fix redis tests

.travis.yml

@@ -42,6 +42,7 @@ cache:
 
 before_install:
     - echo "extension = mongodb.so" >> $HOME/.phpenv/versions/$(phpenv version-name)/etc/php.ini
+    - echo "extension = redis.so" >> $HOME/.phpenv/versions/$(phpenv version-name)/etc/php.ini
 
 install:
     - rm $HOME/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini;

pkg/redis/PRedis.php

@@ -30,6 +30,10 @@ class PRedis implements Redis
      */
     public function __construct(array $config)
     {
+        if (false == class_exists(Client::class)) {
+            throw new \LogicException('The package "predis/predis" must be installed. Please run "composer req predis/predis:^1.1" to install it');
+        }
+
         $this->options = $config['predis_options'];
 
         $this->parameters = [

pkg/redis/PhpRedis.php

@@ -19,6 +19,10 @@ class PhpRedis implements Redis
      */
     public function __construct(array $config)
     {
+        if (false == class_exists(\Redis::class)) {
+            throw new \LogicException('You must install the redis extension to use phpredis');
+        }
+
         $this->config = $config;
     }
 

pkg/redis/RedisConnectionFactory.php

@@ -95,16 +95,8 @@ private function createRedis(): Redis
     {
         if (false == $this->redis) {
             if (in_array('phpredis', $this->config['scheme_extensions'], true)) {
-                if (false == class_exists(\Redis::class)) {
-                    throw new \LogicException('You must install the redis extension to use phpredis');
-                }
-
                 $this->redis = new PhpRedis($this->config);
             } else {
-                if (false == class_exists(\Predis\Client::class)) {
-                    throw new \LogicException('The package "predis/predis" must be installed. Please run "composer req predis/predis:^1.1" to install it');
-                }
-
                 $this->redis = new PRedis($this->config);
             }