->readConfig($package, $alternatives);
-            } else {
+            } elseif (is_array($alternatives)) {
                 $this->alternatives = $alternatives;
+            } elseif (!empty($alternatives)) {
+                throw new BadConfigurationException('alternatives must be array or path to configuration file');
             }
         }
 
diff --git a/src/exceptions/BadConfigurationException.php b/src/exceptions/BadConfigurationException.php
new file mode 100644
index 0000000..680acf0
--- /dev/null
+++ b/src/exceptions/BadConfigurationException.php
@@ -0,0 +1,20 @@
+<?php
+/**
+ * Composer plugin for config assembling
+ *
+ * @link      https://github.com/hiqdev/composer-config-plugin
+ * @package   composer-config-plugin
+ * @license   BSD-3-Clause
+ * @copyright Copyright (c) 2016-2018, HiQDev (http://hiqdev.com/)
+ */
+
+namespace hiqdev\composer\config\exceptions;
+
+/**
+ * Bad configuration exception.
+ *
+ * @author Andrii Vasyliev <sol@hiqdev.com>
+ */
+class BadConfigurationException extends Exception
+{
+}