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Add testing.md

Signed-off-by: Daniel Nephin <dnephin@docker.com>

Daniel Nephin authored on 2017/08/05 06:25:51
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CONTRIBUTING.md
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@@ -155,10 +155,7 @@ Fork the repository and make changes on your fork in a feature branch:
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 	your intentions, and name it XXXX-something where XXXX is the number of the
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 	issue.
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-Submit unit tests for your changes. Go has a great test framework built in; use
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-it! Take a look at existing tests for inspiration. [Run the full test
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-suite](https://docs.docker.com/opensource/project/test-and-docs/) on your branch before
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-submitting a pull request.
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+Submit tests for your changes. See [TESTING.md](./TESTING.md) for details.
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 Update the documentation when creating or modifying features. Test your
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 documentation changes for clarity, concision, and correctness, as well as a
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 high majority of submissions should have a single commit, so if in doubt: squash
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 down to one.
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-After every commit, [make sure the test suite passes]
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-(https://docs.docker.com/opensource/project/test-and-docs/). Include documentation
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-changes in the same pull request so that a revert would remove all traces of
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-the feature or fix.
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+After every commit, [make sure the test suite passes](./TESTING.md). Include
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+documentation changes in the same pull request so that a revert would remove
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+all traces of the feature or fix.
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 Include an issue reference like `Closes #XXXX` or `Fixes #XXXX` in commits that
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 close an issue. Including references automatically closes the issue on a merge.
TESTING.md
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+# Testing
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+
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+This document contains the Moby code testing guidelines. It should answer any
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+questions you may have as an aspiring Moby contributor.
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+
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+## Test suites
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+
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+Moby has two test suites (and one legacy test suite):
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+
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+* Unit tests - use standard `go test` and
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+  [testify](https://github.com/stretchr/testify) assertions. They are located in
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+  the package they test. Unit tests should be fast and test only their own
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+  package.
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+* API integration tests - use standard `go test` and
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+  [testify](https://github.com/stretchr/testify) assertions. They are located in
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+  `./integration/<component>` directories, where `component` is: container,
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+  image, volume, etc. These tests perform HTTP requests to an API endpoint and
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+  check the HTTP response and daemon state after the call.
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+
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+The legacy test suite `integration-cli/` is deprecated. No new tests will be
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+added to this suite. Any tests in this suite which require updates should be
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+ported to either the unit test suite or the new API integration test suite.
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+
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+## Writing new tests
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+
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+Most code changes will fall into one of the following categories.
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+
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+### Writing tests for new features
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+
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+New code should be covered by unit tests. If the code is difficult to test with
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+a unit tests then that is a good sign that it should be refactored to make it
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+easier to reuse and maintain. Consider accepting unexported interfaces instead
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+of structs so that fakes can be provided for dependencies.
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+
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+If the new feature includes a completely new API endpoint then a new API
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+integration test should be added to cover the success case of that endpoint.
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+
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+If the new feature does not include a completely new API endpoint consider
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+adding the new API fields to the existing test for that endpoint. A new
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+integration test should **not** be added for every new API field or API error
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+case. Error cases should be handled by unit tests.
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+
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+### Writing tests for bug fixes
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+
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+Bugs fixes should include a unit test case which exercises the bug.
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+
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+A bug fix may also include new assertions in an existing integration tests for the
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+API endpoint.
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+
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+## Running tests
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+
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+To run the unit test suite:
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+
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+```
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+make test-unit
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+```
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+
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+or `hack/test/unit` from inside a `BINDDIR=. make shell` container or properly
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+configured environment.
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+
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+The following environment variables may be used to run a subset of tests:
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+
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+* `TESTDIRS` - paths to directories to be tested, defaults to `./...`
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+* `TESTFLAGS` - flags passed to `go test`, to run tests which match a pattern
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+  use `TESTFLAGS="-test.run TestNameOrPrefix"`
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+
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+To run the integration test suite:
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+
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+```
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+make test-integration
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+```