[Test] Added UI test for the new stats traffic tab.

[notandyvee]

Fixes #20001

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This PR adds a new UI test, StatsNewTests. It tests simply that we can reach to the new stats traffic tabs and that there are the two default tabs.

In order to get it working I needed a way to toggle feature flags in UI tests. At first I tried using Wiremock options. But required some workarounds. I found a better way, WireMockServer.stubFor. You can find more documentation here. Apparently you can match against a specific url (/wpcom/v2/mobile/feature-flags/) and force return specific responses.

I tried making it a TestRule, but I needed access to WireMockRule. But it wouldn't work in a separate TestRule. The documentation isn't very large for android specifically. So for now I opted to simply pass in the feature file in BaseTest constructor.

To Test:

• Run StatsNewTests on any emulator. Should pass.
• Run StatsTests on any emulator. Should pass.
• Run all UI tests to make sure no regressions were introduced.

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Regression Notes

1. Potential unintended areas of impact

   N/A

2. What I did to test those areas of impact (or what existing automated tests I relied on)

   Ran UI tests.

3. What automated tests I added (or what prevented me from doing so)

   Added new simple UI test, StatsNewTests.

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PR Submission Checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[dangermattic]

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[notandyvee]

Ok @irfano I kept it simple and added a simple new class, WireMockStub. This will hold a reference of a url path to match and a file name. We can loop through them and stub them in the BaseTest constructor.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[irfano]

Thank you for adding the feature alternative endpoint responses. It will help enhance our UI tests.
LGTM! 👍🏻

[irfano]

We can also send a list. Nice!

[irfano]

@notandyvee, I noticed that StatsGranularTabsTest has been flaky since we re-enabled it. I'm informing you because we might consider disabling it soon and monitoring whether the new StatsTest will also behave flaky or not.

[notandyvee]

Thank you @irfano . I am aware of that. I created an issue to add retry mechanism since the bug seems to be a card loading issues. Retrying would help mitigate some of it since i was not able to reproduce it that often locally. But good call out.