JavaScriptSupport delegate = newMock(JavaScriptSupport.class);
Environment env = mockEnvironment();
train_peekRequired(env, JavaScriptSupport.class, delegate);
expect(delegate.allocateClientId("fred")).andReturn("barney");
replay();
EnvironmentalShadowBuilder builder = new EnvironmentalShadowBuilderImpl(getService("PlasticProxyFactory",
PlasticProxyFactory.class), env);