ui-tests: let SetWorkTree() accept a directory base name

This base name should be different for the different UI tests (once we
have more than one) so that they do not clash.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

ui-tests/background-hook.ahk

@@ -11,7 +11,7 @@
 ; This was fixed in the Cygwin/MSYS2 runtime, but then regressed again.
 ; This test is meant to verify that the issue is fixed and remains so.
 
-SetWorkTree()
+SetWorkTree('git-test-background-hook')
 
 SetWorkingDir(EnvGet('TEMP'))
 Info 'uname: ' RunWaitOne('uname -a')

ui-tests/ui-test-library.ahk

@@ -1,6 +1,6 @@
 ; Reusable library functions for the UI tests.
 
-SetWorkTree() {
+SetWorkTree(defaultName) {
     global workTree
     ; First, set the worktree path; This path will be reused
     ; for the `.log` file).
@@ -9,7 +9,7 @@ SetWorkTree() {
     else
     {
         ; Create a unique worktree path in the TEMP directory.
-        workTree := EnvGet('TEMP') . '\git-test-background-hook'
+        workTree := EnvGet('TEMP') . '\' . defaultName
         if FileExist(workTree)
         {
             counter := 0