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consul/test-integ/README.md

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test-integ

Go integration tests for consul. /test/integration also holds integration tests; they need migrating.

These should use the testing/deployer framework to bring up some local testing infrastructure and fixtures to run test assertions against.

Where reasonably possible, try to bring up infrastructure interesting enough to be able to run many related sorts of test against it, rather than waiting for many similar clusters to be provisioned and torn down. This will help ensure that the integration tests do not consume CPU cycles needlessly.

Prerequisites

Before you can run these tests, a fresh dev build should be created and tagged for automatic use by tests using utils.TargetImages(). This can be done by the toplevel consul make target:

make test-deployer-setup

You can run the entire set of deployer integration tests using:

make test-deployer         # everything except peering_commontopo
make test-deployer-peering # just peering_commontopo

You can also run them one by one if you like:

go test ./catalogv2 -run TestBasicL4ExplicitDestinations -v

You can have the logs stream unbuffered directly to your terminal which can help diagnose stuck tests that would otherwise need to fully timeout before the logs would print by also setting the NOLOGBUFFER=1 environment variable.

Getting started

Deployer tests have three main parts:

  1. Declarative topology description.
  2. Launching the infrastructure defined by that description.
  3. Making test assertions about the infrastructure.

Some tests may also have an optional mutation phase followed by additional assertions. These are only needed if the test needs to observe a reaction in the system to a change in the environment or configuration.

Topology description

Test authors craft a declarative description of the infrastructure necessary to exist for the test. These are also referred to as a "topology".

These are comprised of 4 main parts:

  • Images: The set of docker images and specific versions that will be used by default if not overridden on each Cluster or Node.

    • Consul CE
    • Consul Enterprise
    • Consul Dataplane
    • Envoy Proxy

  • Networks: The non-overlapping networks that should exist for use by the Clusters.

  • Clusters: The unique Consul clusters that should exist.

    • Nodes: A "box with ip address(es)". This should feel a bit like a VM or a Kubernetes Pod as an enclosing entity.

      • Workloads: The list of service instances (v1) or workloads (v2) that will execute on the given node. v2 Services will be implied by similarly named workloads here unless opted out. This helps define a v1-compatible topology and repurpose it for v2 without reworking it.

    • Services (v2): v2 Service definitions to define explicitly, in addition to the inferred ones.

    • InitialConfigEntries (v1): Config entries that should be created as part of the fixture and that make sense to include as part of the test definition, rather than something created during the test assertion phase.

    • InitialResources (v2): v2 Resources that should be created as part of the fixture and that make sense to include as part of the test definition, rather than something created during the test assertion phase.

  • Peerings: The peering relationships between Clusters to establish.

In the topoutil package there are some helpers for defining common sets of nodes or workloads like Consul Servers, Mesh Gateways, or fortio servers

Useful topology concepts

Consul has a lot of independent configurables that can greatly increase the testing configuration space required to flush out any bugs. The topology definition was designed to be easily "exploded" to create testing microcosms on a variety of axes:

  • agentful (clients) vs agentless (dataplane)
  • tenancies (partitions, namespaces)
  • locally or across a peering
  • catalog v1 or v2 object model

Since the topology is just a declarative struct, a test author could rewrite any one of these attributes with a single field (such as Node.Kind or Node.Version) and cause the identical test to run against the other configuration. With the addition of a few if enterprise {} blocks and for loops, a test author could easily write one test of a behavior and execute it to cover agentless, agentful, non-default tenancy, and v1/v2 in a few extra lines of code.

Non-optional security settings

The test framework always enables ACLs in default deny mode and provisions minimal-permission tokens automatically to the various containers that need them.

TLS certificates are similarly minted and distributed to all components that need them.

Launching a topology

There is a sprawltest package that has utilities to bring up a topology in the context of a Go test. This is basically a one-liner:

sp := sprawltest.Launch(t, config)

After this line returns you will have a handle (sp) to the running cluster and can use it to get ready-made api clients, http clients, gRPC resource client, or test sockets open to a variety of the topology components for use in authoring test code.

This helper will rig up a t.Cleanup handler that will destroy all resources created during the test. This can be opted-out of by setting the SPRAWL_KEEP_RUNNING=1 environment variable before running the tests.

Upgrade test

We are migrating upgrade tests from consul-container(/test/integration) to this directory using the testing/deployer framework.

The current implementation supports two upgrade strategies: standard upgrade and autopilot upgrade. The basic test scenario can be found in ./test-integ/upgrade/basic.

Test assertions

Typical service mesh tests want to ensure that use of a service from another service behaves in a certain way. Because the entire set of components is known declaratively, we can process it into a flat list of known source/destination relationships:

ships := topology.ComputeRelationships()

This works hand-in-hand with the topology concepts mentioned above to programmatically verify independent subunits of a topology that may exist (this is helpful for things like testing multiple tenancy configurations without duplicating all of the assertion code).

This can also be pretty printed to the log for diagnostic purposes with:

t.Log(topology.RenderRelationships(ships))

Which looks like this:

$ NOLOGBUFFER=1 go test ./catalogv2/ -run TestBasicL4ExplicitDestinations -v
...(skipping a bunch of output)...
2023-11-08T11:48:04.395-0600 [INFO]  TestBasicL4ExplicitDestinations: topology is ready for use: elapsed=33.510298357s
    explicit_destinations_test.go:55: DOWN   |node               |service                         |port   |UP    |service                         |
        dc1    |default/dc1-box2   |default/default/single-client   |5000   |dc1   |default/default/single-server   |
        dc1    |default/dc1-box4   |default/default/multi-client    |5000   |dc1   |default/default/multi-server    |
        dc1    |default/dc1-box4   |default/default/multi-client    |5001   |dc1   |default/default/multi-server    |
               |                   |                                |       |      |                                |

=== RUN   TestBasicL4ExplicitDestinations/relationship:_default/default/single-client_on_default/dc1-box2_in_dc1_via_:5000_=>_default/default/single-server_in_dc1_port_http
    service.go:224: making call to http://10.238.170.5:5000
    service.go:245: ...got response code 200
=== RUN   TestBasicL4ExplicitDestinations/relationship:_default/default/multi-client_on_default/dc1-box4_in_dc1_via_:5000_=>_default/default/multi-server_in_dc1_port_http
    service.go:224: making call to http://10.238.170.7:5000
    service.go:245: ...got response code 200
=== RUN   TestBasicL4ExplicitDestinations/relationship:_default/default/multi-client_on_default/dc1-box4_in_dc1_via_:5001_=>_default/default/multi-server_in_dc1_port_http-alt
    service.go:224: making call to http://10.238.170.7:5001
    service.go:245: ...got response code 200
2023-11-08T11:48:04.420-0600 [INFO]  TestBasicL4ExplicitDestinations.tfgen: Running 'terraform destroy'...
--- PASS: TestBasicL4ExplicitDestinations (40.60s)
    --- PASS: TestBasicL4ExplicitDestinations/relationship:_default/default/single-client_on_default/dc1-box2_in_dc1_via_:5000_=>_default/default/single-server_in_dc1_port_http (0.01s)
    --- PASS: TestBasicL4ExplicitDestinations/relationship:_default/default/multi-client_on_default/dc1-box4_in_dc1_via_:5000_=>_default/default/multi-server_in_dc1_port_http (0.01s)
    --- PASS: TestBasicL4ExplicitDestinations/relationship:_default/default/multi-client_on_default/dc1-box4_in_dc1_via_:5001_=>_default/default/multi-server_in_dc1_port_http-alt (0.01s)
PASS
ok  	github.com/hashicorp/consul/test-integ/catalogv2	40.612s

There is a ready-made helper to assist with making common inquiries to Consul and Envoy that you can create in your test:

asserter := topoutil.NewAsserter(sp)

asserter.UpstreamEndpointStatus(t, svc, clusterPrefix+".", "HEALTHY", 1)

Examples