allow to disable cache when running tests in browser

[gr2m]

Current behavior:

When testing 301 redirect behavior that differs based on passed headers the tests will fail after first run because a browser caches 301 redirects

Desired behavior:

It would be nice to test each run in isolation by disabling the browser cache

How to reproduce:

https://github.com/gr2m/cypress-test-tiny/tree/cypress-1315

Test code:

See link to repository above

Additional Info (images, stack traces, etc)

Browser redirects based on cached 301 redirect

Which makes test fail

Test pass when "disable cache" flag is checked (in the network tab of developer tools)

• Operating System: Mac OS 10.11
• Cypress Version:
  • Cypress package version: 1.4.2
  • Cypress binary version: 1.4.2
• Browser Version: Chrome 64.0.3282.140

[brian-mann]

This is true. We intend to do this as part of the Lifecycle Events Epic. #686

We also just closed an issue today related to this - we are now clearing the cache once when the browser is launched - but not in between tests. We'll do that as per the Lifecycle events.

#1124

As for testing this today - there's not really any reason to do a browser test to do this as per your repo - you can just use cy.request() or just an API test for this.

[gr2m]

Thanks feel free to close if you like, I worked around the issue in my case.

[jennifer-shehane]

Was just reminded that cy.reload(true) should reload the page without using the cache. May be a solution for some. https://on.cypress.io/reload#Requirements