diff --git a/tests/svnurlof.py b/tests/svnurlof.py
new file mode 100644
--- /dev/null
+++ b/tests/svnurlof.py
@@ -0,0 +1,17 @@
+import sys
+
+from mercurial import (
+    pycompat,
+    util,
+)
+
+def main(argv):
+    enc = util.urlreq.quote(pycompat.sysbytes(argv[1]))
+    if pycompat.iswindows:
+        fmt = 'file:///%s'
+    else:
+        fmt = 'file://%s'
+    print(fmt % pycompat.sysstr(enc))
+
+if __name__ == '__main__':
+    main(sys.argv)
diff --git a/tests/test-convert-hg-svn.t b/tests/test-convert-hg-svn.t
--- a/tests/test-convert-hg-svn.t
+++ b/tests/test-convert-hg-svn.t
@@ -11,11 +11,7 @@
   > EOF
 
   $ SVNREPOPATH=`pwd`/svn-repo
-#if windows
-  $ SVNREPOURL=file:///`"$PYTHON" -c "import urllib, sys; sys.stdout.write(urllib.quote(sys.argv[1]))" "$SVNREPOPATH"`
-#else
-  $ SVNREPOURL=file://`"$PYTHON" -c "import urllib, sys; sys.stdout.write(urllib.quote(sys.argv[1]))" "$SVNREPOPATH"`
-#endif
+  $ SVNREPOURL="`$PYTHON $TESTDIR/svnurlof.py \"$SVNREPOPATH\"`"
 
   $ svnadmin create "$SVNREPOPATH"
   $ cat > "$SVNREPOPATH"/hooks/pre-revprop-change <<EOF
diff --git a/tests/test-convert-svn-move.t b/tests/test-convert-svn-move.t
--- a/tests/test-convert-svn-move.t
+++ b/tests/test-convert-svn-move.t
@@ -8,11 +8,7 @@
   $ svnadmin create svn-repo
   $ svnadmin load -q svn-repo < "$TESTDIR/svn/move.svndump"
   $ SVNREPOPATH=`pwd`/svn-repo
-#if windows
-  $ SVNREPOURL=file:///`"$PYTHON" -c "import urllib, sys; sys.stdout.write(urllib.quote(sys.argv[1]))" "$SVNREPOPATH"`
-#else
-  $ SVNREPOURL=file://`"$PYTHON" -c "import urllib, sys; sys.stdout.write(urllib.quote(sys.argv[1]))" "$SVNREPOPATH"`
-#endif
+  $ SVNREPOURL="`$PYTHON $TESTDIR/svnurlof.py \"$SVNREPOPATH\"`"
 
 Convert trunk and branches
 
diff --git a/tests/test-convert-svn-source.t b/tests/test-convert-svn-source.t
--- a/tests/test-convert-svn-source.t
+++ b/tests/test-convert-svn-source.t
@@ -13,11 +13,7 @@
 
   $ svnadmin create svn-repo
   $ SVNREPOPATH=`pwd`/svn-repo
-#if windows
-  $ SVNREPOURL=file:///`"$PYTHON" -c "import urllib, sys; sys.stdout.write(urllib.quote(sys.argv[1]))" "$SVNREPOPATH"`
-#else
-  $ SVNREPOURL=file://`"$PYTHON" -c "import urllib, sys; sys.stdout.write(urllib.quote(sys.argv[1]))" "$SVNREPOPATH"`
-#endif
+  $ SVNREPOURL="`$PYTHON $TESTDIR/svnurlof.py \"$SVNREPOPATH\"`"
   $ INVALIDREVISIONID=svn:x2147622-4a9f-4db4-a8d3-13562ff547b2/proj%20B/mytrunk@1
   $ VALIDREVISIONID=svn:a2147622-4a9f-4db4-a8d3-13562ff547b2/proj%20B/mytrunk/mytrunk@1
 
diff --git a/tests/test-mq-subrepo-svn.t b/tests/test-mq-subrepo-svn.t
--- a/tests/test-mq-subrepo-svn.t
+++ b/tests/test-mq-subrepo-svn.t
@@ -23,18 +23,7 @@
   $ svnadmin create svn-repo-2499
 
   $ SVNREPOPATH=`pwd`/svn-repo-2499/project
-
-#if py3
-  $ pathquoted=`"$PYTHON" -c "import sys, urllib.parse; sys.stdout.write(urllib.parse.quote(sys.argv[1]))" "$SVNREPOPATH"`
-#else
-  $ pathquoted=`"$PYTHON" -c "import sys, urllib; sys.stdout.write(urllib.quote(sys.argv[1]))" "$SVNREPOPATH"`
-#endif
-
-#if windows
-  $ SVNREPOURL=file:///$pathquoted
-#else
-  $ SVNREPOURL=file://$pathquoted
-#endif
+  $ SVNREPOURL="`$PYTHON $TESTDIR/svnurlof.py \"$SVNREPOPATH\"`"
 
   $ mkdir -p svn-project-2499/trunk
   $ svn import -qm 'init project' svn-project-2499 "$SVNREPOURL"
diff --git a/tests/test-subrepo-svn.t b/tests/test-subrepo-svn.t
--- a/tests/test-subrepo-svn.t
+++ b/tests/test-subrepo-svn.t
@@ -1,11 +1,7 @@
 #require svn15
 
   $ SVNREPOPATH=`pwd`/svn-repo
-#if windows
-  $ SVNREPOURL=file:///`"$PYTHON" -c "import urllib, sys; sys.stdout.write(urllib.quote(sys.argv[1]))" "$SVNREPOPATH"`
-#else
-  $ SVNREPOURL=file://`"$PYTHON" -c "import urllib, sys; sys.stdout.write(urllib.quote(sys.argv[1]))" "$SVNREPOPATH"`
-#endif
+  $ SVNREPOURL="`$PYTHON $TESTDIR/svnurlof.py \"$SVNREPOPATH\"`"
 
   $ filter_svn_output () {
   >     egrep -v 'Committing|Transmitting|Updating|(^$)' || true