Log rejected promises

Forgoten in f9114a87f2

Comments by: @Stan
Differential Revision: https://code.wildfiregames.com/D5305
This was SVN commit r28155.

source/scriptinterface/ScriptContext.cpp

@@ -132,6 +132,7 @@ ScriptContext::ScriptContext(int contextSize, int heapGrowthBytesGCTrigger):
 	ScriptEngine::GetSingleton().RegisterContext(m_cx);
 
 	JS::SetJobQueue(m_cx, m_JobQueue.get());
+	JS::SetPromiseRejectionTrackerCallback(m_cx, &Script::UnhandledRejectedPromise);
 }
 
 ScriptContext::~ScriptContext()

source/scriptinterface/tests/test_Promises.h

@@ -42,6 +42,15 @@ public:
 		ScriptFunction::CallVoid(rq, global, "endTest");
 	}
 
+	void test_exception()
+	{
+		ScriptInterface script("Engine", "Test", g_ScriptContext);
+		TestLogger logger;
+		TS_ASSERT(script.LoadGlobalScriptFile(L"promises/reject.js"));
+		TS_ASSERT_STR_CONTAINS(logger.GetOutput(),
+			"An unhandled promise got rejected:\nError: message");
+	}
+
 	void setUp()
 	{
 		g_VFS = CreateVfs();