Create a test suite for testing inputs in a language agnostic manner

[kvch]

The goal of this task is to provide a suite for testing inputs to validate that it can be controlled by Elastic Agent and can forward events to the shipper. The test suite should rely on the testing package of Golant.

Requirements

• The tester must be able to test an input regardless of its language (e.g. input can be written in Python)
• The tester must check if the input understands the control protocol
• The tester must check if the input can ship events using the shipper protocol

Test cases

Control protocol

• Reports OK if correct configuration is sent
• Reports Error if incorrect configuration is sent
• Can start with correct configuration
• Can be stopped when running in healthy state
• Can be killed if running in degraded state

Shipper

• Can publish events to the shipper
• Can handle publishing errors

[cmacknz]

Adding in a comment from a previous issue since I still like the idea:

Rather than a framework or a separate test suite an interesting idea would be to just build these tests and validation steps into the agent (and perhaps shipper) themselves.

We could have a command for the agent that determines whether some binary can be run by the agent for example and prints out a compatibility report.