Attempt to simplify jacoco logic

Signed-off-by: John Mazanec <jmazane@amazon.com>

build-tools/knnplugin-coverage.gradle

@@ -17,43 +17,35 @@
  *  break if there are multiple nodes in the integTestCluster. But for now... it sorta works.
  */
 
-import org.apache.tools.ant.taskdefs.condition.Os
 apply plugin: 'jacoco'
 
+jacoco {
+    toolVersion = "0.8.10"
+}
+
 // Get gradle to generate the required jvm agent arg for us using a dummy tasks of type Test. Unfortunately Elastic's
 // testing tasks don't derive from Test so the jacoco plugin can't do this automatically.
-def jacocoDir = "${buildDir}/jacoco"
-task dummyTest(type: Test) {
-    enabled = false
-    workingDir = file("/") // Force absolute path to jacoco agent jar
+def jacocoDir = "${project.layout.buildDirectory.get().asFile}/jacoco"
+test {
     jacoco {
         destinationFile = file("${jacocoDir}/test.exec")
         destinationFile.parentFile.mkdirs()
         jmx = true
     }
 }
 
-task dummyIntegTest(type: Test) {
-    enabled = false
-    workingDir = file("/") // Force absolute path to jacoco agent jar
+integTest {
     jacoco {
         destinationFile = file("${jacocoDir}/integTest.exec")
         destinationFile.parentFile.mkdirs()
         jmx = true
     }
-}
-
-integTest {
     systemProperty 'jacoco.dir', "${jacocoDir}"
     systemProperty 'jmx.serviceUrl', "service:jmx:rmi:///jndi/rmi://127.0.0.1:7777/jmxrmi"
 }
 
 jacocoTestReport {
     dependsOn integTest, test
-    executionData.from = [dummyTest.jacoco.destinationFile, dummyIntegTest.jacoco.destinationFile]
-    sourceDirectories.from = sourceSets.main.java.sourceDirectories
-    classDirectories.from = files(sourceSets.main.java.classesDirectory)
-
     reports {
         html.getRequired().set(true) // human readable
         csv.getRequired().set(true)
@@ -62,16 +54,8 @@ jacocoTestReport {
 }
 
 afterEvaluate {
-    jacocoTestReport.dependsOn integTest
-
+//    jacocoTestReport.dependsOn integTest
     testClusters.integTest {
-        if (Os.isFamily(Os.FAMILY_WINDOWS)) {
-            // Replacing build with absolute path to fix the error "error opening zip file or JAR manifest missing : /build/tmp/expandedArchives/..../jacocoagent.jar"
-            jvmArgs " ${dummyIntegTest.jacoco.getAsJvmArg()}".replace('build',"${buildDir}")
-        } else {
-            jvmArgs " ${dummyIntegTest.jacoco.getAsJvmArg()}".replace('javaagent:','javaagent:/')
-        }
-
         systemProperty 'com.sun.management.jmxremote', "true"
         systemProperty 'com.sun.management.jmxremote.authenticate', "false"
         systemProperty 'com.sun.management.jmxremote.port', "7777"

build.gradle

@@ -36,7 +36,6 @@ plugins {
     id 'java-library'
     id 'java-test-fixtures'
     id 'idea'
-    id 'jacoco'
     id "com.diffplug.spotless" version "6.3.0" apply false
     id 'io.freefair.lombok' version '8.4'
 }
@@ -135,10 +134,6 @@ if (!usingRemoteCluster) {
     }
 }
 
-jacoco {
-    toolVersion = "0.8.7"
-}
-
 check.dependsOn spotlessCheck
 check.dependsOn jacocoTestReport