tests: clarify demandimport disabled state

tests/test-demandimport.py

@@ -1,70 +1,71 b''
 from __future__ import print_function
 
 from mercurial import demandimport
 demandimport.enable()
 
 import os
 import subprocess
 import sys
 
 # Only run if demandimport is allowed
 if subprocess.call(['python', '%s/hghave' % os.environ['TESTDIR'],
                     'demandimport']):
     sys.exit(80)
 
 if os.name != 'nt':
     try:
         import distutils.msvc9compiler
         print('distutils.msvc9compiler needs to be an immediate '
               'importerror on non-windows platforms')
         distutils.msvc9compiler
     except ImportError:
         pass
 
 import re
 
 rsub = re.sub
 def f(obj):
     l = repr(obj)
     l = rsub("0x[0-9a-fA-F]+", "0x?", l)
     l = rsub("from '.*'", "from '?'", l)
     l = rsub("'<[a-z]*>'", "'<whatever>'", l)
     return l
 
 import os
 
 print("os =", f(os))
 print("os.system =", f(os.system))
 print("os =", f(os))
 
 from mercurial import util
 
 print("util =", f(util))
 print("util.system =", f(util.system))
 print("util =", f(util))
 print("util.system =", f(util.system))
 
 from mercurial import hgweb
 print("hgweb =", f(hgweb))
 print("hgweb_mod =", f(hgweb.hgweb_mod))
 print("hgweb =", f(hgweb))
 
 import re as fred
 print("fred =", f(fred))
 
 import sys as re
 print("re =", f(re))
 
 print("fred =", f(fred))
 print("fred.sub =", f(fred.sub))
 print("fred =", f(fred))
 
 print("re =", f(re))
 print("re.stderr =", f(re.stderr))
 print("re =", f(re))
 
 demandimport.disable()
 os.environ['HGDEMANDIMPORT'] = 'disable'
+# this enable call should not actually enable demandimport!
 demandimport.enable()
 from mercurial import node
 print("node =", f(node))