rtfimport test: add message with the value found on top of expected

Change-Id: Ic17d66bd2b9f4cc4124b13ef7c962649d83ee60c

sw/qa/extras/rtfimport/rtfimport.cxx

@@ -898,8 +898,11 @@ DECLARE_RTFIMPORT_TEST(testFdo52989, "fdo52989.rtf")
 {
     // Same as n#192129, but for JPEG files.
     uno::Reference<drawing::XShape> xShape(getShape(1), uno::UNO_QUERY);
+    OString aMessage("xShape->getSize().Width() = ");
+    aMessage += OString::number(xShape->getSize().Width);
+
     // This was 2, should be 423 (or 369?).
-    CPPUNIT_ASSERT(xShape->getSize().Width >= 369);
+    CPPUNIT_ASSERT_MESSAGE(aMessage.getStr(), xShape->getSize().Width >= 369);
 }
 
 DECLARE_RTFIMPORT_TEST(testFdo48442, "fdo48442.rtf")