Setup Kover as test coverage tool

.github/workflows/pull_request.yml

@@ -120,6 +120,20 @@ jobs:
         with:
           arguments: check
 
+      - name: Create code coverage report
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: koverMergedReport
+
+      - name: Add coverage report to PR
+        id: kover
+        uses: mi-kas/kover-report@v1
+        with:
+          path: build/reports/kover/merged/xml/report.xml
+          token: ${{ secrets.GITHUB_TOKEN }}
+          title: Kover Report
+          update-comment: true
+
       - name: Upload reports
         if: failure()
         uses: actions/upload-artifact@v3

arrow-libs/gradle/test-coverage.gradle

@@ -30,3 +30,5 @@
 //    dependsOn test // tests are required to run before generating the report
 //    mustRunAfter test
 //}
+
+apply plugin: 'kover'

build.gradle.kts

@@ -23,6 +23,7 @@ plugins {
   alias(libs.plugins.dokka)
   alias(libs.plugins.animalSniffer) apply false
   alias(libs.plugins.kotest.multiplatform) apply false
+  alias(libs.plugins.kotlinx.kover)
   alias(libs.plugins.kotlin.multiplatform) apply false
   alias(libs.plugins.kotlin.binaryCompatibilityValidator)
   alias(libs.plugins.arrowGradleConfig.nexus)
@@ -44,6 +45,24 @@ configure<kotlinx.knit.KnitPluginExtension> {
   }
 }
 
+koverMerged {
+  enable()
+  filters {
+    projects {
+      excludes.addAll(
+        listOf(
+          ":arrow-annotations",
+          ":arrow-core-test",
+          ":arrow-fx-coroutines-test",
+          ":arrow-optics-test",
+          ":arrow-site",
+          ":arrow-stack"
+        )
+      )
+    }
+  }
+}
+
 allprojects {
   group = property("projects.group").toString()
 }

gradle/libs.versions.toml

@@ -10,6 +10,7 @@ jUnitJupiter = "5.8.2"
 jUnitVintage = "5.8.2"
 kotest = "5.5.4"
 kotestGradle = "5.5.4"
+kover = "0.6.0"
 kotlin = "1.7.22"
 kotlinBinaryCompatibilityValidator = "0.12.1"
 kotlinCompileTesting = "1.4.9"
@@ -63,5 +64,6 @@ kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 kotlin-multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
 kotlin-binaryCompatibilityValidator = { id = "org.jetbrains.kotlinx.binary-compatibility-validator", version.ref = "kotlinBinaryCompatibilityValidator" }
 kotlinx-knit = { id = "org.jetbrains.kotlinx.knit", version.ref = "knit" }
+kotlinx-kover = { id = "org.jetbrains.kotlinx.kover", version.ref = "kover" }
 kotlinx-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
 ksp = { id = "com.google.devtools.ksp", version.ref = "kspVersion" }