diff --git a/tests/cql/CqlStringOperatorsTest.xml b/tests/cql/CqlStringOperatorsTest.xml
index e1836aa..b7a408f 100644
--- a/tests/cql/CqlStringOperatorsTest.xml
+++ b/tests/cql/CqlStringOperatorsTest.xml
@@ -138,6 +138,11 @@
 			<expression>LastPositionOf('hi', 'Say hi to Ohio!')</expression>
 			<output>11</output>
 		</test>
+		<test name="LastPositionOf3" version="1.0">
+			<capability code="string-operators" />
+			<expression>LastPositionOf('', 'Say hi to Ohio!')</expression>
+			<output>15</output>
+		</test>
 	</group>
 	<group name="Length" version="1.0">
 		<capability code="string-operators" />
@@ -266,6 +271,11 @@
 			<expression>PositionOf('c', 'ab')</expression>
 			<output>-1</output>
 		</test>
+		<test name="PositionOf3" version="1.0">
+			<capability code="string-operators" />
+			<expression>PositionOf('', 'Say hi to Ohio!')</expression>
+			<output>0</output>
+		</test>
 	</group>
 	<group name="ReplaceMatches" version="1.0">
 		<capability code="string-operators" />