Add missing method

src/main/groovy/com/lesfurets/jenkins/unit/declarative/DeclarativePipelineTest.groovy

@@ -9,6 +9,7 @@ abstract class DeclarativePipelineTest extends BasePipelineTest {
 
     def pipelineInterceptor = { Closure closure ->
         GenericPipelineDeclaration.binding = delegate.binding
+        GenericPipelineDeclaration.pipelineOwner = closure.owner
         GenericPipelineDeclaration.createComponent(DeclarativePipeline, closure).execute(delegate)
     }
 

src/main/groovy/com/lesfurets/jenkins/unit/declarative/GenericPipelineDeclaration.groovy

@@ -12,6 +12,7 @@ abstract class GenericPipelineDeclaration {
     PostDeclaration post
     Map<String, StageDeclaration> stages = [:]
     static def binding = null
+    static def pipelineOwner = null
 
     static <T> T createComponent(Class<T> componentType,
                                  @DelegatesTo(strategy = DELEGATE_ONLY) Closure<T> closure) {
@@ -33,6 +34,22 @@ abstract class GenericPipelineDeclaration {
                 return retVal
             }
         }
+        componentInstance.metaClass.methodMissing = { String methodName, args ->
+            def retVal
+            def metaMethod = componentInstance.metaClass.getMetaMethod(methodName, args)
+            if (metaMethod) {
+                retVal = componentInstance.invokeMethod(methodName, args)
+            } else {
+                metaMethod = pipelineOwner.metaClass.getMetaMethod(methodName, args)
+                if(metaMethod){
+                    retVal = pipelineOwner.invokeMethod(methodName, args)
+                } else {
+                    throw new MissingMethodException(methodName, componentInstance.class, args)
+                }
+            }
+            return retVal
+        }
+
         rehydrate.call()
         return componentInstance
     }

src/test/jenkins/jenkinsfiles/Agent_bindings_Jenkinsfile

@@ -1,6 +1,4 @@
-
 def AGENT = 'someLabel'
-
 pipeline {
     agent none
     stages {
@@ -18,6 +16,12 @@ pipeline {
                 sh 'java -version'
             }
         }
+        stage('Example Release') {
+            agent agentName()
+            steps {
+                echo "Deploy to ${AGENT}"
+            }
+        }
         stage('Example Deploy') {
             agent AGENT
             steps {
@@ -26,3 +30,6 @@ pipeline {
         }
     }
 }
+private String agentName(){
+    return 'someLabel';
+}