Use hardcoded ClientToken in UITests

[scannillo]

Summary of changes

• This PR updates our demo app settings to support using hard-coded/static ClientToken values versus fetching them in our UI tests
• The goal of this PR is to reduce UI test flakiness on CI by eliminating the client-token fetch network request
• Introduce DemoAuthType enum to mirror braintree_ios test setup

Checklist

• Added a changelog entry

Authors

@jaxdesmarais @scannillo

[scannillo]

Failing after 46m

Gonna 🦵 kick the UI tests again just to see how long it takes

[scannillo]

UI tests expected to fail

[jaxdesmarais]

It seems like the tests with the client tokens with customer IDs are failing with an "invalid auth fingerprint" error (such as the BraintreeDropIn_EditMode_UITests tests). I wonder if there is a different validation that happens when validating an auth fingerprint that includes a client ID? We may need to work with the authy team to get a long lived client token for UI tests that includes a customer ID or poke around at how Android/Web handles these UI tests. Alternatively we can go back to fetching a client token for the customer ID case, but I assume that'd still result in flaky tests.

[scannillo]

@jaxdesmarais It seems like the tests with the client tokens with customer IDs are failing with an "invalid auth fingerprint" error (such as the BraintreeDropIn_EditMode_UITests tests). I wonder if there is a different validation that happens when validating an auth fingerprint that includes a client ID? We may need to work with the authy team to get a long lived client token for UI tests that includes a customer ID or poke around at how Android/Web handles these UI tests. Alternatively we can go back to fetching a client token for the customer ID case, but I assume that'd still result in flaky tests.

Great catch! I was also able to replicate that locally. So I removed the DemoAuthType.uiTestHardcodedClientTokenWithCustomerID option and replaced the tests that used it with regular -ClientToken setting. The tests are now passing locally!

[jaxdesmarais]

🔥