What are the testing and certification requirements for implementing EMV? What are some best practices for testing and certification?

Testing and certification of terminals is required by all payment networks.

At the Minimum EMV Chip Card and Terminal Requirements – U.S. page you will find a document produced by the EMV Migration Forum that is intended for use by U.S. issuers, merchants, acquirers, processors and vendors who are planning EMV migrations.

The EMV Testing and Certification White Paper: Current Global Payment Network Requirements for the U.S. Acquiring Community Version 2.0 lists the acquirer testing requirements for each of the four major brands: American Express, Discover, MasterCard and Visa.