I enjoyed tests as a child--I saw them as a game.  So far my children are the same way. 

Just for fun I had them do a couple of reading assessments last year about this time.  We did the same two tests this year and it was fun to see that each child had jumped up two grade levels on this particular facet of reading skills.  These two tests are just word decoding and pronunciation.  They don't test for vocabulary or comprehension/retention. 

Here's a very quick little test.  We did the first one from the top of the web-page, the one that says, "Reading words - Decoding".

Here's the 2nd test my girls took.  It will open as a pdf file in Adobe.

If nothing else, they are kinda fun.