Add integration tests using WebdriverIO

[traeok]

Is your feature request related to a problem? Please describe.

Currently, our tests consist of unit tests and snapshots. We also have some Selenium tests for the Theia environment, but we don't have a set of integration tests for testing how the extension behaves within VS Code.

We might not be able to add these integration tests to our automated pipelines (as VS Code needs a display to show its UI), but it would help to run this locally when adding new features or addressing bugs to make sure that all features work as intended.

Describe the solution you'd like

Leverage the WebdriverIO framework to create a preliminary set of integration tests for Zowe Explorer.

Describe alternatives you've considered

I'm not aware of other frameworks for testing the user interface for VS Code extensions, but if an alternative exists, we should compare our options and pick the best framework for our use cases.

Tasks

Preview Give feedback

1. Click on the Zowe Explorer icon
2. Collapse and expand the favorites node in each tree view
3. Click the "+" button to open the "Add Profile/Config" quick pick
4. Toggle on/off tree views in Zowe Explorer pane
5. Configure Zowe Explorer in extension settings (section is visible)
6. "Edit Team Configuration File" option opens editor with config
7. Issue a TSO command through the Command Palette
8. Issue a MVS command through the Command Palette
9. Issue a Unix command through the Command Palette
10. Select multiple tree items without it breaking the selection (might be a VS Code issue)
11. Add profile to a single tree view
12. Add profile to all tree views
13. Expand and collapse a profile in each tree - verified
14. Expand and collapse a profile in each tree - unverified/no filter set
15. Multiple extensions can load the profile cache concurrently #2993
    Tests enhancement priority-medium +3
16. User can add a filter search on a session node in each tree
17. User can select an existing filter search in each tree
18. Data set can be opened in tree, edited, and saved
19. Favorited data set can be opened in tree, edited, and saved
20. Favorited PDS member can be opened in tree, edited, and saved
21. USS file can be opened in tree view, edited and saved
22. User can expand a USS directory in the tree view and select one of its files
23. User can expand a PDS in the tree view and select one of its members
24. PDS member can be opened in tree, edited, and saved

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[JTonda]

Test Plan:

• Set up framework
• Duplicate/model Thea tests - initial set of tests (not all inclusive)
• Add to PR checklist
• Documentation - Dev Docs

[traeok]

Here are the branches I've created for my research - each branch contains a sample test that uses the given framework.

WebdriverIO: test/wdio
ExTester: test/ExTester
Nightwatch.js: test/Nightwatch.js

Link to research: https://ent.box.com/s/m32dgpfnt5bvwsiuvxr85kesvh3ty8mn