Testcase for vendorbranch with Tortoise SVN

Preparation:
1. create a directory "testcase" on local filesystem
2. create a subdirectory "testcase/Repo" for the Testrepository
3. create a subdirectory "testcase/WC" for working Copy of Testrepository
4. create a Repository in Subfolder "testcase/Repo" (including default-Folder-structure)
5. Check out the default-Repo-structure from repository in Checkout directory "testcase/WC".
6. Create a Subdirectory "testcase/WC/branches/vendorlib/blabla"
7. unzip "Version1.zip" in Directory "testcase". 
   Archive contains directory "version1/source" and file "version1/readme.txt".
8. copy Version1 content (directory "source" and file "readme.txt") 
   from Directory "testcase/version1" to "testcase/WC/branches/vendorlib/blabla"
9. Add unversioned files from WC to svn and do a SVN CheckIn to repo.

Test: (got an update of vendorlib "blabla")
10. unzip "Version2.zip" in directory "Testcase".
    This is the updated vendorlib "blabla" containing directory "version2/source" and "version2/readme.txt".
11. Mark content of Version2 (directory "source" and file "readme.txt") from directory "testcase/version2" 
12. and "drag-right" to "testcase/WC/branches/vendorlib/blabla" with "SNV vendorbranch here"
    -> Answer "yes" to drop vendor branch into working copy "blabla"

Result:
what I obtain: adanke empty directory "testcase/WC/branch/vendorlib/blabla".

What I expect 
updated file "readme.txt" in drectory "testcase/WC/branches/vendorlib/blabla/":
in subdirectories "testcase/WC/branches/vendorlib/blabla/source":
- updated filecontent "file_will_change.txt"   
- untouched files "file_still_here.txt" 
- deleted directory with content "codeVS_totallyOld_will_be_removed_in_next_version"
- delefted files "file_will_delete.txt"
- moved (or deleted and added) file "file_will_renamed_to_renamed.txt" to "file_renamed.txt"
- added directory "codeVS2010" with created content.