Add help command

Change-Id: Ifbda5a7aafefe396854c00add315fb7a67d4fb26
diff --git a/tests/command_completion.cpp b/tests/command_completion.cpp
index 21410c8..83ade0a 100644
--- a/tests/command_completion.cpp
+++ b/tests/command_completion.cpp
@@ -20,13 +20,13 @@
     SECTION("")
     {
         input = "";
-        expected = {"cd", "create", "delete", "set", "commit", "get", "ls", "discard"};
+        expected = {"cd", "create", "delete", "set", "commit", "get", "ls", "discard", "help"};
     }
 
     SECTION(" ")
     {
         input = " ";
-        expected = {"cd", "create", "delete", "set", "commit", "get", "ls", "discard"};
+        expected = {"cd", "create", "delete", "set", "commit", "get", "ls", "discard", "help"};
     }
 
     SECTION("c")