test: force EnableHeadlessMode() for PythonTest

Clearly this should be on, but we can't easily pass in a command line
argument like is done in CppunitTest because that doesn't end up in
rtl_getAppCommandArg(), which is empty since it's the python.bin process,
so we'd have to find a way to get the argv from python first...

Change-Id: I9321a9f933f388a659643898e0dc38f295f2068c
Reviewed-on: https://gerrit.libreoffice.org/54083
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>

include/test/setupvcl.hxx

@@ -17,7 +17,7 @@
 namespace test {
 
 // Calls InitVCL etc.; needed from multiple places in the test infrastructure:
-OOO_DLLPUBLIC_TEST_SETUPVCL void setUpVcl();
+OOO_DLLPUBLIC_TEST_SETUPVCL void setUpVcl(bool forceHeadless = false);
 
 }
 

test/source/bootstrapfixture.cxx

@@ -92,7 +92,7 @@ SAL_DLLPUBLIC_EXPORT void test_init(lang::XMultiServiceFactory *pFactory)
     try
     {
         ::comphelper::setProcessServiceFactory(pFactory);
-        test::setUpVcl();
+        test::setUpVcl(true); // hard-code python tests to headless
         test_init_impl(false, true, pFactory);
     }
     catch (...) { abort(); }

test/source/setupvcl.cxx

@@ -57,7 +57,7 @@ IMPL_STATIC_LINK_NOARG(Hook, deinitHook, LinkParamNone *, void) {
 
 }
 
-void test::setUpVcl() {
+void test::setUpVcl(bool const forceHeadless) {
     // Force locale (and resource files loaded):
     OUString locale;
     if (getenv("LO_TEST_LOCALE") != nullptr)
@@ -72,7 +72,7 @@ void test::setUpVcl() {
     MsLangId::setConfiguredSystemUILanguage(tag.getLanguageType(false));
     LanguageTag::setConfiguredSystemLanguage(tag.getLanguageType(false));
     InitVCL();
-    if (isHeadless()) {
+    if (forceHeadless || isHeadless()) {
         Application::EnableHeadlessMode(false);
     }
     Application::setDeInitHook(LINK(nullptr, Hook, deinitHook));