portability fixes for some tests

Apparently the ls on OS X 10.3.9 exits with success even if the file
given on the command line doesn't exist

tests/test-bad-pull

@@ -1,27 +1,27 b''
 #!/bin/sh
 
 hg clone http://localhost:20059/ copy
 echo $?
-ls copy 2>/dev/null || echo copy: No such file or directory
+test -e copy || echo copy: No such file or directory
 
 cat > dumb.py <<EOF
 import BaseHTTPServer, SimpleHTTPServer, signal
 
 def run(server_class=BaseHTTPServer.HTTPServer,
         handler_class=SimpleHTTPServer.SimpleHTTPRequestHandler):
     server_address = ('localhost', 20059)
     httpd = server_class(server_address, handler_class)
     httpd.serve_forever()
 
 signal.signal(signal.SIGTERM, lambda x: sys.exit(0))
 run()
 EOF
 
 python dumb.py 2>/dev/null &
 echo $! >> $DAEMON_PIDS
 
 http_proxy= hg clone http://localhost:20059/foo copy2 2>&1 | \
     sed -e 's/404.*/404/' -e 's/Date:.*/Date:/'
 echo $?
 
 kill $!

tests/test-empty-dir

@@ -1,16 +1,16 b''
 #!/bin/sh
 
 hg init
 echo 123 > a
 hg add a
 hg commit -m "first" -d "1000000 0" a
 mkdir sub
 echo 321 > sub/b
 hg add sub/b
 hg commit -m "second" -d "1000000 0" sub/b
 cat sub/b
 hg co 0
 cat sub/b 2>/dev/null || echo "sub/b not present"
-ls sub 2>/dev/null || echo "sub not present"
+test -e sub || echo "sub not present"
 
 true

tests/test-static-http

@@ -1,50 +1,50 b''
 #!/bin/sh
 
 http_proxy= hg clone static-http://localhost:20059/ copy
 echo $?
-ls copy 2>/dev/null || echo copy: No such file or directory
+test -e copy || echo copy: No such file or directory
 
 # This server doesn't do range requests so it's basically only good for
 # one pull
 cat > dumb.py <<EOF
 import BaseHTTPServer, SimpleHTTPServer, signal
 
 def run(server_class=BaseHTTPServer.HTTPServer,
         handler_class=SimpleHTTPServer.SimpleHTTPRequestHandler):
     server_address = ('localhost', 20059)
     httpd = server_class(server_address, handler_class)
     httpd.serve_forever()
 
 signal.signal(signal.SIGTERM, lambda x: sys.exit(0))
 run()
 EOF
 
 python dumb.py 2>/dev/null &
 echo $! >> $DAEMON_PIDS
 
 mkdir remote
 cd remote
 hg init
 echo foo > bar
 hg add bar
 hg commit -m"test" -d "1000000 0"
 hg tip
 
 cd ..
 
 http_proxy= hg clone static-http://localhost:20059/remote local
 
 cd local
 hg verify
 cat bar
 
 cd ../remote
 echo baz > quux
 hg commit -A -mtest2 -d '100000000 0'
 
 cd ../local
 echo '[hooks]' >> .hg/hgrc
 echo 'changegroup = echo changegroup: u=$HG_URL' >> .hg/hgrc
 http_proxy= hg pull
 
 kill $!