This is an important update from Salesforce in Spring 2015 release.
Rather than re-phrasing the same theory again, I am just sharing an article explaining this awesome annotation @testSetup to be used for Test Classes.
The below link has everything needed to know as a part of this feature.
This blog explains the details about changing the ways of doing that business. That is understand well and doing some different process. Provides he best output of others. Thanks for this blog.
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