Tracker for additional unit tests

## Type of Issue

Select the type of issue:
- [ ] Bug report (to report a bug)
- [ ] Feature request (to request an additional feature)
- [x] Tracker (I am just using this as a tracker)
- [ ] Refactor request
- [ ] Documentation Ask

## Checklist

Starting this tracker for list of functions to add unit tests for. If you see any failures after the refactor, please add to this list (and the PR fixing the issue should add the test):
- [x] `build_random_shape` in craftassist's `default_behavior`
- [ ] test handle_dig (PR: https://github.com/facebookresearch/droidlet/pull/540)
- [ ] Interpreter:
- [x] attribute_helper (PR: https://github.com/facebookresearch/droidlet/pull/510)
- [x] interpret_span_value
- [x] maybe_specific_mem
- [x] interpret_linear_extent
- [x] interpret_task_info
- [ ] comparator_helper.py
- [ ] interpret_comparator
- [x] #639
- [ ] get_memory_handler
- [ ] interpreter_utils
- [ ] location_helpers
- [ ] reference_object_helpers
- [ ] craftassist folder:
- [ ] block_helpers
- [ ] dance.py
- [x] default_behaviors
- [ ] facing_helper
- [ ] point_target
- [ ] schematic_helper
- [ ] size_words
- [ ] spatial_reasoning
- [ ] modify_helpers
- [ ] locobot
- [ ] dance
- [ ] default_behaviors
- [ ] facing_helper
- [ ] point_target
- [ ] get_memory_handler
- [ ] spatial_reasoning
- [ ]