diff --git a/tests/heredoctest.py b/tests/heredoctest.py
--- a/tests/heredoctest.py
+++ b/tests/heredoctest.py
@@ -1,6 +1,9 @@
 import doctest, tempfile, os, sys
 
 if __name__ == "__main__":
+    if 'TERM' in os.environ:
+        del os.environ['TERM']
+
     fd, name = tempfile.mkstemp(suffix='hg-tst')
 
     try:
diff --git a/tests/test-url.py b/tests/test-url.py
--- a/tests/test-url.py
+++ b/tests/test-url.py
@@ -1,4 +1,4 @@
-import sys
+import os
 
 def check(a, b):
     if a != b:
@@ -232,4 +232,7 @@ def test_url():
     'foo/bar/baz'
     """
 
+if 'TERM' in os.environ:
+    del os.environ['TERM']
+
 doctest.testmod(optionflags=doctest.NORMALIZE_WHITESPACE)