reset commands when parsing new arguments

Author: tflori

src/Commands.php

@@ -28,6 +28,7 @@ public function addCommand(Command $command)
 
     public function parse($arguments = null)
     {
+        $this->command = null;
         parent::parse($arguments);
 
         if (count($this->getOperands()) > 0) {

tests/Commands/ParseTest.php

@@ -76,4 +76,15 @@ public function testStoresTheCalledCommand()
 
         self::assertSame($command, $commands->getCommand());
     }
+
+    public function testResetsTheCommand()
+    {
+        $commands = new Commands();
+        $commands->addCommand(new Command('help', 'Show the help for command', 'var_dump'));
+        $commands->parse('help');
+
+        $commands->parse('');
+
+        self::assertNull($commands->getCommand());
+    }
 }