sbt-scoverage

sbt-scoverage is an sbt plugin that offers support for Scala code coverage using scoverage. This plugin supports Scala 2.12, 2.13, and 3.

NOTE: that ScalaJS and Scala Native support is limited to Scala 2. NOTE: that Scala 3 support starts with 3.2.x.

Setup

Requirements: Requires sbt 1.2.8 or above

In project/plugins.sbt:

addSbtPlugin("org.scoverage" % "sbt-scoverage" % "x.x.x")

If you are in an enterprise environment, and the above does not work, try:

libraryDependencies += "org.scoverage" % "sbt-scoverage_2.12_1.0" % "x.x.x"

Usage

Run the tests with enabled coverage:

sbt clean coverage test

or if you have integration tests as well

sbt clean coverage it:test

To enable coverage directly in your build, use:

coverageEnabled := true

To generate the coverage reports run

sbt coverageReport

Coverage reports will be in your target/scala-<scala-version>/scoverage-report directory. There are HTML and XML reports. The XML is useful if you need to programatically use the results, or if you're writing a tool.

NOTE: If you're running the coverage reports from within an sbt console session (as opposed to one command per sbt launch), then the coverage command is sticky. To turn it back off when you're done running reports, use the coverageOff command or reset coverageEnabled with set coverageEnabled := false.

Multi project reports

By default, scoverage will generate reports for each project separately. You can merge them into an aggregated report by using the following:

$ sbt coverageAggregate

NOTE: You do not need to run coverageReport before coverageAggregate; it aggregates over the sub-projects' coverage data directly, not the report xml.

Exclude classes and packages and files

You can exclude classes from being considered for coverage measurement by providing semicolon-separated list of regular expressions.

coverageExcludedPackages := "<empty>;Reverse.*;.*AuthService.*;models\\.data\\..*"

The regular expressions are matched against the fully qualified class name, and must match the entire string to take effect. Any matched classes will not be instrumented or included in the coverage report.

You can also exclude files and file paths.

coverageExcludedFiles := ".*\\/two\\/GoodCoverage;.*\\/three\\/.*"

Note: The .scala file extension needs to be omitted from the filename, if one is given.

Note: These two options only work for Scala2. Right now Scala3 does not support a way to exclude packages or files from being instrumented.

You can also mark sections of code with comments like:

  // $COVERAGE-OFF$Disabling highlighting by default until a workaround for https://issues.scala-lang.org/browse/SI-8596 is found
  ...
  // $COVERAGE-ON$

Any code between two such comments will not be instrumented or included in the coverage report.

Minimum coverage

Based on minimum coverage, you can fail the build with the following keys:

coverageFailOnMinimum := true
coverageMinimumStmtTotal := 90
coverageMinimumBranchTotal := 90
coverageMinimumStmtPerPackage := 90
coverageMinimumBranchPerPackage := 85
coverageMinimumStmtPerFile := 85
coverageMinimumBranchPerFile := 80

These settings will be enforced when the reports are generated. If you generate an aggregate report using coverageAggregate then these settings will apply to that report.

Override Location for Coverage Data And Report

If desired, one could override the default location for generating the sbt report and data through setting coverageDataDir:

Example in data-dir test:

coverageDataDir := target.value / "custom-test"

Can also be set through the sbt set directive

set coverageDataDir := file("/tmp")

Trouble-shooting failing tests

scoverage does a lot of file writing behind the scenes in order to track which statements have been executed. If you are running into a scenario where your tests normally pass, but fail when scoverage is enabled, then the culprit can be one of the following:

• timing issues on futures and other async operations, try upping the timeouts by an order of magnitude.
• tests are run in a sandbox mode (such as with java.security.PrivilegedAction<T>), try running the tests outside of the sandbox.

Example project

the scoverage samples project.

Integrations

Codacy

Codacy integrates with your favorite coverage tool to provide an in-depth overlook of your project status. scoverage information can be integrated into Codacy through the codacy-coverage-reporter.

Coveralls

If you have an open source project then you can add code coverage metrics with the Coveralls. scoverage will integrate with coveralls using the sbt-coveralls plugin.

Codecov

You can integrate with Codecov easily sending your reports there via your CI. You can see an example of this here in codecov/example-scala.

Plugin for SonarQube

If you want to visually browse statement coverage reports then use this plugin for SonarQube. It allows you to review overall project statement coverage as well as dig deeper into sub-modules, directories and source code files to see uncovered statements. Statement coverage measurement can become an integral part of your team's continuous integration process and a required quality standard.

Release Notes

For any information on releases and upgrading, please refer to the release page.