Specify a list of resources that are locked by this test.

If multiple tests specify the same resource lock, they are guaranteed not to run concurrently.

See also FIXTURES_REQUIRED if the resource requires any setup or cleanup steps.

Both the RESOURCE_GROUPS and RESOURCE_LOCK properties serve similar purposes, but they are distinct and orthogonal. Resources specified by RESOURCE_GROUPS do not affect RESOURCE_LOCK, and vice versa. Whereas RESOURCE_LOCK is a simpler property that is used for locking one global resource, RESOURCE_GROUPS is a more advanced property that allows multiple tests to simultaneously use multiple resources of the same type, specifying their requirements in a fine-grained manner.