test python hook configured with python:[file]:[hook] syntax

Adds a test for python hooks configured with python:[file]:[hook] syntax
in .hgrc. Increases the test coverage for mercurial/hook from 92% (79/85)
to 96% (82/85).

tests/test-hook

@@ -230,4 +230,22 b" hg ci --debug -m 'change foo' | sed -e '"
 
 hg showconfig hooks | sed -e 's/ at .*>/>/'
 
+echo '# test python hook configured with python:[file]:[hook] syntax'
+cd ..
+mkdir d
+cd d
+hg init repo
+mkdir hooks
+
+cd hooks
+cat > testhooks.py <<EOF
+def testhook(**args):
+    print 'hook works'
+EOF
+echo '[hooks]' > ../repo/.hg/hgrc
+echo "pre-commit.test = python:`pwd`/testhooks.py:testhook" >> ../repo/.hg/hgrc
+
+cd ../repo
+hg commit
+
 exit 0

tests/test-hook.out

@@ -160,3 +160,6 b' calling hook commit.auto: <function auto'
 Automatically installed hook
 committed changeset 1:52998019f6252a2b893452765fcb0a47351a5708
 hooks.commit.auto=<function autohook>
+# test python hook configured with python:[file]:[hook] syntax
+hook works
+nothing changed