Modernize/simplify JUnit Gradle configuration

ibm-mq-metrics/build.gradle.kts

@@ -9,20 +9,6 @@ description = "IBM-MQ metrics"
 otelJava.moduleName.set("io.opentelemetry.contrib.ibm-mq-metrics")
 application.mainClass.set("io.opentelemetry.ibm.mq.opentelemetry.Main")
 
-sourceSets {
-  create("integrationTest") {
-    compileClasspath += sourceSets.main.get().output
-    runtimeClasspath += sourceSets.main.get().output
-  }
-}
-
-val integrationTestImplementation by configurations.getting {
-  extendsFrom(configurations.implementation.get())
-}
-val integrationTestRuntimeOnly by configurations.getting
-
-configurations["integrationTestRuntimeOnly"].extendsFrom(configurations.runtimeOnly.get())
-
 val ibmClientJar: Configuration by configurations.creating {
   isCanBeResolved = true
   isCanBeConsumed = false
@@ -42,13 +28,6 @@ dependencies {
   implementation("org.slf4j:slf4j-simple:2.0.17")
   testImplementation("com.google.guava:guava")
   testImplementation("io.opentelemetry:opentelemetry-sdk-testing")
-  integrationTestImplementation("org.assertj:assertj-core:3.27.6")
-  integrationTestImplementation("org.junit.jupiter:junit-jupiter-api:5.13.4")
-  integrationTestImplementation("io.opentelemetry:opentelemetry-sdk-testing")
-  integrationTestImplementation("com.ibm.mq:com.ibm.mq.jakarta.client:9.4.3.1")
-  integrationTestImplementation("jakarta.jms:jakarta.jms-api:3.1.0")
-  integrationTestImplementation("org.junit.jupiter:junit-jupiter-engine:5.13.4")
-  integrationTestRuntimeOnly("org.junit.platform:junit-platform-launcher:1.13.4")
   ibmClientJar("com.ibm.mq:com.ibm.mq.allclient:9.4.3.1") {
     artifact {
       name = "com.ibm.mq.allclient"
@@ -58,23 +37,29 @@ dependencies {
   }
 }
 
-tasks.shadowJar {
-  dependencies {
-    exclude(dependency("com.ibm.mq:com.ibm.mq.allclient:9.4.3.1"))
+testing {
+  suites {
+    val integrationTest by registering(JvmTestSuite::class) {
+      dependencies {
+        implementation("org.assertj:assertj-core:3.27.6")
+        implementation("io.opentelemetry:opentelemetry-sdk-testing")
+        implementation("com.ibm.mq:com.ibm.mq.jakarta.client:9.4.3.1")
+        implementation("jakarta.jms:jakarta.jms-api:3.1.0")
+      }
+
+      targets {
+        all {
+          testTask.configure {
+            shouldRunAfter(tasks.test)
+          }
+        }
+      }
+    }
   }
 }
 
-val integrationTest = tasks.register<Test>("integrationTest") {
-  description = "Runs integration tests."
-  group = "verification"
-
-  testClassesDirs = sourceSets["integrationTest"].output.classesDirs
-  classpath = sourceSets["integrationTest"].runtimeClasspath
-  shouldRunAfter("test")
-
-  useJUnitPlatform()
-
-  testLogging {
-    events("passed")
+tasks.shadowJar {
+  dependencies {
+    exclude(dependency("com.ibm.mq:com.ibm.mq.allclient:9.4.3.1"))
   }
 }