Added a unit test to check the integrity of all XML doc pages

src/lay/lay/layHelpSource.h

@@ -70,7 +70,7 @@ std::string escape_xml (const std::string &s);
 /**
  *  @brief A specialization of BrowserSource for delivering the generated documentation
  */
-class HelpSource
+class LAY_PUBLIC HelpSource
   : public BrowserSource
 {
 public:

src/lay/unit_tests/layHelpIndexTest.cc

@@ -0,0 +1,33 @@
+
+/*
+
+  KLayout Layout Viewer
+  Copyright (C) 2006-2022 Matthias Koefferlein
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+*/
+
+
+#include "layHelpSource.h"
+#include "tlUnitTest.h"
+
+TEST (1)
+{
+  //  tests whether the index can be built - i.e. all XML files
+  //  are valid.
+  lay::HelpSource help_source (false /*don't load index file*/);
+  help_source.scan ();
+}

src/lay/unit_tests/unit_tests.pro

@@ -8,6 +8,7 @@ include($$PWD/../../lib_ut.pri)
 
 SOURCES = \
   laySalt.cc \
+  layHelpIndexTest.cc \
   laySessionTests.cc
 
 INCLUDEPATH += $$LAY_INC $$TL_INC $$LAYBASIC_INC $$LAYUI_INC $$LAYVIEW_INC $$DB_INC $$GSI_INC $$ANT_INC $$IMG_INC $$RDB_INC

src/unit_tests/unit_test_main.cc

@@ -41,6 +41,10 @@
 //  This hard-links the GSI test classes
 #include "../gsi_test/gsiTestForceLink.h"
 
+//  For testing the document structure
+#include "docForceLink.h"
+#include "iconsForceLink.h"
+
 #include "version.h"
 
 #if defined(HAVE_QT)

src/unit_tests/unit_tests.pro

@@ -4,6 +4,13 @@ DESTDIR = $$OUT_PWD/..
 include($$PWD/../klayout.pri)
 include($$PWD/../with_all_libs.pri)
 
+# NOTE: doc is needed for testing help sources
+
+INCLUDEPATH += $$DOC_INC $$ICONS_INC
+DEPENDPATH += $$DOC_INC $$ICONS_INC
+
+LIBS += -lklayout_doc -lklayout_icons
+
 TEMPLATE = app
 
 # Don't build the ut_runner app as ordinary command line tool on MacOS