make bench.py accept an optional script name and add a slow "manyparam" test

bench/bench.py

@@ -1,9 +1,11 @@
+import sys
 
 if __name__ == '__main__':
     import cProfile
     import py
     import pstats
-    stats = cProfile.run('py.test.cmdline.main(["skip.py", ])', 'prof')
+    script = sys.argv[1] if len(sys.argv) > 1 else "empty.py"
+    stats = cProfile.run('py.test.cmdline.main([%r])' % script, 'prof')
     p = pstats.Stats("prof")
     p.strip_dirs()
     p.sort_stats('cumulative')

bench/manyparam.py

@@ -0,0 +1,12 @@
+
+import pytest
+
+@pytest.fixture(scope='module', params=range(966))
+def foo(request):
+    return request.param
+
+def test_it(foo):
+    pass
+def test_it2(foo):
+    pass
+