As of #7663, an in-memory store was used in place of local storage
during e2e tests, to facilitate the use of state fixtures. However,
this made it difficult to export state during a test run. The
instructions for exporting state to create fixtures assumed that local
storage was being used.
A new global function has been added to the background context to allow
exporting state. This method is available during testing and
development, and it works with either local storage or the in-memory
store. The fixture instructions have been updated to reference this new
function.
* Add network store for testing
An alternative persistent state store has been created for use with e2e
tests. Instead of reading state from disk, it tries to load state from
a local fixture server running on port `12345` and serving state from
the path `/state.json`, and returns a blank state otherwise.
* Add e2e test fixture server
A fixture server has been added for serving background state, which the
background will read upon startup as part of restoring persisted state.
The `signature-request` e2e test has been updated to use a fixture to
bypass the registration step. The fixture used (`imported-account`) was
generated by pausing midway through that test run
