[SalesForce] UNKNOWN_EXCEPTION -, portal account owner must have a role In Test class

You would need to create a test user which has a role defined, and then runas test user. With this all the account or contacts which are getting created will have Owner as this test user, and now when in your code the community user from your code it wont throw an error.

This test user is different from Community user, "test user" is just used to remedy the issue which you are facing in your test class.

I believe that it's not the system.runas() that is the problem here.

It's the Accounts that you created, and the Owner of the Accounts(whoever is running the unit test at the time), and those Owners Roles.

So I'd be debugging something more like: ListOfAccounts[0].Owner.UserRoleId < is this null? (Don't forget to re-soql the accounts after insert, otherwise this will always return null)

To specify the Account Owner, you can do it up creation, or use the system.runas command for the "insert dist1" line. The Owner also needs to be Active.

You can also debug: UserInfo.getUserRoleId() < this should be the Accounts Owners RoleId

Let me know if this points you in the direction you need!