How to apply common assertions at Project or Suite Level

One workaround that I have found is ,

Write a groovy class with what ever assertions methods that you want to include , compile , make a jar of it and place to the {{..SmartBear\SoapUI-5.2.1\bin\ext}} folder of your soapui installation.

Restart your soapui

Go to the request step and add a script assertions, where import the groovy class and invoke the assertion method you have written, you may pass and context variable available like log, messageExchange etc ..

If you have many request steps, this will still have to be added to each and every if those needs to be tested , but certainly avoid or reduce writing or adding same type of assertions manually to each and every request step.

If you know any better approach , pls do let me know 

Thanks

Musaffir