From 4725eb12469c741384999137f43c49769b86a565 Mon Sep 17 00:00:00 2001
From: Suyash Kumar <suyashk@google.com>
Date: Mon, 8 Jul 2024 23:52:37 -0400
Subject: [PATCH] Fix Combine test with empty list.

The spec says:

"If either argument is null, or the source list is empty, the result is null."

https://cql.hl7.org/09-b-cqlreference.html#combine
---
 tests/cql/CqlStringOperatorsTest.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/cql/CqlStringOperatorsTest.xml b/tests/cql/CqlStringOperatorsTest.xml
index c260946..6b06a0b 100644
--- a/tests/cql/CqlStringOperatorsTest.xml
+++ b/tests/cql/CqlStringOperatorsTest.xml
@@ -8,7 +8,7 @@
 		</test>
 		<test name="CombineEmptyList">
 			<expression>Combine({})</expression>
-			<output>''</output>
+			<output>null</output>
 		</test>
 		<test name="CombineABC">
 			<expression>Combine({'a', 'b', 'c'})</expression>