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open-consul/test/integration/connect/envoy/README.md
Luke Kysow 8e4e0c23aa
Document integration tests (#14391)
2022-09-13 10:00:02 -07:00

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Envoy Integration Tests

Overview

These tests validate that Consul is configuring Envoy correctly. They set up various scenarios using Docker containers and then run Bats (a Bash test framework) tests to validate the expected results.

Running Tests

To run the tests locally, cd into the root of the repo and run:

make test-envoy-integ

To run a specific test, run:

make test-envoy-integ GO_TEST_FLAGS="-run TestEnvoy/case-basic"

Where case-basic can be replaced by any directory name from this directory.

How Do These Tests Work

  1. The tests are all run through Go test via the main_test.go file. Each directory prefixed by case- is a subtest, for example, TestEnvoy/case-basic and TestEnvoy/case-wanfed-gw.
  2. The real framework for this test suite lives in run-tests.sh. Under the hood, main_test.go just runs run-tests.sh with various arguments.
  3. The tests use your local code by building a Docker image from your local directory just before executing.
  4. The tests run Docker containers connected by a shared Docker network. All tests have at least one Consul server running and then depending on the test case they will spin up additional services or gateways. Some tests run multiple Consul servers to test multi-DC setups.
  5. At a high level, tests are set up by executing the setup.sh script in each directory. This script uses helper functions defined in helpers.bash. Once the test case is set up, the validations in verify.bats are run.
  6. In CI, the tests are executed against different Envoy versions and with both XDS_TARGET=client and XDS_TARGET=server. If set to client, a Consul server and client are run, and services are registered against the client. If set to server, only a Consul server is run, and services are registered against the server. By default, XDS_TARGET is set to server. See this comment for more information.

Investigating Test Failures

  • When tests fail in CI, logs and additional debugging data are available in the artifacts of the test run.
  • You can re-run the tests locally by running make test-envoy-integ GO_TEST_FLAGS="-run TestEnvoy/<case-directory>" where <case-directory> is replaced with the name of the directory, e.g. case-basic.
  • Locally, all the logs of the failed test will be available in workdir in this directory.
  • You can run with DEBUG=1 to print out all the commands being run, e.g. DEBUG=1 make test-envoy-integ GO_TEST_FLAGS="-run TestEnvoy/case-basic".
  • If you want to prevent the Docker containers from being spun down after test failure, add a sleep 9999 to the verify.bats test case that's failing.