I've committed a prototype of using the Microcontainer from testcases.
You trivially extend the base test and use a suite() to bootstrap the test's
microcontainer xml config.

The xml config must be in the classpath and have a similar name to the testcase.
e.g.

org.jboss.test.junit.test.JUnitTestCase.java

/*
 * JBoss, Home of Professional Open Source
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 */
package org.jboss.test.junit.test;

import junit.framework.Test;

import org.jboss.test.kernel.junit.MicrocontainerTest;

/**
 * A JUnitTestCase.
 *
 * @author <a href="adrian@jboss.com">Adrian Brock</a>
 * @version $Revision: 1.1 $
 */
public class JUnitTestCase extends MicrocontainerTest
{
 /**
 * Bootstrap the test
 *
 * @return the test
 */
 public static Test suite()
 {
 return suite(JUnitTestCase.class);
 }

 /**
 * Create a new JUnitTestCase.
 *
 * @param name the test name
 */
 public JUnitTestCase(String name)
 {
 super(name);
 }

 public void testOne() throws Exception
 {
 System.out.println(getBean("TheBean"));
 }

 public void testTwo() throws Exception
 {
 System.out.println(getBean("TheBean"));
 }
}

<?xml version="1.0" encoding="UTF-8"?>

<deployment xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="urn:jboss:bean-deployer bean-deployer_1_0.xsd"
 xmlns="urn:jboss:bean-deployer">
 <bean name="TheBean" class="javax.naming.InitialContext"/>
</deployment>

0 DEBUG [JUnitTestCase] ==== setUp org.jboss.test.junit.test.JUnitTestCase ====
25 DEBUG [KernelFactory] Starting JBoss Kernel construction...
510 DEBUG [KernelFactory] Completed JBoss Kernel construction. Duration: 485 milliseconds
1585 WARN [XsdBinder] NOT HANDLED WILDCARD IN GLOBAL MODEL GROUP
1976 DEBUG [JUnitTestCase] Deploying file:/home/adrian/jboss-head/workspace/kernel/src/resources/org/jboss/test/junit/test/JUnitTestCase.xml
2111 DEBUG [JUnitTestCase] Deployed file:/home/adrian/jboss-head/workspace/kernel/src/resources/org/jboss/test/junit/test/JUnitTestCase.xml
2114 DEBUG [JUnitTestCase] ==== Starting testOne ====
javax.naming.InitialContext@f07355
2115 DEBUG [JUnitTestCase] ==== Stopping testOne ====
2115 DEBUG [JUnitTestCase] ==== Starting testTwo ====
javax.naming.InitialContext@f07355
2116 DEBUG [JUnitTestCase] ==== Stopping testTwo ====
2116 DEBUG [JUnitTestCase] ==== tearDown org.jboss.test.junit.test.JUnitTestCase ====
2116 DEBUG [JUnitTestCase] Undeploying file:/home/adrian/jboss-head/workspace/kernel/src/resources/org/jboss/test/junit/test/JUnitTestCase.xml
2117 DEBUG [JUnitTestCase] Undeployed file:/home/adrian/jboss-head/workspace/kernel/src/resources/org/jboss/test/junit/test/JUnitTestCase.xml