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Linkerd2 Test Guide

This document covers how to run all of the tests that are present in the Linkerd2 repo. Most of these tests are run in CI, but you can use the instructions here to run the tests from source. For more information about working in this repo, see the BUILD.md guide.

Note that all shell commands in this guide are expected to be run from the root of this repo, unless otherwise indicated by a cd command.

Table of contents

Unit tests

Go

To run tests:

go test -cover -race ./...

To investigate code coverage:

cov=`mktemp`
go test -coverprofile=$cov ./...
go tool cover -html=$cov

Pretty-printed diffs for templated text

When running go test, mismatched text is usually displayed as a compact diff. If you prefer to see the full text of the mismatch with colorized output, you can set the LINKERD_TEST_PRETTY_DIFF environment variable or run go test ./cli/cmd/... --pretty-diff.

Updating templates

When kubernetes templates change, several test fixtures usually need to be updated (in cli/cmd/testdata/*.golden). These golden files can be automatically regenerated with the command:

go test ./cli/cmd/... --update

JavaScript

JavaScript dependencies are managed via yarn and webpack. We use jest as our test runner.

To fetch dependencies and run tests, run:

bin/web setup
bin/web test

# or alternatively:

cd web/app
yarn && NODE_ENV=test yarn webpack
yarn jest "$*"

For faster testing, run a subset of the tests by passing flags to jest.

Run tests on files that have changed since the last commit:

bin/web test -o

Run tests that match a spec name (regex):

bin/web test -t name-of-spec

Run watch mode:

bin/web test --watch # runs -o by default (tests only files changed since last commit)
bin/web test --watchAll # runs all tests after a change to a file

Shell

bin/shellcheck -x bin/*

Integration tests

The test/integration directory contains a test suite that can be run to validate Linkerd functionality via a series of end-to-end tests.

Prerequisites

Prerequisites for default behavior

The integration tests will configure their own k3s clusters by default (using the k3d helper). There are no prerequisites for this test path.

Prerequisites for existing cluster

If integration tests should run on an existing Kubernetes cluster, then the --skip-cluster-create flag should be passed. This will disable the tests from creating their own clusters and instead use the current Kubernetes context.

In this case, ensure the following:

  • The Linkerd docker images you're trying to test have been built and are accessible to the Kubernetes cluster to which you are deploying. If you're testing locally through a KinD or k3d cluster and don't want to push the images to a public registry, you can call bin/image-load --kind|k3d to load all the Linkerd images into those clusters.
  • The kubectl CLI has been configured to talk to that Kubernetes cluster

Running tests

You can use the bin/tests script to run one or all of the tests in the test suite.

The bin/tests script requires an absolute path to a linkerd binary to test.

Optional flags can be passed that change the testing behavior:

  • --name: Pass an argument with this flag to specify a specific test that should be run; all tests (except some special ones, see below) are run in the absence of this flag. Valid test names are included in the bin/tests --help output
  • --skip-cluster-create: Skip KinD cluster creation for each test and use an existing Kubernetes cluster
  • --images: (Primarily for CI) Loads images from the image-archive/ directory into the KinD clusters created for each test

View full help text:

bin/tests --help

Run individual test:

bin/tests --name upgrade /path/to/linkerd

Testing against the installed version of the CLI

You can run tests using your installed version of the linkerd CLI. For example, to run the full suite of tests using your installed CLI, run:

bin/tests `which linkerd`

If using an existing cluster to run tests, the resources can be cleaned up manually with:

bin/test-cleanup /path/to/linkerd

Testing against a locally-built version of the CLI

You can also test a locally-built version of the linkerd CLI.

First build all of the Linkerd images by running:

bin/docker-build

That command also copies the corresponding linkerd binaries into the target/cli directory, and you can use the bin/linkerd script to load those binaries when running tests. To run tests using your local binary, run:

bin/tests $PWD/bin/linkerd

Note: As stated above, if running tests in an existing KinD cluster by passing --skip-cluster-create, bin/kind-load must be run so that the images are available to the cluster

Special tests: cluster-domain, cni-calico-deep and multicluster

When running bin/tests without specifying --name all tests except for cluster-domain, cni-calico-deep and multicluster are run, because these require creating the clusters with special configurations. To run any of these tests, invoke them explicitly with --name for the script to create the cluster (using k3d) and trigger the test:

  • bin/tests --name cluster-domain: This simply creates the cluster with a cluster domain setting different than the default cluster.local, then installs Linkerd and triggers some smoke tests.
  • bin/tests --name cni-calico-deep: This installs a cluster replacing the default CNI plugin (which for k3s is Flannel) with the Calico CNI plugin, then installs the Linkerd CNI plugin and the Linkerd control plane, and finally triggers the full suite of deep tests.
  • bin/tests --name multicluster: Two k3d clusters are installed each one with separate instances of Linkerd sharing the same trust root. Then the multicluster component is installed, both clusters are linked together and a test ensures exported services can be reached between the two clusters.

Testing the dashboard

If you're new to the repo, make sure you've installed web dependencies via Yarn:

brew install yarn # if you don't already have yarn
bin/web setup

Then start up the dashboard at localhost:7777. You can do that in one of two ways:

# standalone
bin/web run

OR

# with webpack-dev-server
bin/web dev

Writing tests

To add a new test, create a new subdirectory inside the test/ directory. Configuration files, such as Kubernetes configs, should be placed inside a testdata/ directory inside the test subdirectory that you created. Then create a test file in the subdirectory that's suffixed with _test.go. This test file will be run automatically by the test runner script.

The tests rely heavily on the test helpers that are defined in the testutil/ directory. For a complete description of how to use the test helpers to write your own tests, view the testutil package's godoc, with:

godoc github.com/linkerd/linkerd2/testutil | less

Scale tests

The scale tests deploy a single Linkerd control-plane, and then scale up multiple sample apps across multiple replicas across multiple namespaces.

Prerequisites:

  • a linkerd CLI binary
  • Linkerd Docker images associated with the linkerd CLI binary
  • a Kubernetes cluster with sufficient resources to run 100s of pods

Run tests

bin/test-scale
usage: test-scale /path/to/linkerd [namespace]

For example, to test a newly built Linkerd CLI:

bin/test-scale `pwd`/bin/linkerd

Cleanup

bin/test-cleanup /path/to/linkerd

Test against multiple cloud providers

The bin/test-clouds script runs the integration tests against 4 cloud providers:

  • Amazon (EKS)
  • DigitalOcean (DO)
  • Google (GKE)
  • Microsoft (AKS)

This script assumes you have a working Kubernetes cluster set up on each Cloud provider, and that Kubernetes contexts are configured via environment variables.

For example:

export AKS=my-aks-cluster
export DO=do-nyc1-my-cluster
export EKS=arn:aws:eks:us-east-1:123456789012:cluster/my-cluster
export GKE=gke_my-project_us-east1-b_my-cluster

For more information on configuring access to multiple clusters, see: https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/#define-clusters-users-and-contexts

bin/test-clouds `pwd`/bin/linkerd

To cleanup all integration tests:

bin/test-clouds-cleanup