* Move compose.* tests to own namespace
* Ignore "@instance..." part of username when computing status length
In a status with a mention ("@foo@example.org") only the "@foo" part should
be included in the calculated status length. It wasn't, so the app was
prevening people from posting statuses that should have been allowed.
Fix this.
- Lift the length calculation code in to a separate static function (easier
and faster to test)
- Add a `MentionSpan` type, to reuse existing code for detecting mentions
- Fix a bug in `FakeSpannable.getSpans()` (it was returning the outer type,
not the wrapped inner span)
- Add additional fast tests
The tests made sense under the `components.compose.ComposeActivity` package,
so I also created that and moved the existing ComposeActivity tests there.
Fixes https://github.com/tuskyapp/Tusky/issues/3339
* Static import assertEquals
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