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# Feature Policy Guide
## How to Test a New Feature with Feature Policy
This directory contains a framework to test features with feature policy.
When adding a new feature to feature policy, the following cases should be tested:
* feature enabled by header policy [HTTP tests]
+ test when feature is enabled by feature policy HTTP header;
* feature disabled by header policy [HTTP tests]
+ test when feature is disabled by feature policy HTTP header;
* feature enabled on self origin by header policy [HTTP tests]
+ test when feature is enabled only on self origin by feature policy HTTP
header.
* feature allowed by container policy (iframe "allow" attribute);
+ test when feature is enabled by iframe "allow" attribute on self and cross
origins.
* feature allowed by container policy, redirect on load.
+ test when feature is enabled by iframe "allow" attribute when the iframe
is being redirected to a new origin upon loading
### How to Use the Test Framework
Use `test_feature_availability()` defined in
`/feature-policy/resources/featurepolicy.js`. Please refer to the comments
in `/feature-policy/resources/featurepolicy.js` for how this function works.
### How to Write Header Policy Tests
HTTP tests are used to test features with header policy.
* Define the header policy in `<feature-name>-<enabled | disabled | enabled-on-self-origin>-by-feature-policy.https.sub.html.headers`. Example:
Feature-Policy: feature-name *
* In `<feature-name>-<enabled | disabled | enabled-on-self-origin>-by-feature-policy.https.sub.html`:
* test if feature is enabled / disabled in the main frame;
* test if feature is enabled / disabled in a same-origin iframe;
* test if feature is enabled / disabled in a cross-origin iframe.
Examples:
`/feature-policy/payment-disabled-by-feature-policy.https.sub.html`
`/feature-policy/payment-disabled-by-feature-policy.https.sub.html.headers`
### How to Write Container Policy Tests
Simply use `test_feature_availability()` with the optional argument
`feature_name` specified to test if:
* feature is enabled / disabled in a same-origin iframe;
* feature is enabled / disabled in a cross-origin iframe.
Example:
`/feature-policy/payment-allowed-by-feature-policy-attribute.https.sub.html`
### How to Write Container Policy Tests with Redirect
Similar to the section above, append
`/feature-policy/resources/redirect-on-load.html#` to the argument `src`
passed to `test_feature_availability()`.
Example:
`/feature-policy/payment-allowed-by-feature-policy-attribute-redirect-on-load.https.sub.html`