don't create lock files for unit tests

special thanks to Stephan for the configuration part

officecfg/registry/schema/org/openoffice/Office/Common.xcs

@@ -6269,6 +6269,13 @@
         </info>
         <value>true</value>
       </prop>
+      <prop oor:name="UseLocking" oor:type="xs:boolean">
+        <info>
+          <desc>Allows to specify whether locking should be used at all.
+          Use this setting only for debugging purpose.</desc>
+        </info>
+        <value>true</value>
+      </prop>
       <prop oor:name="ShowLinkWarningDialog" oor:type="xs:boolean">
         <info>
           <author>THB</author>

sfx2/source/doc/docfile.cxx

@@ -202,6 +202,31 @@ sal_Bool IsOOoLockFileUsed()
     return bOOoLockFileUsed;
 }
 
+bool IsLockingUsed()
+{
+    bool bLocking = true;
+    try
+    {
+
+        uno::Reference< uno::XInterface > xCommonConfig = ::comphelper::ConfigurationHelper::openConfig(
+                            ::comphelper::getProcessServiceFactory(),
+                            ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "/org.openoffice.Office.Common" ) ),
+                            ::comphelper::ConfigurationHelper::E_STANDARD );
+        if ( !xCommonConfig.is() )
+            throw uno::RuntimeException();
+
+        ::comphelper::ConfigurationHelper::readRelativeKey(
+                xCommonConfig,
+                ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "Misc/" ) ),
+                ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "UseLocking" ) ) ) >>= bLocking;
+    }
+    catch( const uno::Exception& )
+    {
+    }
+
+    return bLocking;
+}
+
 } // anonymous namespace
 //==========================================================
 
@@ -996,6 +1021,11 @@ sal_Bool SfxMedium::LockOrigFileOnDemand( sal_Bool bLoading, sal_Bool bNoUI )
     // if user cancel the loading the ERROR_ABORT is set
     sal_Bool bResult = sal_False;
 
+    if (!IsLockingUsed())
+    {
+        return sal_True;
+    }
+
     if ( !GetURLObject().HasError() ) try
     {
         if ( pImp->m_bLocked && bLoading && ::utl::LocalFileHelper::IsLocalFile( GetURLObject().GetMainURL( INetURLObject::NO_DECODE ) ) )

test/user-template/registry/modifications.xcd

@@ -27,6 +27,19 @@
  * instead of those above.
 -->
 <oor:data xmlns:oor="http://openoffice.org/2001/registry">
+ <oor:component-data oor:name="Common" oor:package="org.openoffice.Office">
+  <node oor:name="Misc">
+    <prop oor:name="UseDocumentSystemFileLocking">
+      <value>false</value>
+    </prop>
+    <prop oor:name="UseDocumentOOoLockFile">
+      <value>false</value>
+    </prop>
+    <prop oor:name="UseLocking">
+      <value>false</value>
+    </prop>
+  </node>
+ </oor:component-data>
  <oor:component-data oor:name="Paths" oor:package="org.openoffice.Office">
   <node oor:name="Paths">
    <node oor:name="UIConfig" oor:op="replace">