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There is a bank service that provides API to do some operations with bank accounts. To perform a request to all endpoints of this service I, first of all, need to get auth token via grand_type=auth_code; I can easily get the auth code and then access token manually. When browser redirects me to bank auth page I just enter my credentials and then It redirects me to my predefined URL with auth_code.

But I need to write unit tests for my implementation of this API. And how can I perform this process with entering credentials and send request from the page programmatically to get auth code?

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You can try to use Selenium WebDriver to automate the flow.

I recently did exactly that - automated integration tests calling bank API protected by OAuth and it took me only few hours to get it to work.

Basically You run a real browser and drive interaction with web page from Java code replicating manual interaction.

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