fdo#83428 Add test case for custom property dropped in docx

Reviewed on:
	https://gerrit.libreoffice.org/11346

Change-Id: I8afc0ae1351b4c8bb25f864040b99832b1bed3c1

sw/qa/extras/ooxmlexport/ooxmlexport.cxx

@@ -210,6 +210,15 @@ DECLARE_OOXMLEXPORT_TEST(testFDO83044, "fdo83044.docx")
 
     assertXPath(pXmlDoc, "/w:document/w:body/w:sdt/w:sdtPr/w:text", 1);
 }
+
+DECLARE_OOXMLEXPORT_TEST(testfdo83428, "fdo83428.docx")
+{
+     uno::Reference<document::XDocumentPropertiesSupplier> xDocumentPropertiesSupplier(mxComponent, uno::UNO_QUERY);
+     uno::Reference<document::XDocumentProperties> xProps(xDocumentPropertiesSupplier->getDocumentProperties());
+     uno::Reference<beans::XPropertySet> xUDProps(xProps->getUserDefinedProperties(), uno::UNO_QUERY);
+     CPPUNIT_ASSERT_EQUAL(OUString("Document"), getProperty<OUString>(xUDProps, "Testing"));
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
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