extend test, so it checks the retireved graphic is as expected

Change-Id: I49f852681a5d3541da23d1d590cac14b6e4f8e6a
Reviewed-on: https://gerrit.libreoffice.org/53491Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

sw/qa/extras/ooxmlexport/ooxmlexport4.cxx

@@ -183,6 +183,9 @@ DECLARE_OOXMLEXPORT_TEST(testTextBoxPictureFill, "textbox_picturefill.docx")
     CPPUNIT_ASSERT(xGraphic.is());
     Graphic aGraphic(xGraphic);
     CPPUNIT_ASSERT(aGraphic);
+    CPPUNIT_ASSERT(aGraphic.GetSizeBytes() > 0L);
+    CPPUNIT_ASSERT_EQUAL(447L, aGraphic.GetSizePixel().Width());
+    CPPUNIT_ASSERT_EQUAL(528L, aGraphic.GetSizePixel().Height());
 }
 
 DECLARE_OOXMLEXPORT_TEST(testFDO73034, "FDO73034.docx")