Custom WebDriverAgent installation

[jobeylev]

Hi, I need to sign and deploy WebDriverAgent as a standalone IPA, so that our engineers can install WDA onto iPhones connected to their windows machines. I managed to create what I think is a valid IPA, and my test engineers are able to install it from Windows to their iPhones. However, when they try to run WDA, they get this error:

WebDriverAgentRunner-Runner[78215:3278635] Failed to retrieve test configuration from IDE. Exiting. Error: (null)

This error does not occur if I run the same IPA on an iPhone that already has our in-house signed WDA installed. I suspect this means Xcode does something magical to it, adding some configuration that's otherwise missing?

Is this related to the --xctestconfig setting on the runwda command? Perhaps I don't understand how this is used. I use it to point to the WebDriverAgentRunner.xctest plugin. If that's not right, can you tell me what kind of file it should be pointing to, and how I can generate a file like that?