Provide meaningful unit tests for store.ts

[samayer12]

Describe what should be investigated or refactored

store.ts on exposes a constructor and generally suffers from poor test-coverage. There are several instances of branching logic in that file that need test coverage.

Create some unit tests that execute some of the varying paths through store.ts and make meaningful assertions to aid someone who is digging into future issues with a Journey or E2E test. We'll know we're "done" with this when CodeCov reports a better coverage (say, 60% or greater?) percentage and the corresponding unit tests make meaningful assertions.

Links to any relevant code

Reference the existing skipped tests in store.test.ts (introduced by #1259) for a starting point.

Additional context