Integrating scala code coverage tool jacoco into a play 2.2.x project - scala

Question

My goal is to integrate jacoco into my play 2.2.0 project.
Different guides on the web I tried to follow mostly added to confusion not to closing in on the goal.
Adding to confusion
Most guides assume the existance of an build.sbt
which as it seems as been superseded by an build.scala with a different
There is a jacoco4sbt and a regular jacoco
which one is most appropiate for use with scala play framework 2
Current state
in plugins.sbt added
addSbtPlugin("de.johoop" % "jacoco4sbt" % "2.1.2")
in build.scala added
import de.johoop.jacoco4sbt.JacocoPlugin._
lazy val jacoco_settings = Defaults.defaultSettings ++ Seq(jacoco.settings: _*)
With these changes i don't get an "jacoco" task in sbt nor in the play console.
What are the appropriate steps to get this working?
Update
As requested the content of the build.scala
import com.typesafe.sbt.SbtNativePackager._
import com.typesafe.sbt.SbtScalariform._
import play.Project._
import sbt.Keys._
import sbt._
import sbtbuildinfo.Plugin._
import de.johoop.jacoco4sbt.JacocoPlugin._
object BuildSettings {
val buildOrganization = "XXXXX"
val buildVersion = "0.1"
val buildScalaVersion = "2.10.2"
val envConfig = "-Dsbt.log.format=false -Dconfig.file=" + Option(System.getProperty("env.config")).getOrElse("local.application")
scalacOptions ++= Seq("-encoding", "UTF-8", "-deprecation", "-unchecked", "-feature")
javaOptions += envConfig
val buildSettings = Defaults.defaultSettings ++ Seq (
organization := buildOrganization,
version := buildVersion,
scalaVersion := buildScalaVersion
)
}
object Resolvers {
val remoteRepoUrl = "XXXXXXXXXXXX" at "http://nexus.cXXXXX/content/repositories/snapshots/"
val publishRepoUrl = "XXXXXXXXXXXX" at "http://nexus.ciXXXXXXXXXXXXXXXX/content/repositories/snapshots/"
}
object Dependencies {
val ods = "XXXXXXXXX" % "XXXXXX-ws" % "2.2.1-SNAPSHOT"
val scalatest = "org.scalatest" %% "scalatest" % "2.0.M8" % "test"
val mockito = "org.mockito" % "mockito-all" % "1.9.5" % "test"
}
object ApplicationBuild extends Build {
import BuildSettings._
import Dependencies._
import Resolvers._
// Sub-project specific dependencies
val commonDeps = Seq(
ods,
scalatest,
mockito
)
//val bN = settingKey[Int]("current build Number")
val gitHeadCommitSha = settingKey[String]("current git commit SHA")
val release = settingKey[Boolean]("Release")
lazy val jacoco_settings = Defaults.defaultSettings ++ Seq(jacoco.settings: _*)
lazy val nemo = play.Project(
"nemo",
path = file("."),
settings = Defaults.defaultSettings ++ buildSettings ++
Seq(libraryDependencies ++= commonDeps) ++
Seq(scalariformSettings: _*) ++
Seq(playScalaSettings: _*) ++
buildInfoSettings ++
jacoco_settings ++
Seq(
sourceGenerators in Compile <+= buildInfo,
buildInfoKeys ++= Seq[BuildInfoKey](
resolvers,
libraryDependencies in Test,
buildInfoBuildNumber,
BuildInfoKey.map(name) { case (k, v) => "project" + k.capitalize -> v.capitalize },
"envConfig" -> envConfig, // computed at project load time
BuildInfoKey.action("buildTime") {
System.currentTimeMillis
} // re-computed each time at compile
),
buildInfoPackage := "com.springer.nemo"
) ++
Seq(resolvers += remoteRepoUrl) ++
Seq(mappings in Universal ++= Seq(
file("ops/rpm/start-server.sh") -> "start-server.sh",
file("ops/rpm/stop-server.sh") -> "stop-server.sh"
))
).settings(version <<= version in ThisBuild)
lazy val nemoPackaging = Project(
"nemoPackaging",
file("nemoPackaging"),
settings = Defaults.defaultSettings ++Seq(Packaging.settings:_*)
)
def publishSettings =
Seq(
publishTo := Option(publishRepoUrl),
credentials += Credentials(
"Repo", "http://mycompany.com/repo", "admin", "admin123"))
}
Note: jacoco is running with this but does not pick up our tests. Output:
jacoco:cover
[info] Compiling 1 Scala source to /home/schl14/work/nemo/target/scala-2.10/classes...
[info] ScalaTest
[info] Run completed in 13 milliseconds.
[info] Total number of tests run: 0
[info] Suites: completed 0, aborted 0
[info] Tests: succeeded 0, failed 0, canceled 0, ignored 0, pending 0
[info] All tests passed.
[info] Passed: Total 0, Failed 0, Errors 0, Passed 0
[info] No tests to run for nemo/jacoco:test

Answer 1

I solved it by doing this.
Add the following to plugins.sbt
addSbtPlugin("de.johoop" % "jacoco4sbt" % "2.1.2")
In build.scala i added a new import
import de.johoop.jacoco4sbt.JacocoPlugin._
and added jacoco to the config section like this
lazy val xyz = play.Project(
"xyz",
path = file("."),
settings = Defaults.defaultSettings
jacoco.settings ++ //this is the important part.
).settings(parallelExecution in jacoco.Config := false) //not mandatory but needed in `most cases as most test can not be run in parallel`
After these steps jacoco:cover was available in the sbt and play console and also discovers our tests.

Answer 2

A better option for Scala code coverage is Scoverage which gives statement line coverage.
https://github.com/scoverage/scalac-scoverage-plugin
Add to project/plugins.sbt:
addSbtPlugin("com.sksamuel.scoverage" % "sbt-scoverage" % "1.0.1")
Then run SBT with
sbt clean coverage test

Answer 3

To measure the code coverage of Java code jacoco4sbt is the best fit.
Add to project/plugins.sbt:
addSbtPlugin("de.johoop" % "jacoco4sbt" % "2.1.2")
Add at the end of build.sbt:
jacoco.settings
Then run in the terminal:
//or just the sbt command and then use your browser
sbt jacoco:cover && /usr/bin/x-www-browser target/scala-2.10/jacoco/html/index.html
Scala code coverage can also be determined by SCCT.
Add to project/plugins.sbt:
addSbtPlugin("com.github.scct" % "sbt-scct" % "0.2.1")
Add at the end of build.sbt:
ScctPlugin.instrumentSettings
And then to see the coverage:
sbt scct:test && /usr/bin/x-www-browser target/scala_2.10/coverage-report/index.html
Maybe you get the error
Please either restart the browser with --allow-file-access-from-files
or use a different browser.
Maybe you use chrome and the security settings forbid dynamic actions on local files. You can open the page with firefox or use python -m SimpleHTTPServer 8000 to bind it to the http protokoll and open http://localhost:8000/target/scala-2.10/coverage-report/ .
Inspiration which generated classes should be excluded from the report can you find on the mailing list.
My test projects are on GitHub.