In a move that will infuriate the UK's biggest retailer, the commission this week pledged that despite Tesco's historic appeal victory, it would press ahead with its test.
Since March the commission has carried out further research into the benefits of the test.
"Our analysis has shown that the test is likely to have a positive effect over time for consumers by ensuring that they benefit from greater competition and choice between retailers in their local areas," said commission chairman Peter Freeman.
The commission's decision will now be put out to consultation before a final decision in October. Tesco will have the option to appeal against the verdict.