Automatically add default filter subscription when necessary.

test/JsEngine.cpp

Index: test/JsEngine.cpp
===================================================================
--- a/test/JsEngine.cpp
+++ b/test/JsEngine.cpp
@@ -20,19 +20,21 @@
 
 namespace
 {
   class JsEngineTest : public BaseJsTest
   {
   };
 
   bool callbackCalled = false;
-  void Callback()
+  AdblockPlus::JsValueList callbackParams;
+  void Callback(AdblockPlus::JsValueList& params)
   {
     callbackCalled = true;
+    callbackParams = params;
   }
 }
 
 TEST_F(JsEngineTest, Evaluate)
 {
   jsEngine->Evaluate("function hello() { return 'Hello'; }");
   AdblockPlus::JsValuePtr result = jsEngine->Evaluate("hello()");
   ASSERT_TRUE(result->IsString());
@@ -75,18 +77,22 @@ TEST_F(JsEngineTest, EventCallbacks)
   // Trigger event without a callback
   callbackCalled = false;
   jsEngine->Evaluate("_triggerEvent('foobar')");
   ASSERT_FALSE(callbackCalled);
 
   // Set callback
   jsEngine->SetEventCallback("foobar", Callback);
   callbackCalled = false;
-  jsEngine->Evaluate("_triggerEvent('foobar')");
+  jsEngine->Evaluate("_triggerEvent('foobar', 1, 'x', true)");
   ASSERT_TRUE(callbackCalled);
+  ASSERT_EQ(callbackParams.size(), 3u);
+  ASSERT_EQ(callbackParams[0]->AsInt(), 1);
+  ASSERT_EQ(callbackParams[1]->AsString(), "x");
+  ASSERT_TRUE(callbackParams[2]->AsBool());
 
   // Trigger a different event
   callbackCalled = false;
   jsEngine->Evaluate("_triggerEvent('barfoo')");
   ASSERT_FALSE(callbackCalled);
 
   // Remove callback
   jsEngine->RemoveEventCallback("foobar");