Add comment that constructor is used by tests

Author: laurit

javaagent-bootstrap/src/main/java/io/opentelemetry/javaagent/bootstrap/AgentClassLoader.java

@@ -69,8 +69,9 @@ public class AgentClassLoader extends URLClassLoader {
   private final boolean isSecurityManagerSupportEnabled;
   private final Manifest manifest;
 
-  public AgentClassLoader(File javaagentFile, String internalJarFileName) {
-    this(javaagentFile, internalJarFileName, false);
+  // Used by tests
+  public AgentClassLoader(File javaagentFile) {
+    this(javaagentFile, "", false);
   }
 
   /**

javaagent-bootstrap/src/test/groovy/io/opentelemetry/javaagent/bootstrap/AgentClassLoaderTest.groovy

@@ -19,7 +19,7 @@ class AgentClassLoaderTest extends Specification {
     def className2 = 'some/class/Name2'
     // any jar would do, use opentelemety sdk
     URL testJarLocation = JavaVersionSpecific.getProtectionDomain().getCodeSource().getLocation()
-    AgentClassLoader loader = new AgentClassLoader(new File(testJarLocation.toURI()), "")
+    AgentClassLoader loader = new AgentClassLoader(new File(testJarLocation.toURI()))
     Phaser threadHoldLockPhase = new Phaser(2)
     Phaser acquireLockFromMainThreadPhase = new Phaser(2)
 
@@ -58,7 +58,7 @@ class AgentClassLoaderTest extends Specification {
     boolean jdk8 = "1.8" == System.getProperty("java.specification.version")
     // sdk is a multi release jar
     URL multiReleaseJar = JavaVersionSpecific.getProtectionDomain().getCodeSource().getLocation()
-    AgentClassLoader loader = new AgentClassLoader(new File(multiReleaseJar.toURI()), "") {
+    AgentClassLoader loader = new AgentClassLoader(new File(multiReleaseJar.toURI())) {
       @Override
       protected String getClassSuffix() {
         return ""

javaagent-tooling/javaagent-tooling-java9/src/test/groovy/UnsafeTest.groovy

@@ -14,7 +14,7 @@ class UnsafeTest extends Specification {
     setup:
     ByteBuddyAgent.install()
     URL testJarLocation = AgentClassLoader.getProtectionDomain().getCodeSource().getLocation()
-    AgentClassLoader loader = new AgentClassLoader(new File(testJarLocation.toURI()), "")
+    AgentClassLoader loader = new AgentClassLoader(new File(testJarLocation.toURI()))
     UnsafeInitializer.initialize(ByteBuddyAgent.getInstrumentation(), loader, false)
 
     expect: