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Testing Linux-Based Engines

Testing Linux-Based Engines

Unit Testing

Unit testing your Microengine is a simple process:

  1. build a Docker image of your Microengine
  2. run docker-compose to use tox to execute your testing logic in tests/scan_test.py

Run the following commands from the root of your project directory.

Build your Microengine into a Docker image:

$ docker build -t ${PWD##*/} -f docker/Dockerfile .

This will produce a Docker image tagged with the name of the directory, e.g. microengine-myeicarengine.

Run the tests:

$ docker-compose -f docker/test-unit.yml up

If your Microengine is capable of detecting EICAR and not producing a false positive on the string “not a malicious file”, then you should pass these basic unittests and see something like this:

$ docker-compose -f docker/test-unit.yml up
Recreating docker_test_engine_mylinuxengine_1_a9d540dc7394 ... done
Attaching to docker_test_engine_mylinuxengine_1_a9d540dc7394
test_engine_mylinuxengine_1_a9d540dc7394 | py35 run-test-pre: PYTHONHASHSEED='1705267802'
test_engine_mylinuxengine_1_a9d540dc7394 | py35 runtests: commands[0] | pytest -s
test_engine_mylinuxengine_1_a9d540dc7394 | ============================= test session starts ==============================
test_engine_mylinuxengine_1_a9d540dc7394 | platform linux -- Python 3.5.6, pytest-3.9.2, py-1.7.0, pluggy-0.8.0
test_engine_mylinuxengine_1_a9d540dc7394 | hypothesis profile 'default' -> database=DirectoryBasedExampleDatabase('/usr/src/app/.hypothesis/examples')
test_engine_mylinuxengine_1_a9d540dc7394 | rootdir: /usr/src/app, inifile:
test_engine_mylinuxengine_1_a9d540dc7394 | plugins: timeout-1.3.2, cov-2.6.0, asyncio-0.9.0, hypothesis-3.82.1
test_engine_mylinuxengine_1_a9d540dc7394 | collected 36 items
test_engine_mylinuxengine_1_a9d540dc7394 |
test_engine_mylinuxengine_1_a9d540dc7394 | tests/scan_test.py .
test_engine_mylinuxengine_1_a9d540dc7394 | tests/test_bloom.py ......
test_engine_mylinuxengine_1_a9d540dc7394 | tests/test_bounties.py .
test_engine_mylinuxengine_1_a9d540dc7394 | tests/test_client.py ............
test_engine_mylinuxengine_1_a9d540dc7394 | tests/test_corpus.py ..
test_engine_mylinuxengine_1_a9d540dc7394 | tests/test_events.py ..............
test_engine_mylinuxengine_1_a9d540dc7394 |
test_engine_mylinuxengine_1_a9d540dc7394 | ========================== 36 passed in 39.42 seconds ==========================
test_engine_mylinuxengine_1_a9d540dc7394 | ___________________________________ summary ____________________________________
test_engine_mylinuxengine_1_a9d540dc7394 |   py35: commands succeeded
test_engine_mylinuxengine_1_a9d540dc7394 |   congratulations :)

Of course, this testing is quite limited - you’ll want to expand on your tests in scan_test.py, as appropriate for your Microengine.

Integration Testing

The PolySwarm marketplace is composed of a myriad of participants and technologies: Ethereum & IPFS nodes, contracts, Microengines, Ambassadors, Arbiters, artifacts and much more. Testing a single component often demands availability of all of the other components.

The orchestration project makes standing up a complete testnet easy and seamless. True to its name, orchestration orchestrates all the components necessary to stand up and tear down an entire PolySwarm marketplace environment on a local development machine.

Clone orchestration adjacent to your microengine-myeicarengine directory:

$ git clone https://github.com/polyswarm/orchestration

(Optional) Preview a Complete, Working Testnet

Let’s spin up a complete, working testnet to get a sense for what things should look like.

In the cloned orchestration directory:

$ docker-compose -f base.yml -f tutorial0.yml up

You’ll see output from the following services:

  1. homechain: A geth node running our testnet’s “homechain”. See Chains: Home vs Side for an explanation of our split-chain design.
  2. sidechain: Another geth instance, this one running our testnet’s “sidechain”.
  3. ipfs: An IPFS node responsible for hosting all artifacts in our development testnet.
  4. polyswarmd: The PolySwarm daemon providing convenient access to the services offered by homechain, sidechain and ipfs.
  5. contracts: Responsible for housing & deploying the PolySwarm Nectar (NCT) and BountyRegistry contracts onto our development testnet.
  6. ambassador: A mock Ambassador (provided by polyswarm-client) that will place bounties on the EICAR file and on a file that is not EICAR.
  7. arbiter: A mock Arbiter (provided by polyswarm-client) that will deliver Verdicts on “swarmed” artifacts, determining ground truth.
  8. microengine: A mock Microengine (provided by polyswarm-client) that will investigate the “swarmed” artifacts and render Assertions.

Browse through the logs scroll on the screen to get a sense for what each of these components is doing. Let it run for at least 5 minutes - it can take time to deploy contracts - and then the fun starts :)

When you’ve seen enough log output, do Ctrl-C to halt the development testnet gracefully.

Test Your Engine

Prior to testing, always check for updates to core PolySwarm Docker images. In the cloned orchestration project:

$  docker-compose -f base.yml -f tutorial0.yml pull

Let’s spin up a subset of the testnet, leaving out the stock microengine (we’ll be replacing this with our own) and the ambassador services.

In the cloned orchestration project:

$ docker-compose -f base.yml -f tutorial0.yml up --scale microengine=0 --scale ambassador=0

It will take several minutes for polyswarmd to become available. Once polyswarmd is available, it will begin serving responses to clients, e.g.:

INFO:polyswarmd:2018-12-06 05:42:08.396534 GET 200 /nonce 0x05328f171b8c1463eaFDACCA478D9EE6a1d923F8
INFO:geventwebsocket.handler:::ffff: - - [2018-12-06 05:42:08] "GET /nonce?account=0x05328f171b8c1463eaFDACCA478D9EE6a1d923F8&chain=home HTTP/1.1" 200 135 0.048543

Next, let’s spin up our Microengine in a second terminal window in our microengine’s directory:

$ docker-compose -f docker/test-integration.yml up

Finally, let’s introduce some artifacts for our Microengine to scan in a third terminal window in the orchestration directory:

$ docker-compose -f base.yml -f tutorial0.yml up --no-deps ambassador

Take a look at the logs from all three terminal windows - you should see your Microengine responding to the Ambassador’s Bounties!

When you make changes to your Engine, testing those changes is as simple as re-building your Docker image and re-running the ambassador service to inject a new a new pair of EICAR/not-EICAR artifacts. You can keep the rest of the testnet running while you iterate.