Avoid common test smells

Many common smells have catchy names - learn them so you can recognise and avoid them.

• MD5Sum test - Test that largely duplicates the code's logic within the test
• Mystery Guest - Test that pulls in some external component - e.g a database either directly or indirectly via global state
• Loudmouth - Test clutters the console with debug messages
• General Fixture - Fixture (i.e setup data) that is too large with individual tests using only part of it
• Verbose Test - A long (in terms of LOC) test
• Eager Test - A test that is verifying too much
• Obscure Test - A test that cannot be understood at a glance
• Irrelevant Information - A test that exposes lots of irrelevant details