build.security provides some easy-to-use features that enable you to streamline the policy creation process while minimizing any impact this might have on your users. As you create your policies, you will want to evaluate the impact they have on your organization and then, depending on the outcome, consider adjusting some or all of the policy rules as needed.
The policy evaluation playground enables you to initiate a dry run authorization request to one of your PDPs to test the changes that you've made in the policy rule in real time, regardless of the policy status. This area, accessed by clicking the policy evaluation playground icon, will open on the right side of the policies screen. (For more information, see Dry Run Evaluation.)
After entering the code you wish to evaluate in the Input window, you can select the PDP that you'd like to use for this evaluation, and then click EVALUATE.
The authorization decision that would be returned if an authorization request using this policy were initiated, will be displayed in the results area. In the policy evaluation playground you enter the input and see what the output (result) will be.
Alternatively, another invaluable way to test your policy is by using the build.security's policy unit testing capabilities, which enables you to enter both the input and expected output, and the platform will confirm whether the test passed (the two code units match) or fail (they do not match). For more information, see Policy Testing.
The "Use Cache" checkbox specifies whether the data-source's cache option should be enabled for the evaluation attempt. For more information, see Data Sources and review the data sources which support the caching option.
As of OPA version 0.25.0 - builtin functions that encounter errors are "silently" evaluate to false, instead of halting the policy evaluation process. Release notes about this change can be found here. In build.security's playground, "strict mode" is turned ON in order to identify and "throw" possible errors as soon as possible, much before these policies get deployed to production.
The policy evaluation playground can help reduce the time it takes you to author a policy by enabling you to "test-as-you-go." The evaluation calculation is performed with an active PDP instance, so before attempting to use this feature, you should first verify that you have an active PDP configured.