From 02316a704cab7155f6feef20c9274ced985d403b Mon Sep 17 00:00:00 2001
From: Evan Gordon <evangordon.eng@gmail.com>
Date: Thu, 29 May 2025 00:29:01 +0000
Subject: [PATCH] Added a substring test case for an empty string and zero
 index.

---
 tests/cql/CqlStringOperatorsTest.xml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/cql/CqlStringOperatorsTest.xml b/tests/cql/CqlStringOperatorsTest.xml
index f9edbe9..c1cdd36 100644
--- a/tests/cql/CqlStringOperatorsTest.xml
+++ b/tests/cql/CqlStringOperatorsTest.xml
@@ -301,6 +301,10 @@
 			<expression>Substring('ab', -1)</expression>
 			<output>null</output>
 		</test>
+		<test name="SubstringEmptyAnd0">
+			<expression>Substring('', 0)</expression>
+			<output>''</output>
+		</test>
 		<test name="SubstringAB0To1">
 			<expression>Substring('ab', 0, 1)</expression>
 			<output>'a'</output>