CppunitTest_sw_htmlexport: The actual PNG data does not matter.

The test was supposed to test whether the PNG data is embedded (or not),
not the actual content of the data.  Turns out that a different zlib
affects the PNG content, so let's ignore that part, and only check that
the data is actually embedded.

Change-Id: I603bd546d97abda7c47248db0a95349f4a48b4aa
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/101329
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

sw/qa/extras/htmlexport/htmlexport.cxx

@@ -357,6 +357,8 @@ DECLARE_HTMLEXPORT_TEST(testNormalImageExport, "textAndImage.docx")
     CPPUNIT_ASSERT(pDoc);
 
     assertXPath(pDoc, "/html/body", 1);
+
+    // the HTML export normally does not embed the images
     OUString imgSrc = getXPath(pDoc, "/html/body/p/img", "src");
     CPPUNIT_ASSERT(imgSrc.endsWith(".png"));
 }
@@ -367,7 +369,13 @@ DECLARE_HTMLEXPORT_TEST(testEmbedImagesEnabled, "textAndImage.docx")
     CPPUNIT_ASSERT(pDoc);
 
     assertXPath(pDoc, "/html/body", 1);
-    assertXPath(pDoc, "/html/body/p/img", "src", "data:image/png;base64,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");
+
+    // the HTML export normally does not embed the images, but here the test
+    // name triggers setting of the "EmbedImages" filter option, meaning the
+    // image will not be a separate PNG, but an embedded base64 encoded
+    // version of that
+    OUString imgSrc = getXPath(pDoc, "/html/body/p/img", "src");
+    CPPUNIT_ASSERT(imgSrc.startsWith("data:image/png;base64,"));
 }
 
 DECLARE_HTMLEXPORT_TEST(testXHTML, "hello.html")