rmannibucau commented on a change in pull request #767:
URL: https://github.com/apache/tomee/pull/767#discussion_r590508449



##########
File path: 
container/openejb-core/src/main/java/org/apache/openejb/junit/jupiter/ApplicationComposerExtension.java
##########
@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
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+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * limitations under the License.
+ */
+package org.apache.openejb.junit.jupiter;
+
+import org.apache.openejb.OpenEJBRuntimeException;
+import org.apache.openejb.testing.ApplicationComposers;
+import org.junit.jupiter.api.extension.*;
+
+public class ApplicationComposerExtension implements BeforeEachCallback, 
AfterEachCallback {

Review comment:
       The split of an app composer app in multiple class is actually what you 
use ;). The constructor of ApplicationComposers takes N objects, just pass all 
test classes if you want a single deployment for all tests and enable each test 
to deploy part of the app.
   
   About the lifecycle it is not 1-1 with test instance lifecycle but the same 
idea for the container lifecycle (but you can have one test instance per test 
and one container instance for all tests of a single class when you want to 
reset another extension data/field instances for example). We can align on the 
default if nothing is set (so add to the enum an AUTO mode ;)) but must be 
configurable.
   
   About SingleApplicationComposerExtension i was thinking to 
https://github.com/apache/tomee/blob/master/tomee/tomee-embedded/src/main/java/org/apache/tomee/embedded/junit/TomEEEmbeddedSingleRunner.java
 or the same of meecrowave, when the app is fully modelized and you don't test 
a lib you only use that cause the perf boost is really impressive compared to 
starting one container per test.




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