fix: mock webcontainer api and xterm for unit test

[cpaulve-1A]

Proposed change

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[kpanot]

Maybe cleaner to be set in the beforeEach to renew the mock before each test.
Or, if the single mock is done on purpose, maybe moving it outside of the describe as it is affecting globally.

(same comment for the other tests)

[kpanot]

Maybe more readable to move the both mocks on external testing/mocks/webcontainer-api.ts and testing/mocks/xterm-xtern.ts that you can import in this file?

[kpanot]

I was thinking:

// in webcontainer-api.mock.ts

class WebContainerApiMock {
  public static boot = jest.fn(() => Promise.resolve({
    on: jest.fn(() => jest.fn())
  }));
}
jest.mock('@webcontainer/api',
  () => ({
    WebContainer: WebContainerApiMock
  }), {
    virtual: true
  }
);

and in this file just:

import './mocks/webcontainer-api.mock';