Write tests for cam-pipeline

[gaurav]

Probably the simplest way of doing this would be to add tests to Souffle so that invalid or suspicious edges are reported somewhere (e.g. any edge that isn't mapped to a Biolink predicate).

We should also set up a test kit in this repository that can query the TRAPI endpoint and confirm that it is working correctly. We have code for doing that in https://github.com/ExposuresProvider/cam-kp-api/, so we could try moving that over in Scala/ZIO or rewriting it into Souffle/Python/something simple.

[gaurav]

Moving over the existing code is going to be a pain, because it has deep dependencies with ZIO testing, Circe and the code in cam-kp-api that models the TRAPI messages.

Instead, I think the right approach needs to be:

1. Use https://automat.renci.org/cam-kp/1.4/sri_testing_data to download example data.
2. Build a Scala-CLI ZIO module for querying Automat-CAM-KP with a simple query (see below for some examples) via the /query endpoint.
3. Create test files for the ZIO module which uses it to query an Automat-CAM-KP instance with some example data and compare the output to the expected output.
4. Initially this will focus on our primary customer, ICEES (see https://github.com/ExposuresProvider/cam-pipeline/issues/101 and https://github.com/ExposuresProvider/cam-kp-api/issues/599), but eventually we expect to enhance these tests as cam-pipeline itself improves.

An example of a simple query that works against Automat CAM-KP (i.e. by running curl -X POST "https://automat.renci.org/cam-kp/1.4/query" -H "accept: application/json" -H "Content-Type: application/json" -d "{\"message\":{\"query_graph\":{\"nodes\":{\"n0\":{\"categories\":[\"biolink:Gene\"],\"ids\":[\"NCBIGene:13870\"]},\"n1\":{\"categories\":[\"biolink:BiologicalProcess\"]}},\"edges\":{\"e01\":{\"subject\":\"n0\",\"object\":\"n1\",\"predicates\":[\"biolink:causes\"]}}}}}"):

{
    "message": {
        "query_graph": {
            "nodes": {
                "n0": {
                    "categories": ["biolink:Gene"],
                    "ids": ["NCBIGene:13870"]
                },
                "n1": {
                    "categories": ["biolink:BiologicalProcess"]
                }
            },
            "edges": {
                "e01": {
                    "subject": "n0",
                    "object": "n1",
                    "predicates": ["biolink:causes"]
                }
            }
        }
    }
}