I will always post the upcoming test and quiz dates on the board [in big, bold, colorful letters] in class giving the kids ample time to realize that it is approaching. I will also post the dates on the blog usually on the date that it is announced. For example, I will announce an upcoming test on Aug 16th to take place on Aug 21st. Therefore, the announcement will be posted on Aug 16th in BOLD.
When in doubt, or you just want further clarification, email me. I am more than happy to shoot a quick update on the class scheduling.