Test a Decision Model Test your decision model to ensure it works as expected. In the decision designer, click Test Decision Model on the sidebar. In the Test Decision Model panel: Enter the input data manually. Or, use the Mode toggle to switch modes, and enter the input data as a JSON sample. Click Start Test. The panel displays the decision model's result. To view the outcome of a specific decision in the model, click the decision's name on the left. To repeat the test, click Go Back.