infra: add offline unit tests

[math411]

Issue #, if available:

Description of changes: On a plane and cannot connect to wifi? Developing new Quantum circuits in the middle of the woods and want to add in your code? Waterproofed your laptop for scuba diving but forgot an ethernet cable?

This code is being added so testing can be done without a stable internet connection in place. These tests are no considered acceptable for fully testing the code but can give a user some sense of confidence with changes.

Testing done:

Merge Checklist

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General

• [ ] I have read the CONTRIBUTING doc
• [ ] I used the commit message format described in CONTRIBUTING
• [ ] I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• [ ] I have added tests that prove my fix is effective or that my feature works (if appropriate)
• [ ] I have checked that my tests are not configured for a specific region or account (if appropriate)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (d5580dc) to head (66b846a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #939 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 133 133 Lines 8901 8901 Branches 2004 2004 ========================================= Hits 8901 8901 ```

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