Create option to silence duplicate outputs when using multiple asserts on a test

[bfrymire]

While it's generally best to have a single assertion testing a single function, there are times where it's advantageous having multiple assertions on a test. When multiple assertions are on a test, each assertion creates a log which is then output at the end of all the tests. This can create duplicate outputs for the same test and may be confusing for the user.

Create an option for the user to silence duplicate outputs for a single test in the event there is no error.