Make test of %run more rigorous.

IPython/core/tests/test_run.py

@@ -196,12 +196,15 b' class TestMagicRunSimple(tt.TempFileMixin):'
         mydir = os.path.dirname(__file__)
         tc = os.path.join(mydir, 'tclass')
         src = ("%%run '%s' C-first\n"
-               "%%run '%s' C-second\n") % (tc, tc)
+               "%%run '%s' C-second\n"
+               "%%run '%s' C-third\n") % (tc, tc, tc)
         self.mktmp(src, '.ipy')
         out = """\
 ARGV 1-: [u'C-first']
 ARGV 1-: [u'C-second']
 tclass.py: deleting object: C-first
+ARGV 1-: [u'C-third']
 tclass.py: deleting object: C-second
+tclass.py: deleting object: C-third
 """
         tt.ipexec_validate(self.fname, out)