Acquire test user access tokens for integration tests

[zzvara]

Automated testing of integrations may require ad-hoc test users and access tokens created by parallel processes. Is there any support for test user generation and access token retrieval, and if not, do you plan to add these features?

[nbartels]

Yes, test users are supported. We have a special TestUser type for this and you can use RestFB to implement the calls described here: https://developers.facebook.com/docs/graph-api/reference/app/accounts/test-users#publish

If you need further information or example codes, please let me know.

[zzvara]

@nbartels thank you for your kind response. Could you provide or point me to a schematic code snippet to start with? Do you have tests regarding this feature in restfb?

[nbartels]

I'll push an integration test later on (today), so you can start with that.

[nbartels]

Please check the commit, you should find the information to create and delete test users there.

[zzvara]

@nbartels looks nice, I'm going to try it out ASAP!

[zzvara]

I'm getting an exception:

Received Facebook error response of type OAuthException: Invalid OAuth access token. (code 190, subcode null) 'null - null'
com.restfb.exception.FacebookOAuthException: Received Facebook error response of type OAuthException: Invalid OAuth access token. (code 190, subcode null) 'null - null'
	at com.restfb.exception.generator.DefaultFacebookExceptionGenerator$DefaultGraphFacebookExceptionMapper.exceptionForTypeAndMessage(DefaultFacebookExceptionGenerator.java:174)
	at com.restfb.exception.generator.DefaultFacebookExceptionGenerator.throwFacebookResponseStatusExceptionIfNecessary(DefaultFacebookExceptionGenerator.java:61)
	at com.restfb.DefaultFacebookClient.makeRequestAndProcessResponse(DefaultFacebookClient.java:794)
	at com.restfb.DefaultFacebookClient.makeRequest(DefaultFacebookClient.java:721)
	at com.restfb.DefaultFacebookClient.publish(DefaultFacebookClient.java:331)
	at com.restfb.DefaultFacebookClient.publish(DefaultFacebookClient.java:350)

This is how the client is created:

val client = new DefaultFacebookClient(secret, Version.LATEST)

And how publish is used:

    val accessToken = zuckerberg.client
      .publish(
        identifier + "/accounts/test-users",
        classOf[TestUser],
        Parameter.`with`("installed", true)
      ).getAccessToken

It seems to be working with calls like:

      val extendedAccessToken = client.obtainExtendedAccessToken(identifier, secret, accessToken)
      extendedAccessToken.getAccessToken

[nbartels]

You need the app access token for this call: https://developers.facebook.com/docs/facebook-login/access-tokens/#apptokens

[zzvara]

I can see it now, it works! Isn't this a bit confusing to use different keys for different use-cases with the same DefaultFacebookClient constructor waiting for an accessToken?

[nbartels]

You may have several FacebookClient instances 😉

You could simply add the app access token facebook client in a base test class and create the testuser client in the Before method - as an example.

Facebook uses several access tokens and so we developer have to handle that ...

[zzvara]

Facebook uses several access tokens and so we developer have to handle that ...

I see, thanks!