Also exclude test coverage from instrumentation
MODIFY
dd-java-agent/instrumentation/java-concurrent/akka-testing/akka-testing.gradle
dd-java-agent/instrumentation/java-concurrent/akka-testing/akka-testing.gradle
apply from: "${rootDir}/gradle/java.gradle"
apply from: "${rootDir}/gradle/test-with-scala.gradle"
-excludedClassesConverage += ['*']
-
dependencies {
testCompile project(':dd-trace-api')
testCompile project(':dd-trace-ot')

MODIFY
gradle/java.gradle
gradle/java.gradle
@@ -4,7 +4,9 @@ apply plugin: 'groovy'
apply from: "$rootDir/gradle/checkstyle.gradle"
apply from: "$rootDir/gradle/codenarc.gradle"
-def applyCodeCoverage = !project.plugins.hasPlugin('com.github.johnrengelman.shadow')
+def applyCodeCoverage = !(project.plugins.hasPlugin('com.github.johnrengelman.shadow')
+ || project.path.startsWith(":dd-java-agent:instrumentation:"))
+
if (applyCodeCoverage) {
apply from: "$rootDir/gradle/jacoco.gradle"
}

Also exclude test coverage from instrumentation