The copy tests don't need to invoke cp any longer.

tests/test-copy

@@ -5,7 +5,6 b' echo a > a'
 hg add a
 hg commit -m "1" -d "0 0"
 hg status
-cp a b
 hg copy a b
 hg status
 hg --debug commit -m "2" -d "0 0"

tests/test-copy2

@@ -6,7 +6,6 b' hg add foo'
 hg commit -m1 -d"0 0"
 
 echo "# should show copy"
-cp foo bar
 hg copy foo bar
 hg debugstate|grep '^copy'
 
@@ -25,7 +24,6 b' hg commit -m3 -d"0 0"'
 echo "# should not be renamed"
 hg debugrename bar
 
-cp foo bar
 hg copy -f foo bar
 echo "# should show copy"
 hg debugstate|grep '^copy'