Fixes

Author: GrahamCampbell

spec/FlexibleHttpClientSpec.php

@@ -32,11 +32,11 @@ public function it_is_an_async_http_client()
         $this->shouldImplement(HttpAsyncClient::class);
     }
 
-    public function it_throw_exception_if_invalid_client()
+    public function it_throw_type_error_if_invalid_client()
     {
         $this->beConstructedWith(null);
 
-        $this->shouldThrow(\LogicException::class)->duringInstantiation();
+        $this->shouldThrow(\TypeError::class)->duringInstantiation();
     }
 
     public function it_emulates_an_async_client(

src/PluginClientFactory.php

@@ -47,6 +47,12 @@ public static function setFactory(callable $factory)
      */
     public function createClient($client, array $plugins = [], array $options = []): PluginClient
     {
+        if (!$client instanceof ClientInterface && !$client instanceof HttpAsyncClient) {
+            throw new \TypeError(
+                sprintf('%s::createClient(): Argument #1 ($client) must be of type %s|%s, %s given', self::class, ClientInterface::class, HttpAsyncClient::class, get_debug_type($client))
+            );
+        }
+
         if (static::$factory) {
             $factory = static::$factory;