test(toolkit): watch tests

[kaizencc]

tests for watch

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[kaizencc]

i'm frustrated but this is all i can think of at the moment. the problem is this:

1. the right thing to do here is to mock toolkit.deploy but that just... doesn't work.

const mockDeploy = jest.fn();
toolkit.deploy = mockDeploy;
expect(mockDeploy).toHaveBeenCalled();

I can see that toolkit.deploy is called normally, and then not called when it is mocked. But jest refuses to show that mockDeploy has been called.

2. in the current state of things, fakeChokidaorWatcherOn.readyCallback() triggers watch to in turn invoke deploy. But that all happens asynchronously, and ioHost.notifySpy does not get the right messages since there's nothing to await. Just waiting for 3 seconds cannot be the best thing to do here, but my gut tells me that we want to figure out how to do 1), and then this point will be moot

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: a55ecd8
• Result: FAILED
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.49%. Comparing base (61e876b) to head (a55ecd8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33040   +/-   ##
=======================================
  Coverage   81.49%   81.49%           
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  Files         224      224           
  Lines       13755    13755           
  Branches     2413     2413           
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  Hits        11209    11209           
  Misses       2273     2273           
  Partials      273      273           

Flag	Coverage Δ
suite.unit	81.49% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	80.85% <ø> (ø)
packages/aws-cdk-lib/core	82.15% <ø> (ø)