235 lines
8.0 KiB
Markdown
235 lines
8.0 KiB
Markdown
### Run tests
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Contributing includes testing your changes. If you change the Moby code, you
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may need to add a new test or modify an existing test. Your contribution could
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even be adding tests to Moby. For this reason, you need to know a little
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about Moby's test infrastructure.
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This section describes tests you can run in the `dry-run-test` branch of your Docker
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fork. If you have followed along in this guide, you already have this branch.
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If you don't have this branch, you can create it or simply use another of your
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branches.
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## Understand how to test Moby
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Moby tests use the Go language's test framework. In this framework, files
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whose names end in `_test.go` contain test code; you'll find test files like
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this throughout the Moby repo. Use these files for inspiration when writing
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your own tests. For information on Go's test framework, see <a
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href="http://golang.org/pkg/testing/" target="_blank">Go's testing package
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documentation</a> and the <a href="http://golang.org/cmd/go/#hdr-Test_packages"
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target="_blank">go test help</a>.
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You are responsible for _unit testing_ your contribution when you add new or
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change existing Moby code. A unit test is a piece of code that invokes a
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single, small piece of code (_unit of work_) to verify the unit works as
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expected.
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Depending on your contribution, you may need to add _integration tests_. These
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are tests that combine two or more work units into one component. These work
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units each have unit tests and then, together, integration tests that test the
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interface between the components. The `integration` and `integration-cli`
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directories in the Docker repository contain integration test code.
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Testing is its own specialty. If you aren't familiar with testing techniques,
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there is a lot of information available to you on the Web. For now, you should
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understand that, the Docker maintainers may ask you to write a new test or
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change an existing one.
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## Run tests on your local host
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Before submitting a pull request with a code change, you should run the entire
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Moby Engine test suite. The `Makefile` contains a target for the entire test
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suite, named `test`. Also, it contains several targets for
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testing:
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| Target | What this target does |
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| ---------------------- | ---------------------------------------------- |
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| `test` | Run the unit, integration, and docker-py tests |
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| `test-unit` | Run just the unit tests |
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| `test-integration` | Run the integration tests |
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| `test-docker-py` | Run the tests for the Docker API client |
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Running the entire test suite on your current repository can take over half an
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hour. To run the test suite, do the following:
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1. Open a terminal on your local host.
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2. Change to the root of your Docker repository.
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```bash
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$ cd moby-fork
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```
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3. Make sure you are in your development branch.
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```bash
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$ git checkout dry-run-test
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```
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4. Run the `make test` command.
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```bash
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$ make test
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```
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This command does several things, it creates a container temporarily for
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testing. Inside that container, the `make`:
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* creates a new binary
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* cross-compiles all the binaries for the various operating systems
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* runs all the tests in the system
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It can take approximate one hour to run all the tests. The time depends
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on your host performance. The default timeout is 60 minutes, which is
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defined in `hack/make.sh` (`${TIMEOUT:=60m}`). You can modify the timeout
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value on the basis of your host performance. When they complete
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successfully, you see the output concludes with something like this:
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```none
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Ran 68 tests in 79.135s
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```
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## Run targets inside a development container
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If you are working inside a development container, you use the
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`hack/make.sh` script to run tests. The `hack/make.sh` script doesn't
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have a single target that runs all the tests. Instead, you provide a single
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command line with multiple targets that does the same thing.
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Try this now.
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1. Open a terminal and change to the `moby-fork` root.
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2. Start a Moby development image.
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If you are following along with this guide, you should have a
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`dry-run-test` image.
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```bash
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$ docker run --privileged --rm -ti -v `pwd`:/go/src/github.com/docker/docker dry-run-test /bin/bash
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```
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3. Run the tests using the `hack/make.sh` script.
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```bash
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root@5f8630b873fe:/go/src/github.com/docker/docker# hack/make.sh dynbinary binary cross test-unit test-integration test-docker-py
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```
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The tests run just as they did within your local host.
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Of course, you can also run a subset of these targets too. For example, to run
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just the unit tests:
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```bash
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root@5f8630b873fe:/go/src/github.com/docker/docker# hack/make.sh dynbinary binary cross test-unit
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```
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Most test targets require that you build these precursor targets first:
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`dynbinary binary cross`
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## Run unit tests
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We use golang standard [testing](https://golang.org/pkg/testing/)
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package or [gocheck](https://labix.org/gocheck) for our unit tests.
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You can use the `TESTDIRS` environment variable to run unit tests for
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a single package.
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```bash
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$ TESTDIRS='opts' make test-unit
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```
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You can also use the `TESTFLAGS` environment variable to run a single test. The
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flag's value is passed as arguments to the `go test` command. For example, from
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your local host you can run the `TestBuild` test with this command:
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```bash
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$ TESTFLAGS='-test.run ^TestValidateIPAddress$' make test-unit
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```
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On unit tests, it's better to use `TESTFLAGS` in combination with
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`TESTDIRS` to make it quicker to run a specific test.
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```bash
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$ TESTDIRS='opts' TESTFLAGS='-test.run ^TestValidateIPAddress$' make test-unit
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```
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## Run integration tests
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We use [gocheck](https://labix.org/gocheck) for our integration-cli tests.
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You can use the `TESTFLAGS` environment variable to run a single test. The
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flag's value is passed as arguments to the `go test` command. For example, from
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your local host you can run the `TestBuild` test with this command:
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```bash
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$ TESTFLAGS='-check.f DockerSuite.TestBuild*' make test-integration
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```
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To run the same test inside your Docker development container, you do this:
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```bash
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root@5f8630b873fe:/go/src/github.com/docker/docker# TESTFLAGS='-check.f TestBuild*' hack/make.sh binary test-integration
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```
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## Test the Windows binary against a Linux daemon
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This explains how to test the Windows binary on a Windows machine set up as a
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development environment. The tests will be run against a daemon
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running on a remote Linux machine. You'll use **Git Bash** that came with the
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Git for Windows installation. **Git Bash**, just as it sounds, allows you to
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run a Bash terminal on Windows.
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1. If you don't have one open already, start a Git Bash terminal.
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2. Change to the `moby` source directory.
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```bash
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$ cd /c/gopath/src/github.com/docker/docker
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```
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3. Set `DOCKER_REMOTE_DAEMON` as follows:
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```bash
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$ export DOCKER_REMOTE_DAEMON=1
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```
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4. Set `DOCKER_TEST_HOST` to the `tcp://IP_ADDRESS:2376` value; substitute your
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Linux machines actual IP address. For example:
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```bash
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$ export DOCKER_TEST_HOST=tcp://213.124.23.200:2376
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```
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5. Make the binary and run the tests:
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```bash
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$ hack/make.sh binary test-integration
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```
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Some tests are skipped on Windows for various reasons. You can see which
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tests were skipped by re-running the make and passing in the
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`TESTFLAGS='-test.v'` value. For example
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```bash
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$ TESTFLAGS='-test.v' hack/make.sh binary test-integration
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```
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Should you wish to run a single test such as one with the name
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'TestExample', you can pass in `TESTFLAGS='-check.f TestExample'`. For
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example
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```bash
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$ TESTFLAGS='-check.f TestExample' hack/make.sh binary test-integration
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```
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You can now choose to make changes to the Moby source or the tests. If you
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make any changes, just run these commands again.
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## Where to go next
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Congratulations, you have successfully completed the basics you need to
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understand the Moby test framework.
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