This PR adds some unit tests for the camera constraints API
I took educated guesses at the intended panning and zoom behaviour for
the editor's constraints. But I couldn't work out what the intended
behaviour was for a couple of the tests, so I've left these ones for
now:
```javascript
describe('Allows mixed values for x and y', () => {
it.todo('Allows different values to be set for x and y axes')
})
```
```javascript
describe('Contain behavior', () => {
it.todo(
'Locks axis until the bounds are bigger than the padded viewport, then allows "inside" panning'
)
})
```
I also edited some earlier tests so they now use chaining, to be
consistent with the other tests and hopefully easier to read.
### Change Type
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- [ ] `sdk` — Changes the tldraw SDK
- [ ] `dotcom` — Changes the tldraw.com web app
- [ ] `docs` — Changes to the documentation, examples, or templates.
- [ ] `vs code` — Changes to the vscode plugin
- [x] `internal` — Does not affect user-facing stuff
<!-- ❗ Please select a 'Type' label ❗️ -->
- [ ] `bugfix` — Bug fix
- [ ] `feature` — New feature
- [ ] `improvement` — Improving existing features
- [ ] `chore` — Updating dependencies, other boring stuff
- [ ] `galaxy brain` — Architectural changes
- [x] `tests` — Changes to any test code
- [ ] `tools` — Changes to infrastructure, CI, internal scripts,
debugging tools, etc.
- [ ] `dunno` — I don't know
### Test Plan
1. Add a step-by-step description of how to test your PR here.
2.
- [ ] Unit Tests
- [ ] End to end tests
### Release Notes
- Adds tests for the camera constraints api
fc302ec4a5