From a2243b6501ff09a3b1fbcaae36a687baf4be78b8 Mon Sep 17 00:00:00 2001
From: Andrew Noyes <anoyes34@gmail.com>
Date: Thu, 26 Sep 2019 12:39:57 -0700
Subject: [PATCH] Add test for delay ordering

See #2148
---
 fdbrpc/FlowTests.actor.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/fdbrpc/FlowTests.actor.cpp b/fdbrpc/FlowTests.actor.cpp
index 87645975ae..7317c81ff0 100644
--- a/fdbrpc/FlowTests.actor.cpp
+++ b/fdbrpc/FlowTests.actor.cpp
@@ -50,6 +50,26 @@ TEST_CASE("/flow/actorcompiler/lineNumbers") {
 	return Void();
 }
 
+TEST_CASE("/flow/delayOrdering") {
+	state double x = deterministicRandom()->random01();
+	state double y = deterministicRandom()->random01();
+	if (BUGGIFY) {
+		y = x;
+	}
+	state int last = 0;
+	state Future<Void> f1 = map(delay(x), [last = &last](const Void&) {
+		*last = 1;
+		return Void();
+	});
+	state Future<Void> f2 = map(delay(y), [last = &last](const Void&) {
+		*last = 2;
+		return Void();
+	});
+	wait(f1 && f2);
+	ASSERT((x <= y) == (last == 2));
+	return Void();
+}
+
 template <class T, class Func, class ErrFunc, class CallbackType>
 class LambdaCallback : public CallbackType, public FastAllocated<LambdaCallback<T,Func,ErrFunc,CallbackType>> {
 	Func func;