skip tests that want to invoke py.test without proper installation

--HG--
branch : trunk

pytest/plugin/pytester.py

@@ -425,12 +425,7 @@ class TmpTestdir:
             assert script, "script %r not found" % scriptname
             return (script,)
         else:
-            cmdlinename = scriptname.replace(".", "")
-            assert hasattr(py.cmdline, cmdlinename), cmdlinename
-            source = ("import sys;sys.path.insert(0,%r);"
-                      "import py;py.cmdline.%s()" %
-                (str(py._pydir.dirpath()), cmdlinename))
-            return (sys.executable, "-c", source,)
+            py.test.skip("cannot run %r with --no-tools-on-path" % scriptname)
 
     def runpython(self, script, prepend=True):
         if prepend:

tox.ini

@@ -44,5 +44,5 @@ basepython=pypy-c
 [testenv:jython]
 changedir=testing
 commands=
-    {envpython} {envbindir}/py.test-jython \
+    {envpython} {envbindir}/py.test-jython --no-tools-on-path \
         -rfsxX --junitxml={envlogdir}/junit-{envname}2.xml [acceptance_test.py plugin]