call site 2 for code.Source.strip
test/testing/test_repr.py - line 18
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   def test_repr_source():
       source = py.code.Source("""
       def f(x):
           pass
->     """).strip()
       config = newconfig()
       s = StringIO()
       out = getout(s)
       p = Presenter(out, config)
       p.repr_source(source, "|", 0)
       lines = s.getvalue().split("\n")
       assert len(lines) == 3
       assert lines[0].startswith("|")
       assert lines[0].find("def f(x)") != -1
       assert lines[1].find("pass") != -1