fix python tests on powershell

tests/bugfixes/github/test_issue_1472.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+import os
 
 from system_tests import CaseMeta, CopyTmpFiles, path
 @CopyTmpFiles("$data_path/test_issue_1472.jpg")
@@ -7,8 +8,12 @@ class test_issue_1472Test(metaclass=CaseMeta):
 
     filename  = path("$tmp_path/test_issue_1472.jpg")
     exvfile   = path("$tmp_path/test_issue_1472.exv")
-    commands  = [ "rm     -rf                    $exvfile" 
-                , "$exiv2 -pa --grep LensType2   $filename"
+
+    def setUp(self):
+        if os.path.isfile(self.exvfile):
+            os.remove(self.exvfile)
+
+    commands  = [ "$exiv2 -pa --grep LensType2   $filename"
                 , "$exiv2  ex                    $filename"
                 , "$exiv2 -pa --grep LensType2   $exvfile"
                 , "$exiv2  rm                    $filename"
@@ -16,8 +21,7 @@ class test_issue_1472Test(metaclass=CaseMeta):
                 , "$exiv2  in                    $filename"
                 , "$exiv2 -pa --grep LensType2   $filename"
                 ]
-    stdout   =  [""
-                ,"Exif.Sony2010e.LensType2                     Short       1  1024\n"
+    stdout   =  ["Exif.Sony2010e.LensType2                     Short       1  1024\n"
                 ,""
                 ,"Exif.Sony2010e.LensType2                     Short       1  1024\n"
                 ,""
@@ -26,4 +30,4 @@ class test_issue_1472Test(metaclass=CaseMeta):
                 ,"Exif.Sony2010e.LensType2                     Short       1  1024\n"
                 ]
     stderr = [""]*len(commands)
-    retval = [ 0,0,0,0,0,1,0,0]
+    retval = [ 0,0,0,0,1,0,0]