Add coverage

.github/workflows/ci.yml

@@ -62,4 +62,10 @@ jobs:
         run: sbt ++${{ matrix.scala }} githubWorkflowCheck
 
       - name: Build project
-        run: sbt ++${{ matrix.scala }} test
+        run: sbt ++${{ matrix.scala }} clean coverage test
+
+      - name: Upload coverage data to Coveralls
+        env:
+          COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COVERALLS_FLAG_NAME: Scala ${{ matrix.scala }}
+        run: sbt ++${{ matrix.scala }} coverageReport coverageAggregate coveralls

README.md

@@ -1,5 +1,6 @@
 [![Build Status](https://github.com/aiven/guardian-for-apache-kafka/actions/workflows/ci.yml/badge.svg)](https://github.com/aiven/guardian-for-apache-kafka/actions)
 [![Apache License](https://img.shields.io/badge/license-APACHE_2-green.svg)](https://www.apache.org/licenses/LICENSE-2.0)
+[![Coverage](https://coveralls.io/repos/github/aiven/guardian-for-apache-kafka/badge.svg?branch=main)](https://coveralls.io/github/aiven/guardian-for-apache-kafka?branch=main)
 
 # Guardian for Apache Kafka®
 

build.sbt

@@ -289,6 +289,22 @@ ThisBuild / githubWorkflowEnv ++= Map(
 
 ThisBuild / githubWorkflowJavaVersions := List(JavaSpec.temurin("11"))
 
+ThisBuild / githubWorkflowBuild := Seq(
+  WorkflowStep.Sbt(List("clean", "coverage", "test"), name = Some("Build project"))
+)
+
+ThisBuild / githubWorkflowBuildPostamble ++= Seq(
+  // See https://github.com/scoverage/sbt-coveralls#github-actions-integration
+  WorkflowStep.Sbt(
+    List("coverageReport", "coverageAggregate", "coveralls"),
+    name = Some("Upload coverage data to Coveralls"),
+    env = Map(
+      "COVERALLS_REPO_TOKEN" -> "${{ secrets.GITHUB_TOKEN }}",
+      "COVERALLS_FLAG_NAME"  -> "Scala ${{ matrix.scala }}"
+    )
+  )
+)
+
 import ReleaseTransformations._
 
 releaseCrossBuild := true

project/plugins.sbt

@@ -5,3 +5,5 @@ addSbtPlugin("com.codecommit"        % "sbt-github-actions"  % "0.14.2")
 addSbtPlugin("com.github.sbt"        % "sbt-pgp"             % "2.1.2")
 addSbtPlugin("com.github.sbt"        % "sbt-release"         % "1.1.0")
 addSbtPlugin("ch.epfl.scala"         % "sbt-scalafix"        % "0.9.34")
+addSbtPlugin("org.scoverage"         % "sbt-scoverage"       % "1.9.3")
+addSbtPlugin("org.scoverage"         % "sbt-coveralls"       % "1.3.1")