diff --git a/autotest/CoAlgo/CoAlgo.cpp b/autotest/CoAlgo/CoAlgo.cpp
index 81c501c59..42e1f4b01 100644
--- a/autotest/CoAlgo/CoAlgo.cpp
+++ b/autotest/CoAlgo/CoAlgo.cpp
@@ -9,7 +9,7 @@ CONSOLE_APP_MAIN
 	SeedRandom(0);
 	
 	Vector<int> h;
-	for(int i = 0; i < 10000; i++)
+	for(int i = 0; i < 100000; i++)
 		h << Random(5000);
 	
 	ASSERT(CoSum(h) == Sum(h));
@@ -20,5 +20,8 @@ CONSOLE_APP_MAIN
 	for(int i = 0; i < h.GetCount(); i++)
 		ASSERT(FindIndex(h, h[i]) == FindIndex(h, h[i]));
 	
+	ASSERT(Count(h, 200) == CoCount(h, 200));
+	ASSERT(CountIf(h, [](auto x) { return x % 17 == 0; }) == CoCountIf(h, [](auto x) { return x % 17 == 0; }));
+	
 	LOG("============ OK");
 }