--- a/tests/run-tests.py	Mon Mar 09 01:11:59 2020 +0100
+++ b/tests/run-tests.py	Tue Mar 10 16:47:02 2020 +0100
@@ -1626,7 +1626,7 @@
             return self._have.get(allreqs)
 
         # TODO do something smarter when all other uses of hghave are gone.
-        runtestdir = os.path.abspath(os.path.dirname(_bytespath(__file__)))
+        runtestdir = osenvironb[b'RUNTESTDIR']
         tdir = runtestdir.replace(b'\\', b'/')
         proc = Popen4(
             b'%s -c "%s/hghave %s"' % (self._shell, tdir, allreqs),