--- a/tests/README
+++ b/tests/README
@@ -31,3 +31,6 @@ writing tests:
   use hg diff | sed -e "s/\(+++ [a-zA-Z0-9_/.-]*\).*/\1/" \
                     -e "s/\(--- [a-zA-Z0-9_/.-]*\).*/\1/"
   to strip dates
+
+- You can append your own hgrc settings to the file that the environment
+  variable HGRCPATH points to. This file is cleared before running a test.

--- a/tests/test-abort-checkin
+++ b/tests/test-abort-checkin
@@ -1,8 +1,7 @@
 #!/bin/sh
 
-HGRCPATH=$HGTMP/.hgrc; export HGRCPATH
-echo "[extensions]" >> $HGTMP/.hgrc
-echo "mq=" >> $HGTMP/.hgrc
+echo "[extensions]" >> $HGRCPATH
+echo "mq=" >> $HGRCPATH
 cat > $HGTMP/false <<EOF
 #!/bin/sh
 exit 1

--- a/tests/test-bisect
+++ b/tests/test-bisect
@@ -2,9 +2,8 @@
 
 set -e
 
-HGRCPATH=$HGTMP/.hgrc; export HGRCPATH
-echo "[extensions]" >> $HGTMP/.hgrc
-echo "hbisect=" >> $HGTMP/.hgrc
+echo "[extensions]" >> $HGRCPATH
+echo "hbisect=" >> $HGRCPATH
 
 echo % init
 hg init

--- a/tests/test-extdiff
+++ b/tests/test-extdiff
@@ -1,8 +1,7 @@
 #!/bin/sh
 
-HGRCPATH=$HGTMP/.hgrc; export HGRCPATH
-echo "[extensions]" >> $HGTMP/.hgrc
-echo "extdiff=" >> $HGTMP/.hgrc
+echo "[extensions]" >> $HGRCPATH
+echo "extdiff=" >> $HGRCPATH
 
 hg init a
 cd a
@@ -14,9 +13,9 @@ if [ $? -ne 0 ]; then
 fi
 hg extdiff -o -Nr $opt
 
-echo "[extdiff]" >> $HGTMP/.hgrc
-echo "cmd.falabala=echo" >> $HGTMP/.hgrc
-echo "opts.falabala=diffing" >> $HGTMP/.hgrc
+echo "[extdiff]" >> $HGRCPATH
+echo "cmd.falabala=echo" >> $HGRCPATH
+echo "opts.falabala=diffing" >> $HGRCPATH
 
 hg falabala
 

--- a/tests/test-fetch
+++ b/tests/test-fetch
@@ -1,8 +1,7 @@
 #!/bin/sh
 
-HGRCPATH=$HGTMP/.hgrc; export HGRCPATH
-echo "[extensions]" >> $HGTMP/.hgrc
-echo "fetch=" >> $HGTMP/.hgrc
+echo "[extensions]" >> $HGRCPATH
+echo "fetch=" >> $HGRCPATH
 
 hg init a
 echo a > a/a

--- a/tests/test-mq
+++ b/tests/test-mq
@@ -1,8 +1,7 @@
 #!/bin/sh
 
-HGRCPATH=$HGTMP/.hgrc; export HGRCPATH
-echo "[extensions]" >> $HGTMP/.hgrc
-echo "mq=" >> $HGTMP/.hgrc
+echo "[extensions]" >> $HGRCPATH
+echo "mq=" >> $HGRCPATH
 
 echo % help
 hg help mq
@@ -127,7 +126,7 @@ hg ci -Ama
 hg strip tip 2>&1 | sed 's/\(saving bundle to \).*/\1/'
 hg unbundle .hg/strip-backup/*
 
-cat >>$HGTMP/.hgrc <<EOF
+cat >>$HGRCPATH <<EOF
 [diff]
 git = True
 EOF

--- a/tests/test-mq-guards
+++ b/tests/test-mq-guards
@@ -1,8 +1,7 @@
 #!/bin/sh
 
-HGRCPATH=$HGTMP/.hgrc; export HGRCPATH
-echo "[extensions]" >> $HGTMP/.hgrc
-echo "mq=" >> $HGTMP/.hgrc
+echo "[extensions]" >> $HGRCPATH
+echo "mq=" >> $HGRCPATH
 
 hg init
 hg qinit

--- a/tests/test-mq-qdiff
+++ b/tests/test-mq-qdiff
@@ -1,8 +1,7 @@
 #!/bin/sh
 
-HGRCPATH=$HGTMP/.hgrc; export HGRCPATH
-echo "[extensions]" >> $HGTMP/.hgrc
-echo "mq=" >> $HGTMP/.hgrc
+echo "[extensions]" >> $HGRCPATH
+echo "mq=" >> $HGRCPATH
 
 echo % init
 hg init a

--- a/tests/test-mq-qnew-twice
+++ b/tests/test-mq-qnew-twice
@@ -1,8 +1,7 @@
 #!/bin/sh
 
-HGRCPATH=$HGTMP/.hgrc; export HGRCPATH
-echo "[extensions]" >> $HGTMP/.hgrc
-echo "mq=" >> $HGTMP/.hgrc
+echo "[extensions]" >> $HGRCPATH
+echo "mq=" >> $HGRCPATH
 
 hg init a
 cd a

--- a/tests/test-mq-qrefresh-replace-log-message
+++ b/tests/test-mq-qrefresh-replace-log-message
@@ -1,9 +1,8 @@
 #!/bin/sh
 
 # Environement setup for MQ
-HGRCPATH=$HGTMP/.hgrc; export HGRCPATH
-echo "[extensions]" >> $HGTMP/.hgrc
-echo "mq=" >> $HGTMP/.hgrc
+echo "[extensions]" >> $HGRCPATH
+echo "mq=" >> $HGRCPATH
 
 #Repo init
 hg init

--- a/tests/test-mq-qsave
+++ b/tests/test-mq-qsave
@@ -1,8 +1,7 @@
 #!/bin/sh
 
-HGRCPATH=$HGTMP/.hgrc; export HGRCPATH
-echo "[extensions]" >> $HGTMP/.hgrc
-echo "mq=" >> $HGTMP/.hgrc
+echo "[extensions]" >> $HGRCPATH
+echo "mq=" >> $HGRCPATH
 
 hg init a
 cd a