fix(tests): Fix cypress flakiness on CI by slowing down test setup

[adrienjoly]

Problem

Despite several attempts to improve the situation (see PRs #501, #504, #505, #507, #508, #510, #513, #520, #521, #522), Cypress tests are still flaky: they timeout for random reasons.

Hypothesis

This timeout could be caused by the fact that:

• some XHR requests (e.g. to /api/notif to fetch notifications, and Deezer) may never respond => onLoad is never triggered
• when a new test starts, we call /testing/reset to refresh the DB, which can cause pending DB queries from never resolving

See #520 (comment).

Proposed solution

• wait for Openwhyd server to be up and reset before running tests
• intercept and mock flaky XHR requests
• fail faster when test steps are hanging for too long
• reduce the amount of resources to load: fonts

[cypress]

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Test summary

25 • 0 • 1 • 0

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Run details

Project	Openwhyd
Status	Passed
Commit	22ea5b3 ℹ️
Started	Dec 26, 2021 5:18 PM
Ended	Dec 26, 2021 5:21 PM
Duration	03:13 💡
OS	Linux Ubuntu - 20.04
Browser	Chromium 96

View run in Cypress Dashboard ➡️

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication