Test Sanitizers

Certain actions in Deno create resources in the resource table (learn more here).

For each test definition, the test runner checks that all resources created in this test have been closed. This is to prevent resource ‘leaks’. This is enabled by default for all tests, but can be disabled by setting the boolean to false in the test definition.

There’s also the exit sanitizer which ensures that tested code doesn’t call signaling a false test success.