Update Render component to accept multiple items, closures, and default to rendering it to a component writer.

web-view-components/src/main/groovy/groowt/view/component/web/lib/Render.groovy

@@ -1,26 +1,34 @@
 package groowt.view.component.web.lib
 
 import groowt.view.View
+import groowt.view.component.runtime.DefaultComponentWriter
 
 class Render extends DelegatingWebViewComponent {
 
-    private final Object item
+    private final Object items
 
     Render(Map attr) {
-        item = Objects.requireNonNull(attr.item, "<Render> attribute 'item' must not be null.")
+        if (attr.item && attr.items) {
+            throw new IllegalArgumentException("<Render> cannot have both 'item' and 'items' attributes.")
+        }
+        this.items = attr.item ? [attr.item] : attr.items ?: []
     }
 
     @Override
     protected View getDelegate() {
         return { Writer w ->
-            if (item.respondsTo('renderTo', [Writer] as Class[])) {
-                item.renderTo(w)
-            } else if (item.respondsTo('render')) {
-                w << item.render()
+            items.each {
+                if (it instanceof Closure) {
+                    it = it()
+                }
+                if (it.respondsTo('renderTo', [Writer] as Class[])) {
+                    it.renderTo(w)
+                } else if (it.respondsTo('render')) {
+                    w << it.render()
                 } else {
-                throw new IllegalArgumentException(
-                        '<Render> must use an item which responds to either renderTo(Writer) or render().'
-                )
+                    def cw = new DefaultComponentWriter(w, context.renderContext, context)
+                    cw << it
+                }
             }
         }
     }

web-view-components/src/test/groovy/groowt/view/component/web/lib/OutletTests.groovy

@@ -1,6 +1,5 @@
 package groowt.view.component.web.lib
 
-
 import groowt.view.component.web.WebViewComponentContext
 import groowt.view.component.web.WebViewComponentScope
 import org.junit.jupiter.api.Test

web-view-components/src/test/groovy/groowt/view/component/web/lib/RenderTests.groovy

@@ -1,5 +1,7 @@
 package groowt.view.component.web.lib
 
+
+import groowt.view.component.web.BaseWebViewComponent
 import org.junit.jupiter.api.Test
 
 class RenderTests extends AbstractWebViewComponentTests {
@@ -20,6 +22,14 @@ class RenderTests extends AbstractWebViewComponentTests {
 
     }
 
+    static final class Hello extends BaseWebViewComponent {
+
+        Hello() {
+            super('Hello, World!')
+        }
+
+    }
+
     @Test
     void renderToExample() {
         doTest('''
@@ -44,4 +54,18 @@ class RenderTests extends AbstractWebViewComponentTests {
         )
     }
 
+    @Test
+    void rendersComponent() {
+        doTest('<Render item={<RenderTests.Hello />} />', 'Hello, World!', context {
+            configureRootScope {
+                addWithNoArgConstructor(Hello)
+            }
+        })
+    }
+
+    @Test
+    void rendersItems() {
+        doTest('<Render items={[0, 1, 2]} />', '012')
+    }
+
 }