tdf#146264: Add unit test

Make sure the text is not duplicated in the output.

Change-Id: I1600d18f0921d2ab2cb67898bc02b68f0f9b36c4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/127935
Tested-by: Jenkins
Reviewed-by: Tor Lillqvist <tml@collabora.com>

sw/qa/extras/htmlexport/xhtmlexport.cxx

@@ -54,6 +54,22 @@ DECLARE_HTMLEXPORT_TEST(testTdf131812, "tdf131812.odt")
         != -1);
 }
 
+DECLARE_HTMLEXPORT_TEST(testTdf146264, "tdf146264.odt")
+{
+    SvStream* pStream = maTempFile.GetStream(StreamMode::READ);
+    CPPUNIT_ASSERT(pStream);
+    sal_uInt64 nLength = pStream->TellEnd();
+    OString aStream(read_uInt8s_ToOString(*pStream, nLength));
+    sal_Int32 nFirstHello = aStream.indexOf("Hello");
+    CPPUNIT_ASSERT(nFirstHello > 0);
+    if (nFirstHello > 0)
+    {
+        sal_Int32 nSecondHello = aStream.indexOf("Hello", nFirstHello + 1);
+        constexpr sal_Int32 nMinusOne = -1;
+        CPPUNIT_ASSERT_EQUAL(nMinusOne, nSecondHello);
+    }
+}
+
 DECLARE_HTMLEXPORT_TEST(testTdf118637, "tdf118637.odt")
 {
     SvStream* pStream = maTempFile.GetStream(StreamMode::READ);