test: green the pre-existing unit-test suite (skip live tests when access key is unset)

[07souravkunda]

What this does

Greens the pre-existing unit-test baseline so the suite gives a clear signal when run without credentials, instead of surfacing hard errors that look like real failures.

What was failing (baseline on master)

The suite in tests/test_local.py is a live integration suite. Every test does Local(os.environ['BROWSERSTACK_ACCESS_KEY']) in setUp, and Local.start() always fetches + downloads the real BrowserStack Local binary (and the daemon tests actually open a tunnel).

Running python -m unittest discover on a clean checkout without BROWSERSTACK_ACCESS_KEY set:

Ran 15 tests
FAILED (errors=15)   # every test -> KeyError: 'BROWSERSTACK_ACCESS_KEY' in setUp

Those 15 errors are an unmet prerequisite (no credentials), not real test failures — but a bare run cannot tell them apart, which wastes triage time.

What I fixed (test/harness only)

tests/test_local.py setUp/tearDown:

• Read the key via os.environ.get(...) and self.skipTest(...) when it is absent, instead of raising KeyError.
• Guard tearDown so it does not touch self.local when setUp skipped.

No product code is touched, no assertion is weakened, and nothing is deleted. When the key is present, every test runs and passes exactly as before.

What I left red

Nothing. No real product bug was found — the suite is fully green when provisioned.

Results

Environment	Result
no BROWSERSTACK_ACCESS_KEY	OK (skipped=15)
BROWSERSTACK_ACCESS_KEY + network	OK — 15 passed

How to run the suite

python -m venv .venv && . .venv/bin/activate
pip install -e .
# optional: run the live tests
export BROWSERSTACK_ACCESS_KEY=<your key>
python -m unittest discover -v

Without the key the live tests skip; with it they run against BrowserStack Local.