Add bokeh server tests

[philippjfr]

We should some tests for bokeh server, a server can easily be started programmatically and using a client we can perform various tests to ensure it is working correctly.

[philippjfr]

These are getting more and more crucial as there have been some high-profile regressions. The main things to test are:

• Stream callbacks are processed correctly
• Bokeh models are updated appropriately
• Ranges are processed correctly

[jlstevens]

I agree this is very important but we should get regular notebook tests running on the improved testing infrastructure before we tackle this. We don't want to tackle too much testing infrastructure at once as it is a right pain to set up.

Ideally we would also have a way of testing linked streams in live notebooks independent of bokeh server...

[philippjfr]

Ideally we would also have a way of testing linked streams in live notebooks independent of bokeh server...

Notebook based callbacks do not use the same codepaths as server based ones, so those are independent problems.

[jlstevens]

Right, I am just mentioning another type of test I would also like...

[philippjfr]

We now have a number of bokeh server tests.

[jlstevens]

Happy to see this closed but maybe a new issue should be opened suggested tests for linked streams in notebooks?

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