Discuss the advantages and disadvantages of each type of testing. When is each type of testing appropriate? Are there situations that preclude the use of a particular type of testing? A substantive post will do at least two of the following: 

Ask an interesting, thoughtful question pertaining to the topic
Provide extensive additional information on the topic
Explain, define, or analyze the topic in detail
Share an applicable personal experience
Provide an outside source that applies to the topic
Make an argument concerning the topic