This article explains if it is possible to use a passwordless flow for most users but bypass the flow for test accounts.

Resource Owner Password Grant (ROPG)

For accounts used to perform tests, a database connection with test users and credentials should be used.

• Configure the automated tests to fetch tokens using the Resource Owner Password Grant (ROPG), which involves one HTTP request to the /oauth/token endpoint.
• The remainder of the automated tests can be performed as an authenticated user.
• Imitating the flow of the actual connection type is not necessary (and in some cases is not possible) since all successful auth flows end with the application receiving tokens for the authenticated user.

Related References

• Resource Owner Password Grant (ROPG)