Second attempt at this, which should work. Stop trying to use
exposeFunction, which seems to work poorly on macOS webkit in CI, and
just run a server with HTTP endpoints to do the "RPC."
Reuses Alex's "yaserver" module that we were already using for other
tests. Uses a secure random prefix for security in each run.
Should fix the issue that @roblourens and @Yoyokrazy were hitting with snapshot tests on macOS WebKit in CI. Not pretty, but I'd rather do this than spend a bunch of time chasing down something that certainly seems to be a browser issue.
* eng: add support for snapshot tests
This adds Jest-like support for snapshot testing.
Developers can do something like:
```js
await assertSnapshot(myComplexObject)
```
The first time this is run, the snapshot expectation file is written
to a `__snapshots__` directory beside the test file. Subsequent runs
will compare the object to the snapshot, and fail if it doesn't match.
You can see an example of this in the test for snapshots themselves!
After a successful run, any unused snapshots are cleaned up. On a failed
run, a gitignored `.actual` snapshot file is created beside the
snapshot for easy processing and inspection.
Shortly I will do some integration with the selfhost test extension to
allow developers to easily update snapshots from the vscode UI.
For #189680
cc @ulugbekna @hediet
* fix async stacktraces getting clobbered
* random fixes
* comment out leak detector, for now
* add option to snapshot file extension
* move encoding logic from NativeTextFileService to AbstractTextFileService for #79275
* some cleanup things - just cosmetic
* fix tests
* review
* use correct comparison
Co-authored-by: Benjamin Pasero <benjpas@microsoft.com>
