From 1b4571533a9049553eaeb59e0819a8ad5c048616 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?R=C3=A9my=20Coutable?= Date: Tue, 8 Aug 2017 10:47:05 +0200 Subject: Document rspec-retry and rspec-flaky MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Rémy Coutable --- doc/development/testing.md | 32 ++++++++++++++++++++++---------- 1 file changed, 22 insertions(+), 10 deletions(-) diff --git a/doc/development/testing.md b/doc/development/testing.md index 3d5aa3d45e9..b54eaf29b18 100644 --- a/doc/development/testing.md +++ b/doc/development/testing.md @@ -157,8 +157,9 @@ trade-off: - Unit tests are usually cheap, and you should consider them like the basement of your house: you need them to be confident that your code is behaving - correctly. However if you run only unit tests without integration / system tests, you might [miss] the [big] [picture]! -- Integration tests are a bit more expensive, but don't abuse them. A feature test + correctly. However if you run only unit tests without integration / system + tests, you might [miss] the [big] [picture]! +- Integration tests are a bit more expensive, but don't abuse them. A system test is often better than an integration test that is stubbing a lot of internals. - System tests are expensive (compared to unit tests), even more if they require a JavaScript driver. Make sure to follow the guidelines in the [Speed](#test-speed) @@ -188,24 +189,35 @@ Please consult the [dedicated "Frontend testing" guide](./fe_guide/testing.md). ### General Guidelines - Use a single, top-level `describe ClassName` block. -- Use `described_class` instead of repeating the class name being described - (_this is enforced by RuboCop_). - Use `.method` to describe class methods and `#method` to describe instance methods. - Use `context` to test branching logic. - Use multi-line `do...end` blocks for `before` and `after`, even when it would fit on a single line. -- Don't assert against the absolute value of a sequence-generated attribute (see [Gotchas](gotchas.md#dont-assert-against-the-absolute-value-of-a-sequence-generated-attribute)). -- Don't supply the `:each` argument to hooks since it's the default. -- Prefer `not_to` to `to_not` (_this is enforced by RuboCop_). -- Try to match the ordering of tests to the ordering within the class. -- Try to follow the [Four-Phase Test][four-phase-test] pattern, using newlines +- Follow the [Four-Phase Test][four-phase-test] pattern, using newlines to separate phases. -- Try to use `Gitlab.config.gitlab.host` rather than hard coding `'localhost'` +- Use `Gitlab.config.gitlab.host` rather than hard coding `'localhost'` +- Try to match the ordering of tests to the ordering within the class. +- Don't assert against the absolute value of a sequence-generated attribute (see + [Gotchas](gotchas.md#dont-assert-against-the-absolute-value-of-a-sequence-generated-attribute)). +- Don't supply the `:each` argument to hooks since it's the default. - On `before` and `after` hooks, prefer it scoped to `:context` over `:all` [four-phase-test]: https://robots.thoughtbot.com/four-phase-test +### Automatic retries and flaky tests detection + +On our CI, we use [rspec-retry] to automatically retry a failing example a few +times (see [`spec/spec_helper.rb`] for the precise retries count). + +We also use a home-made `RspecFlaky::Listener` listener which records flaky +examples in a JSON report file on `master` (`retrieve-tests-metadata` and `update-tests-metadata` jobs), and warns when a new flaky example +is detected in any other branch (`flaky-examples-check` job). In the future, the +`flaky-examples-check` job will not be allowed to fail. + +[rspec-retry]: https://github.com/NoRedInk/rspec-retry +[`spec/spec_helper.rb`]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/spec/spec_helper.rb + ### `let` variables GitLab's RSpec suite has made extensive use of `let` variables to reduce -- cgit v1.2.1