Increase code coverage.

Author: drupol

spec/drupol/phptree/Importer/TextSpec.php

@@ -42,6 +42,11 @@ public function it_can_import()
             ->import($string)
             ->isRoot()
             ->shouldReturn(TRUE);
+
+        $this
+            ->import($string)
+            ->getValue()
+            ->shouldReturn('root ');
     }
 
     public function it_can_throw_an_error_when_cannot_import()