add test for catching bad function names

tests/expected/suites_default_post_GetRecords-filter-function-bad.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- PYCSW_VERSION -->
+<ows:ExceptionReport xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:dct="http://purl.org/dc/terms/" xmlns:ows="http://www.opengis.net/ows" xmlns:gml="http://www.opengis.net/gml" xmlns:dif="http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:ogc="http://www.opengis.net/ogc" xmlns:fgdc="http://www.opengis.net/cat/csw/csdgm" xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:os="http://a9.com/-/spec/opensearch/1.1/" xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope" xmlns:sitemap="http://www.sitemaps.org/schemas/sitemap/0.9" version="1.2.0" language="en-US" xsi:schemaLocation="http://www.opengis.net/ows http://schemas.opengis.net/ows/1.0.0/owsExceptionReport.xsd">
+  <ows:Exception locator="service" exceptionCode="InvalidRequest">
+    <ows:ExceptionText>Invalid Constraint: Invalid Filter request: Invalid ogc:Function: foo</ows:ExceptionText>
+  </ows:Exception>
+</ows:ExceptionReport>

tests/suites/default/post/GetRecords-filter-function-bad.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
+<csw:GetRecords xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:ogc="http://www.opengis.net/ogc" service="CSW" version="2.0.2" resultType="results" startPosition="1" maxRecords="5" outputFormat="application/xml" outputSchema="http://www.opengis.net/cat/csw/2.0.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd">
+    <csw:Query typeNames="csw:Record">
+        <csw:ElementSetName>brief</csw:ElementSetName>
+        <csw:Constraint version="1.1.0">
+            <ogc:Filter>
+                <ogc:PropertyIsEqualTo>
+                    <ogc:Function name="foo">
+                        <ogc:PropertyName>dc:title</ogc:PropertyName>
+                    </ogc:Function>
+                    <ogc:Literal>LOREM IPSUM</ogc:Literal>
+                </ogc:PropertyIsEqualTo>
+            </ogc:Filter>
+        </csw:Constraint>
+    </csw:Query>
+</csw:GetRecords>
+