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@title Arcanist User Guide: Code Coverage
@group userguide
Explains code coverage features in Arcanist and Phabricator.
This is a configuration guide that helps you set up advanced features. If you're
just getting started, you don't need to look at this yet. Instead, start with
the @{article:Arcanist User Guide}.
Before you can configure coverage features, you must set up unit test
integration. For instructions, see @{article:Arcanist User Guide: Configuring
a New Project} and @{article:Arcanist User Guide: Customizing
Lint, Unit Tests and Workflows}.
= Using Coverage Features =
If your project has unit tests with coverage integration (see below for
instructions on setting it up), you can use "arc" to show coverage reports.
For example:
arc unit --detailed-coverage src/some/file.php
Depending on how your test engine is configured, this will run tests relevant
to ##src/some/file.php## and give you a detailed coverage report.
If the test engine enables coverage by default, it will be uploaded to
Differential and displayed in the right gutter when viewing diffs.
= Enabling Coverage for libphutil, Arcanist and Phabricator =
If you're contributing, libphutil, Arcanist and Phabricator support coverage if
you install Xdebug:
http://xdebug.org/
It should be sufficient to correctly install Xdebug; coverage information will
be automatically enabled.
= Building Coverage Support =
To add coverage support to a unit test engine, just call ##setCoverage()## when
building @{class@arcanist:ArcanistUnitTestResult} objects. Provide a map of
file names (relative to the working copy root) to coverage report strings.
Coverage report strings look like this:
NNNNNCCCNNNNNNNNCCCCCCNNNUUUNNNNN
Each line in the file is represented by a character. Valid characters are:
- **N** Not executable. This is a comment or whitespace which should be
ignored when computing test coverage.
- **C** Covered. This line has test coverage.
- **U** Uncovered. This line is executable but has no test coverage.
- **X** Unreachable. If your coverage analysis can detect unreachable code,
you can report it here.
This format is intended to be as simple as possible. A valid coverage result
might look like this:
array(
'src/example.php' => 'NNCNNNCNUNNNUNUNUNUNUNC',
'src/other.php' => 'NNUNNNUNCNNNUNUNCNCNCNU',
);
You may also want to filter coverage information to the paths passed to the
unit test engine. See @{class@arcanist:ArcanistPhutilTestCase} and
@{class@arcanist:PhutilUnitTestEngine} for an example of coverage integration
in PHP using Xdebug.

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