Adding a couple plugin proxy tests (courtesy of Denis Arh)

tests/PluginProxyTests.php

+<?php
+
+require_once DWOO_DIRECTORY . 'Dwoo/Compiler.php';
+
+class PluginProxyTests extends PHPUnit_Framework_TestCase
+{
+    protected $compiler;
+    protected $dwoo;
+
+    public function setUp()
+    {
+        $this->compiler = new Dwoo_Compiler();
+        $this->dwoo = new Dwoo(DWOO_COMPILE_DIR, DWOO_CACHE_DIR);
+    }
+
+    public function tearDown()
+    {
+        unset($this->compiler, $this->dwoo);
+    }
+
+    public function testPlainNestedProxyCall()
+    {
+        $this->dwoo->setPluginProxy(new PluginProxyTest_PluginProxy);
+
+        // test simple assign
+        $tpl = new Dwoo_Template_String('{F1_Stub(F2_Stub())}');
+        $tpl->forceCompilation();
+
+        $this->assertContains(
+            'PluginProxyTest_F1_Stub(PluginProxyTest_F2_Stub',
+            $this->compiler->compile($this->dwoo, $tpl)
+        );
+    }
+
+    public function testAdvNestedProxyCall()
+    {
+        $this->dwoo->setPluginProxy(new PluginProxyTest_PluginProxy);
+
+
+        // test simple assign
+        $tpl = new Dwoo_Template_String('{assign F1_Stub(F2_Stub(\'/public/css/global.css\'))->something(F3_Stub(\'/public/css/global.css\')) styles}');
+        $tpl->forceCompilation();
+
+        $this->assertContains(
+            'PluginProxyTest_F3_Stub(',
+            $this->compiler->compile($this->dwoo, $tpl)
+        );
+    }
+}
+
+class PluginProxyTest_PluginProxy implements Dwoo_IPluginProxy {
+    public function handles($name) {
+        return 'F' == substr($name, 0, 1);
+    }
+
+    public function getCode($name, $params) {
+        return 'PluginProxyTest_'. $name .'('.Dwoo_Compiler::implode_r($params).')';
+    }
+
+    public function getCallback($name) {
+        return 'PluginProxyTest_' . $name;
+    }
+
+    public function getLoader($name) {
+        return '';
+    }
+}
+
+function PluginProxyTest_F1_Stub() {
+    return new PluginProxyTest_C1_Stub;
+}
+
+function PluginProxyTest_F2_Stub($in = '') {
+    return $in . '#1';
+}
+
+function PluginProxyTest_F3_Stub($in = '') {
+    return $in . '#1';
+}
+
+class PluginProxyTest_C1_Stub {
+    function something($in) {
+        return $in . '#2';
+    }
+}