Add test case for log4j agent

Author: paullegranddc

dd-smoke-tests/lib-injection/src/test/groovy/datadog/smoketest/MultipleAgentGuardrailsTest.groovy

@@ -1,12 +1,25 @@
 package datadog.smoketest
 
+import java.nio.file.Files
+import java.nio.file.StandardCopyOption
+
+
 abstract class MultipleAgentGuardrailsTest extends AbstractSmokeTest {
   static final String LIB_INJECTION_ENABLED_FLAG = 'DD_INJECTION_ENABLED'
   static final String LIB_INJECTION_FORCE_FLAG = 'DD_INJECT_FORCE'
 
   @Override
   ProcessBuilder createProcessBuilder() {
+    String extraAgentFilename() {
+      return null
+    }
+
     def jarPath = System.getProperty("datadog.smoketest.shadowJar.path")
+    if (extraAgentFilename() != null) {
+      renamedJar = Paths.get(jarPath).getParent().resolve(extraAgentFilename())
+      Files.copy(Paths.get(jarPath), renamedJar, StandardCopyOption.REPLACE_EXISTING)
+      jarPath = renamedJar.toString()
+    }
     def command = []
     command+= javaPath()
     command.addAll(defaultJavaProperties)
@@ -78,3 +91,26 @@ class LibInjectionForcedTest extends MultipleAgentGuardrailsTest {
     return true
   }
 }
+
+// Test that injection still works if we have to agent if one of them is the aws emr log4j patcher 
+class LibsInjectionWorksEmr extends MultipleAgentGuardrailsTest {
+  @Override
+  boolean isLibInjectionEnabled() {
+    return true
+  }
+
+  @Override
+  boolean isLibInjectionForced() {
+    return false
+  }
+
+  @Override
+  String extraAgentFilenam() {
+    return "Log4jHotPatchFat.jar"
+  }
+
+  @Override
+  boolean isExpectingTrace() {
+    return true
+  }
+}