From 6729c8341f15d046b87c0ac7f4f15e1c49c11440 Mon Sep 17 00:00:00 2001
From: Alec Thomas <alec@swapoff.org>
Date: Tue, 15 Sep 2015 11:19:36 +1000
Subject: Test that receivers are only called once for each emit.

See #109.
---
 entityx/Event_test.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/entityx/Event_test.cc b/entityx/Event_test.cc
index c643ee9..c315051 100644
--- a/entityx/Event_test.cc
+++ b/entityx/Event_test.cc
@@ -35,12 +35,15 @@ struct Collision {
 struct ExplosionSystem : public Receiver<ExplosionSystem> {
   void receive(const Explosion &explosion) {
     damage_received += explosion.damage;
+    received_count++;
   }
 
   void receive(const Collision &collision) {
     damage_received += collision.damage;
+    received_count++;
   }
 
+  int received_count = 0;
   int damage_received = 0;
 };
 
@@ -51,9 +54,11 @@ TEST_CASE("TestEmitReceive") {
   em.subscribe<Collision>(explosion_system);
   REQUIRE(0 == explosion_system.damage_received);
   em.emit<Explosion>(10);
+  REQUIRE(1 == explosion_system.received_count);
   REQUIRE(10 == explosion_system.damage_received);
   em.emit<Collision>(10);
   REQUIRE(20 == explosion_system.damage_received);
+  REQUIRE(2 == explosion_system.received_count);
 }
 
 TEST_CASE("TestUntypedEmitReceive") {
@@ -63,6 +68,7 @@ TEST_CASE("TestUntypedEmitReceive") {
   REQUIRE(0 == explosion_system.damage_received);
   Explosion explosion(10);
   em.emit(explosion);
+  REQUIRE(1 == explosion_system.received_count);
   REQUIRE(10 == explosion_system.damage_received);
 }
 
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