throw exception when key is missing

src/ClientTrait.php

@@ -62,8 +62,6 @@ private function getConnectionType(array $config)
                     'composer require google/proto-client-php'
                 );
             }
-
-            return $transport;
         }
 
         return $transport;

src/GrpcTrait.php

@@ -60,14 +60,20 @@ public function send(callable $request, array $args)
     /**
      * Pluck a value out of an array.
      *
-     * @param string $name
+     * @param string $key
      * @param array $args
      * @return string
      */
-    public function pluck($name, array &$args)
+    public function pluck($key, array &$args)
     {
-        $value = $args[$name];
-        unset($args[$name]);
+        if (!isset($args[$key])) {
+            throw new \InvalidArgumentException(
+                "Key $key does not exist in the provided array."
+            );
+        }
+
+        $value = $args[$key];
+        unset($args[$key]);
         return $value;
     }
 }

tests/GrpcTraitTest.php

@@ -69,4 +69,13 @@ public function testPluck()
         $this->assertEquals($value, $actualValue);
         $this->assertEquals([], $array);
     }
+
+    /**
+     * @expectedException \InvalidArgumentException
+     */
+    public function testPluckThrowsExceptionWithInvalidKey()
+    {
+        $array = [];
+        $actualValue = $this->implementation->pluck('not_here', $array);
+    }
 }