/External.LCA_RESTRICTED/Languages/IronPython/27/Lib/lib2to3/tests/test_fixers.py

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""" Test suite for the fixer modules """

# Python imports
import os
import unittest
from itertools import chain
from operator import itemgetter

# Local imports
from lib2to3 import pygram, pytree, refactor, fixer_util
from lib2to3.tests import support


class FixerTestCase(support.TestCase):

    # Other test cases can subclass this class and replace "fixer_pkg" with
    # their own.
    def setUp(self, fix_list=None, fixer_pkg="lib2to3", options=None):
        if fix_list is None:
            fix_list = [self.fixer]
        self.refactor = support.get_refactorer(fixer_pkg, fix_list, options)
        self.fixer_log = []
        self.filename = u"<string>"

        for fixer in chain(self.refactor.pre_order,
                           self.refactor.post_order):
            fixer.log = self.fixer_log

    def _check(self, before, after):
        before = support.reformat(before)
        after = support.reformat(after)
        tree = self.refactor.refactor_string(before, self.filename)
        self.assertEqual(after, unicode(tree))
        return tree

    def check(self, before, after, ignore_warnings=False):
        tree = self._check(before, after)
        self.assertTrue(tree.was_changed)
        if not ignore_warnings:
            self.assertEqual(self.fixer_log, [])

    def warns(self, before, after, message, unchanged=False):
        tree = self._check(before, after)
        self.assertIn(message, "".join(self.fixer_log))
        if not unchanged:
            self.assertTrue(tree.was_changed)

    def warns_unchanged(self, before, message):
        self.warns(before, before, message, unchanged=True)

    def unchanged(self, before, ignore_warnings=False):
        self._check(before, before)
        if not ignore_warnings:
            self.assertEqual(self.fixer_log, [])

    def assert_runs_after(self, *names):
        fixes = [self.fixer]
        fixes.extend(names)
        r = support.get_refactorer("lib2to3", fixes)
        (pre, post) = r.get_fixers()
        n = "fix_" + self.fixer
        if post and post[-1].__class__.__module__.endswith(n):
            # We're the last fixer to run
            return
        if pre and pre[-1].__class__.__module__.endswith(n) and not post:
            # We're the last in pre and post is empty
            return
        self.fail("Fixer run order (%s) is incorrect; %s should be last."\
               %(", ".join([x.__class__.__module__ for x in (pre+post)]), n))

class Test_ne(FixerTestCase):
    fixer = "ne"

    def test_basic(self):
        b = """if x <> y:
            pass"""

        a = """if x != y:
            pass"""
        self.check(b, a)

    def test_no_spaces(self):
        b = """if x<>y:
            pass"""

        a = """if x!=y:
            pass"""
        self.check(b, a)

    def test_chained(self):
        b = """if x<>y<>z:
            pass"""

        a = """if x!=y!=z:
            pass"""
        self.check(b, a)

class Test_has_key(FixerTestCase):
    fixer = "has_key"

    def test_1(self):
        b = """x = d.has_key("x") or d.has_key("y")"""
        a = """x = "x" in d or "y" in d"""
        self.check(b, a)

    def test_2(self):
        b = """x = a.b.c.d.has_key("x") ** 3"""
        a = """x = ("x" in a.b.c.d) ** 3"""
        self.check(b, a)

    def test_3(self):
        b = """x = a.b.has_key(1 + 2).__repr__()"""
        a = """x = (1 + 2 in a.b).__repr__()"""
        self.check(b, a)

    def test_4(self):
        b = """x = a.b.has_key(1 + 2).__repr__() ** -3 ** 4"""
        a = """x = (1 + 2 in a.b).__repr__() ** -3 ** 4"""
        self.check(b, a)

    def test_5(self):
        b = """x = a.has_key(f or g)"""
        a = """x = (f or g) in a"""
        self.check(b, a)

    def test_6(self):
        b = """x = a + b.has_key(c)"""
        a = """x = a + (c in b)"""
        self.check(b, a)

    def test_7(self):
        b = """x = a.has_key(lambda: 12)"""
        a = """x = (lambda: 12) in a"""
        self.check(b, a)

    def test_8(self):
        b = """x = a.has_key(a for a in b)"""
        a = """x = (a for a in b) in a"""
        self.check(b, a)

    def test_9(self):
        b = """if not a.has_key(b): pass"""
        a = """if b not in a: pass"""
        self.check(b, a)

    def test_10(self):
        b = """if not a.has_key(b).__repr__(): pass"""
        a = """if not (b in a).__repr__(): pass"""
        self.check(b, a)

    def test_11(self):
        b = """if not a.has_key(b) ** 2: pass"""
        a = """if not (b in a) ** 2: pass"""
        self.check(b, a)

class Test_apply(FixerTestCase):
    fixer = "apply"

    def test_1(self):
        b = """x = apply(f, g + h)"""
        a = """x = f(*g + h)"""
        self.check(b, a)

    def test_2(self):
        b = """y = apply(f, g, h)"""
        a = """y = f(*g, **h)"""
        self.check(b, a)

    def test_3(self):
        b = """z = apply(fs[0], g or h, h or g)"""
        a = """z = fs[0](*g or h, **h or g)"""
        self.check(b, a)

    def test_4(self):
        b = """apply(f, (x, y) + t)"""
        a = """f(*(x, y) + t)"""
        self.check(b, a)

    def test_5(self):
        b = """apply(f, args,)"""
        a = """f(*args)"""
        self.check(b, a)

    def test_6(self):
        b = """apply(f, args, kwds,)"""
        a = """f(*args, **kwds)"""
        self.check(b, a)

    # Test that complex functions are parenthesized

    def test_complex_1(self):
        b = """x = apply(f+g, args)"""
        a = """x = (f+g)(*args)"""
        self.check(b, a)

    def test_complex_2(self):
        b = """x = apply(f*g, args)"""
        a = """x = (f*g)(*args)"""
        self.check(b, a)

    def test_complex_3(self):
        b = """x = apply(f**g, args)"""
        a = """x = (f**g)(*args)"""
        self.check(b, a)

    # But dotted names etc. not

    def test_dotted_name(self):
        b = """x = apply(f.g, args)"""
        a = """x = f.g(*args)"""
        self.check(b, a)

    def test_subscript(self):
        b = """x = apply(f[x], args)"""
        a = """x = f[x](*args)"""
        self.check(b, a)

    def test_call(self):
        b = """x = apply(f(), args)"""
        a = """x = f()(*args)"""
        self.check(b, a)

    # Extreme case
    def test_extreme(self):
        b = """x = apply(a.b.c.d.e.f, args, kwds)"""
        a = """x = a.b.c.d.e.f(*args, **kwds)"""
        self.check(b, a)

    # XXX Comments in weird places still get lost
    def test_weird_comments(self):
        b = """apply(   # foo
          f, # bar
          args)"""
        a = """f(*args)"""
        self.check(b, a)

    # These should *not* be touched

    def test_unchanged_1(self):
        s = """apply()"""
        self.unchanged(s)

    def test_unchanged_2(self):
        s = """apply(f)"""
        self.unchanged(s)

    def test_unchanged_3(self):
        s = """apply(f,)"""
        self.unchanged(s)

    def test_unchanged_4(self):
        s = """apply(f, args, kwds, extras)"""
        self.unchanged(s)

    def test_unchanged_5(self):
        s = """apply(f, *args, **kwds)"""
        self.unchanged(s)

    def test_unchanged_6(self):
        s = """apply(f, *args)"""
        self.unchanged(s)

    def test_unchanged_7(self):
        s = """apply(func=f, args=args, kwds=kwds)"""
        self.unchanged(s)

    def test_unchanged_8(self):
        s = """apply(f, args=args, kwds=kwds)"""
        self.unchanged(s)

    def test_unchanged_9(self):
        s = """apply(f, args, kwds=kwds)"""
        self.unchanged(s)

    def test_space_1(self):
        a = """apply(  f,  args,   kwds)"""
        b = """f(*args, **kwds)"""
        self.check(a, b)

    def test_space_2(self):
        a = """apply(  f  ,args,kwds   )"""
        b = """f(*args, **kwds)"""
        self.check(a, b)

class Test_intern(FixerTestCase):
    fixer = "intern"

    def test_prefix_preservation(self):
        b = """x =   intern(  a  )"""
        a = """import sys\nx =   sys.intern(  a  )"""
        self.check(b, a)

        b = """y = intern("b" # test
              )"""
        a = """import sys\ny = sys.intern("b" # test
              )"""
        self.check(b, a)

        b = """z = intern(a+b+c.d,   )"""
        a = """import sys\nz = sys.intern(a+b+c.d,   )"""
        self.check(b, a)

    def test(self):
        b = """x = intern(a)"""
        a = """import sys\nx = sys.intern(a)"""
        self.check(b, a)

        b = """z = intern(a+b+c.d,)"""
        a = """import sys\nz = sys.intern(a+b+c.d,)"""
        self.check(b, a)

        b = """intern("y%s" % 5).replace("y", "")"""
        a = """import sys\nsys.intern("y%s" % 5).replace("y", "")"""
        self.check(b, a)

    # These should not be refactored

    def test_unchanged(self):
        s = """intern(a=1)"""
        self.unchanged(s)

        s = """intern(f, g)"""
        self.unchanged(s)

        s = """intern(*h)"""
        self.unchanged(s)

        s = """intern(**i)"""
        self.unchanged(s)

        s = """intern()"""
        self.unchanged(s)

class Test_reduce(FixerTestCase):
    fixer = "reduce"

    def test_simple_call(self):
        b = "reduce(a, b, c)"
        a = "from functools import reduce\nreduce(a, b, c)"
        self.check(b, a)

    def test_bug_7253(self):
        # fix_tuple_params was being bad and orphaning nodes in the tree.
        b = "def x(arg): reduce(sum, [])"
        a = "from functools import reduce\ndef x(arg): reduce(sum, [])"
        self.check(b, a)

    def test_call_with_lambda(self):
        b = "reduce(lambda x, y: x + y, seq)"
        a = "from functools import reduce\nreduce(lambda x, y: x + y, seq)"
        self.check(b, a)

    def test_unchanged(self):
        s = "reduce(a)"
        self.unchanged(s)

        s = "reduce(a, b=42)"
        self.unchanged(s)

        s = "reduce(a, b, c, d)"
        self.unchanged(s)

        s = "reduce(**c)"
        self.unchanged(s)

        s = "reduce()"
        self.unchanged(s)

class Test_print(FixerTestCase):
    fixer = "print"

    def test_prefix_preservation(self):
        b = """print 1,   1+1,   1+1+1"""
        a = """print(1,   1+1,   1+1+1)"""
        self.check(b, a)

    def test_idempotency(self):
        s = """print()"""
        self.unchanged(s)

        s = """print('')"""
        self.unchanged(s)

    def test_idempotency_print_as_function(self):
        self.refactor.driver.grammar = pygram.python_grammar_no_print_statement
        s = """print(1, 1+1, 1+1+1)"""
        self.unchanged(s)

        s = """print()"""
        self.unchanged(s)

        s = """print('')"""
        self.unchanged(s)

    def test_1(self):
        b = """print 1, 1+1, 1+1+1"""
        a = """print(1, 1+1, 1+1+1)"""
        self.check(b, a)

    def test_2(self):
        b = """print 1, 2"""
        a = """print(1, 2)"""
        self.check(b, a)

    def test_3(self):
        b = """print"""
        a = """print()"""
        self.check(b, a)

    def test_4(self):
        # from bug 3000
        b = """print whatever; print"""
        a = """print(whatever); print()"""
        self.check(b, a)

    def test_5(self):
        b = """print; print whatever;"""
        a = """print(); print(whatever);"""
        self.check(b, a)

    def test_tuple(self):
        b = """print (a, b, c)"""
        a = """print((a, b, c))"""
        self.check(b, a)

    # trailing commas

    def test_trailing_comma_1(self):
        b = """print 1, 2, 3,"""
        a = """print(1, 2, 3, end=' ')"""
        self.check(b, a)

    def test_trailing_comma_2(self):
        b = """print 1, 2,"""
        a = """print(1, 2, end=' ')"""
        self.check(b, a)

    def test_trailing_comma_3(self):
        b = """print 1,"""
        a = """print(1, end=' ')"""
        self.check(b, a)

    # >> stuff

    def test_vargs_without_trailing_comma(self):
        b = """print >>sys.stderr, 1, 2, 3"""
        a = """print(1, 2, 3, file=sys.stderr)"""
        self.check(b, a)

    def test_with_trailing_comma(self):
        b = """print >>sys.stderr, 1, 2,"""
        a = """print(1, 2, end=' ', file=sys.stderr)"""
        self.check(b, a)

    def test_no_trailing_comma(self):
        b = """print >>sys.stderr, 1+1"""
        a = """print(1+1, file=sys.stderr)"""
        self.check(b, a)

    def test_spaces_before_file(self):
        b = """print >>  sys.stderr"""
        a = """print(file=sys.stderr)"""
        self.check(b, a)

    def test_with_future_print_function(self):
        s = "from __future__ import print_function\n" \
            "print('Hai!', end=' ')"
        self.unchanged(s)

        b = "print 'Hello, world!'"
        a = "print('Hello, world!')"
        self.check(b, a)


class Test_exec(FixerTestCase):
    fixer = "exec"

    def test_prefix_preservation(self):
        b = """  exec code in ns1,   ns2"""
        a = """  exec(code, ns1,   ns2)"""
        self.check(b, a)

    def test_basic(self):
        b = """exec code"""
        a = """exec(code)"""
        self.check(b, a)

    def test_with_globals(self):
        b = """exec code in ns"""
        a = """exec(code, ns)"""
        self.check(b, a)

    def test_with_globals_locals(self):
        b = """exec code in ns1, ns2"""
        a = """exec(code, ns1, ns2)"""
        self.check(b, a)

    def test_complex_1(self):
        b = """exec (a.b()) in ns"""
        a = """exec((a.b()), ns)"""
        self.check(b, a)

    def test_complex_2(self):
        b = """exec a.b() + c in ns"""
        a = """exec(a.b() + c, ns)"""
        self.check(b, a)

    # These should not be touched

    def test_unchanged_1(self):
        s = """exec(code)"""
        self.unchanged(s)

    def test_unchanged_2(self):
        s = """exec (code)"""
        self.unchanged(s)

    def test_unchanged_3(self):
        s = """exec(code, ns)"""
        self.unchanged(s)

    def test_unchanged_4(self):
        s = """exec(code, ns1, ns2)"""
        self.unchanged(s)

class Test_repr(FixerTestCase):
    fixer = "repr"

    def test_prefix_preservation(self):
        b = """x =   `1 + 2`"""
        a = """x =   repr(1 + 2)"""
        self.check(b, a)

    def test_simple_1(self):
        b = """x = `1 + 2`"""
        a = """x = repr(1 + 2)"""
        self.check(b, a)

    def test_simple_2(self):
        b = """y = `x`"""
        a = """y = repr(x)"""
        self.check(b, a)

    def test_complex(self):
        b = """z = `y`.__repr__()"""
        a = """z = repr(y).__repr__()"""
        self.check(b, a)

    def test_tuple(self):
        b = """x = `1, 2, 3`"""
        a = """x = repr((1, 2, 3))"""
        self.check(b, a)

    def test_nested(self):
        b = """x = `1 + `2``"""
        a = """x = repr(1 + repr(2))"""
        self.check(b, a)

    def test_nested_tuples(self):
        b = """x = `1, 2 + `3, 4``"""
        a = """x = repr((1, 2 + repr((3, 4))))"""
        self.check(b, a)

class Test_except(FixerTestCase):
    fixer = "except"

    def test_prefix_preservation(self):
        b = """
            try:
                pass
            except (RuntimeError, ImportError),    e:
                pass"""
        a = """
            try:
                pass
            except (RuntimeError, ImportError) as    e:
                pass"""
        self.check(b, a)

    def test_simple(self):
        b = """
            try:
                pass
            except Foo, e:
                pass"""
        a = """
            try:
                pass
            except Foo as e:
                pass"""
        self.check(b, a)

    def test_simple_no_space_before_target(self):
        b = """
            try:
                pass
            except Foo,e:
                pass"""
        a = """
            try:
                pass
            except Foo as e:
                pass"""
        self.check(b, a)

    def test_tuple_unpack(self):
        b = """
            def foo():
                try:
                    pass
                except Exception, (f, e):
                    pass
                except ImportError, e:
                    pass"""

        a = """
            def foo():
                try:
                    pass
                except Exception as xxx_todo_changeme:
                    (f, e) = xxx_todo_changeme.args
                    pass
                except ImportError as e:
                    pass"""
        self.check(b, a)

    def test_multi_class(self):
        b = """
            try:
                pass
            except (RuntimeError, ImportError), e:
                pass"""

        a = """
            try:
                pass
            except (RuntimeError, ImportError) as e:
                pass"""
        self.check(b, a)

    def test_list_unpack(self):
        b = """
            try:
                pass
            except Exception, [a, b]:
                pass"""

        a = """
            try:
                pass
            except Exception as xxx_todo_changeme:
                [a, b] = xxx_todo_changeme.args
                pass"""
        self.check(b, a)

    def test_weird_target_1(self):
        b = """
            try:
                pass
            except Exception, d[5]:
                pass"""

        a = """
            try:
                pass
            except Exception as xxx_todo_changeme:
                d[5] = xxx_todo_changeme
                pass"""
        self.check(b, a)

    def test_weird_target_2(self):
        b = """
            try:
                pass
            except Exception, a.foo:
                pass"""

        a = """
            try:
                pass
            except Exception as xxx_todo_changeme:
                a.foo = xxx_todo_changeme
                pass"""
        self.check(b, a)

    def test_weird_target_3(self):
        b = """
            try:
                pass
            except Exception, a().foo:
                pass"""

        a = """
            try:
                pass
            except Exception as xxx_todo_changeme:
                a().foo = xxx_todo_changeme
                pass"""
        self.check(b, a)

    def test_bare_except(self):
        b = """
            try:
                pass
            except Exception, a:
                pass
            except:
                pass"""

        a = """
            try:
                pass
            except Exception as a:
                pass
            except:
                pass"""
        self.check(b, a)

    def test_bare_except_and_else_finally(self):
        b = """
            try:
                pass
            except Exception, a:
                pass
            except:
                pass
            else:
                pass
            finally:
                pass"""

        a = """
            try:
                pass
            except Exception as a:
                pass
            except:
                pass
            else:
                pass
            finally:
                pass"""
        self.check(b, a)

    def test_multi_fixed_excepts_before_bare_except(self):
        b = """
            try:
                pass
            except TypeError, b:
                pass
            except Exception, a:
                pass
            except:
                pass"""

        a = """
            try:
                pass
            except TypeError as b:
                pass
            except Exception as a:
                pass
            except:
                pass"""
        self.check(b, a)

    def test_one_line_suites(self):
        b = """
            try: raise TypeError
            except TypeError, e:
                pass
            """
        a = """
            try: raise TypeError
            except TypeError as e:
                pass
            """
        self.check(b, a)
        b = """
            try:
                raise TypeError
            except TypeError, e: pass
            """
        a = """
            try:
                raise TypeError
            except TypeError as e: pass
            """
        self.check(b, a)
        b = """
            try: raise TypeError
            except TypeError, e: pass
            """
        a = """
            try: raise TypeError
            except TypeError as e: pass
            """
        self.check(b, a)
        b = """
            try: raise TypeError
            except TypeError, e: pass
            else: function()
            finally: done()
            """
        a = """
            try: raise TypeError
            except TypeError as e: pass
            else: function()
            finally: done()
            """
        self.check(b, a)

    # These should not be touched:

    def test_unchanged_1(self):
        s = """
            try:
                pass
            except:
                pass"""
        self.unchanged(s)

    def test_unchanged_2(self):
        s = """
            try:
                pass
            except Exception:
                pass"""
        self.unchanged(s)

    def test_unchanged_3(self):
        s = """
            try:
                pass
            except (Exception, SystemExit):
                pass"""
        self.unchanged(s)

class Test_raise(FixerTestCase):
    fixer = "raise"

    def test_basic(self):
        b = """raise Exception, 5"""
        a = """raise Exception(5)"""
        self.check(b, a)

    def test_prefix_preservation(self):
        b = """raise Exception,5"""
        a = """raise Exception(5)"""
        self.check(b, a)

        b = """raise   Exception,    5"""
        a = """raise   Exception(5)"""
        self.check(b, a)

    def test_with_comments(self):
        b = """raise Exception, 5 # foo"""
        a = """raise Exception(5) # foo"""
        self.check(b, a)

        b = """raise E, (5, 6) % (a, b) # foo"""
        a = """raise E((5, 6) % (a, b)) # foo"""
        self.check(b, a)

        b = """def foo():
                    raise Exception, 5, 6 # foo"""
        a = """def foo():
                    raise Exception(5).with_traceback(6) # foo"""
        self.check(b, a)

    def test_None_value(self):
        b = """raise Exception(5), None, tb"""
        a = """raise Exception(5).with_traceback(tb)"""
        self.check(b, a)

    def test_tuple_value(self):
        b = """raise Exception, (5, 6, 7)"""
        a = """raise Exception(5, 6, 7)"""
        self.check(b, a)

    def test_tuple_detection(self):
        b = """raise E, (5, 6) % (a, b)"""
        a = """raise E((5, 6) % (a, b))"""
        self.check(b, a)

    def test_tuple_exc_1(self):
        b = """raise (((E1, E2), E3), E4), V"""
        a = """raise E1(V)"""
        self.check(b, a)

    def test_tuple_exc_2(self):
        b = """raise (E1, (E2, E3), E4), V"""
        a = """raise E1(V)"""
        self.check(b, a)

    # These should produce a warning

    def test_string_exc(self):
        s = """raise 'foo'"""
        self.warns_unchanged(s, "Python 3 does not support string exceptions")

    def test_string_exc_val(self):
        s = """raise "foo", 5"""
        self.warns_unchanged(s, "Python 3 does not support string exceptions")

    def test_string_exc_val_tb(self):
        s = """raise "foo", 5, 6"""
        self.warns_unchanged(s, "Python 3 does not support string exceptions")

    # These should result in traceback-assignment

    def test_tb_1(self):
        b = """def foo():
                    raise Exception, 5, 6"""
        a = """def foo():
                    raise Exception(5).with_traceback(6)"""
        self.check(b, a)

    def test_tb_2(self):
        b = """def foo():
                    a = 5
                    raise Exception, 5, 6
                    b = 6"""
        a = """def foo():
                    a = 5
                    raise Exception(5).with_traceback(6)
                    b = 6"""
        self.check(b, a)

    def test_tb_3(self):
        b = """def foo():
                    raise Exception,5,6"""
        a = """def foo():
                    raise Exception(5).with_traceback(6)"""
        self.check(b, a)

    def test_tb_4(self):
        b = """def foo():
                    a = 5
                    raise Exception,5,6
                    b = 6"""
        a = """def foo():
                    a = 5
                    raise Exception(5).with_traceback(6)
                    b = 6"""
        self.check(b, a)

    def test_tb_5(self):
        b = """def foo():
                    raise Exception, (5, 6, 7), 6"""
        a = """def foo():
                    raise Exception(5, 6, 7).with_traceback(6)"""
        self.check(b, a)

    def test_tb_6(self):
        b = """def foo():
                    a = 5
                    raise Exception, (5, 6, 7), 6
                    b = 6"""
        a = """def foo():
                    a = 5
                    raise Exception(5, 6, 7).with_traceback(6)
                    b = 6"""
        self.check(b, a)

class Test_throw(FixerTestCase):
    fixer = "throw"

    def test_1(self):
        b = """g.throw(Exception, 5)"""
        a = """g.throw(Exception(5))"""
        self.check(b, a)

    def test_2(self):
        b = """g.throw(Exception,5)"""
        a = """g.throw(Exception(5))"""
        self.check(b, a)

    def test_3(self):
        b = """g.throw(Exception, (5, 6, 7))"""
        a = """g.throw(Exception(5, 6, 7))"""
        self.check(b, a)

    def test_4(self):
        b = """5 + g.throw(Exception, 5)"""
        a = """5 + g.throw(Exception(5))"""
        self.check(b, a)

    # These should produce warnings

    def test_warn_1(self):
        s = """g.throw("foo")"""
        self.warns_unchanged(s, "Python 3 does not support string exceptions")

    def test_warn_2(self):
        s = """g.throw("foo", 5)"""
        self.warns_unchanged(s, "Python 3 does not support string exceptions")

    def test_warn_3(self):
        s = """g.throw("foo", 5, 6)"""
        self.warns_unchanged(s, "Python 3 does not support string exceptions")

    # These should not be touched

    def test_untouched_1(self):
        s = """g.throw(Exception)"""
        self.unchanged(s)

    def test_untouched_2(self):
        s = """g.throw(Exception(5, 6))"""
        self.unchanged(s)

    def test_untouched_3(self):
        s = """5 + g.throw(Exception(5, 6))"""
        self.unchanged(s)

    # These should result in traceback-assignment

    def test_tb_1(self):
        b = """def foo():
                    g.throw(Exception, 5, 6)"""
        a = """def foo():
                    g.throw(Exception(5).with_traceback(6))"""
        self.check(b, a)

    def test_tb_2(self):
        b = """def foo():
                    a = 5
                    g.throw(Exception, 5, 6)
                    b = 6"""
        a = """def foo():
                    a = 5
                    g.throw(Exception(5).with_traceback(6))
                    b = 6"""
        self.check(b, a)

    def test_tb_3(self):
        b = """def foo():
                    g.throw(Exception,5,6)"""
        a = """def foo():
                    g.throw(Exception(5).with_traceback(6))"""
        self.check(b, a)

    def test_tb_4(self):
        b = """def foo():
                    a = 5
                    g.throw(Exception,5,6)
                    b = 6"""
        a = """def foo():
                    a = 5
                    g.throw(Exception(5).with_traceback(6))
                    b = 6"""
        self.check(b, a)

    def test_tb_5(self):
        b = """def foo():
                    g.throw(Exception, (5, 6, 7), 6)"""
        a = """def foo():
                    g.throw(Exception(5, 6, 7).with_traceback(6))"""
        self.check(b, a)

    def test_tb_6(self):
        b = """def foo():
                    a = 5
                    g.throw(Exception, (5, 6, 7), 6)
                    b = 6"""
        a = """def foo():
                    a = 5
                    g.throw(Exception(5, 6, 7).with_traceback(6))
                    b = 6"""
        self.check(b, a)

    def test_tb_7(self):
        b = """def foo():
                    a + g.throw(Exception, 5, 6)"""
        a = """def foo():
                    a + g.throw(Exception(5).with_traceback(6))"""
        self.check(b, a)

    def test_tb_8(self):
        b = """def foo():
                    a = 5
                    a + g.throw(Exception, 5, 6)
                    b = 6"""
        a = """def foo():
                    a = 5
                    a + g.throw(Exception(5).with_traceback(6))
                    b = 6"""
        self.check(b, a)

class Test_long(FixerTestCase):
    fixer = "long"

    def test_1(self):
        b = """x = long(x)"""
        a = """x = int(x)"""
        self.check(b, a)

    def test_2(self):
        b = """y = isinstance(x, long)"""
        a = """y = isinstance(x, int)"""
        self.check(b, a)

    def test_3(self):
        b = """z = type(x) in (int, long)"""
        a = """z = type(x) in (int, int)"""
        self.check(b, a)

    def test_unchanged(self):
        s = """long = True"""
        self.unchanged(s)

        s = """s.long = True"""
        self.unchanged(s)

        s = """def long(): pass"""
        self.unchanged(s)

        s = """class long(): pass"""
        self.unchanged(s)

        s = """def f(long): pass"""
        self.unchanged(s)

        s = """def f(g, long): pass"""
        self.unchanged(s)

        s = """def f(x, long=True): pass"""
        self.unchanged(s)

    def test_prefix_preservation(self):
        b = """x =   long(  x  )"""
        a = """x =   int(  x  )"""
        self.check(b, a)


class Test_execfile(FixerTestCase):
    fixer = "execfile"

    def test_conversion(self):
        b = """execfile("fn")"""
        a = """exec(compile(open("fn").read(), "fn", 'exec'))"""
        self.check(b, a)

        b = """execfile("fn", glob)"""
        a = """exec(compile(open("fn").read(), "fn", 'exec'), glob)"""
        self.check(b, a)

        b = """execfile("fn", glob, loc)"""
        a = """exec(compile(open("fn").read(), "fn", 'exec'), glob, loc)"""
        self.check(b, a)

        b = """execfile("fn", globals=glob)"""
        a = """exec(compile(open("fn").read(), "fn", 'exec'), globals=glob)"""
        self.check(b, a)

        b = """execfile("fn", locals=loc)"""
        a = """exec(compile(open("fn").read(), "fn", 'exec'), locals=loc)"""
        self.check(b, a)

        b = """execfile("fn", globals=glob, locals=loc)"""
        a = """exec(compile(open("fn").read(), "fn", 'exec'), globals=glob, locals=loc)"""
        self.check(b, a)

    def test_spacing(self):
        b = """execfile( "fn" )"""
        a = """exec(compile(open( "fn" ).read(), "fn", 'exec'))"""
        self.check(b, a)

        b = """execfile("fn",  globals = glob)"""
        a = """exec(compile(open("fn").read(), "fn", 'exec'),  globals = glob)"""
        self.check(b, a)


class Test_isinstance(FixerTestCase):
    fixer = "isinstance"

    def test_remove_multiple_items(self):
        b = """isinstance(x, (int, int, int))"""
        a = """isinstance(x, int)"""
        self.check(b, a)

        b = """isinstance(x, (int, float, int, int, float))"""
        a = """isinstance(x, (int, float))"""
        self.check(b, a)

        b = """isinstance(x, (int, float, int, int, float, str))"""
        a = """isinstance(x, (int, float, str))"""
        self.check(b, a)

        b = """isinstance(foo() + bar(), (x(), y(), x(), int, int))"""
        a = """isinstance(foo() + bar(), (x(), y(), x(), int))"""
        self.check(b, a)

    def test_prefix_preservation(self):
        b = """if    isinstance(  foo(), (  bar, bar, baz )) : pass"""
        a = """if    isinstance(  foo(), (  bar, baz )) : pass"""
        self.check(b, a)

    def test_unchanged(self):
        self.unchanged("isinstance(x, (str, int))")

class Test_dict(FixerTestCase):
    fixer = "dict"

    def test_prefix_preservation(self):
        b = "if   d. keys  (  )  : pass"
        a = "if   list(d. keys  (  ))  : pass"
        self.check(b, a)

        b = "if   d. items  (  )  : pass"
        a = "if   list(d. items  (  ))  : pass"
        self.check(b, a)

        b = "if   d. iterkeys  ( )  : pass"
        a = "if   iter(d. keys  ( ))  : pass"
        self.check(b, a)

        b = "[i for i in    d.  iterkeys(  )  ]"
        a = "[i for i in    d.  keys(  )  ]"
        self.check(b, a)

        b = "if   d. viewkeys  ( )  : pass"
        a = "if   d. keys  ( )  : pass"
        self.check(b, a)

        b = "[i for i in    d.  viewkeys(  )  ]"
        a = "[i for i in    d.  keys(  )  ]"
        self.check(b, a)

    def test_trailing_comment(self):
        b = "d.keys() # foo"
        a = "list(d.keys()) # foo"
        self.check(b, a)

        b = "d.items()  # foo"
        a = "list(d.items())  # foo"
        self.check(b, a)

        b = "d.iterkeys()  # foo"
        a = "iter(d.keys())  # foo"
        self.check(b, a)

        b = """[i for i in d.iterkeys() # foo
               ]"""
        a = """[i for i in d.keys() # foo
               ]"""
        self.check(b, a)

        b = """[i for i in d.iterkeys() # foo
               ]"""
        a = """[i for i in d.keys() # foo
               ]"""
        self.check(b, a)

        b = "d.viewitems()  # foo"
        a = "d.items()  # foo"
        self.check(b, a)

    def test_unchanged(self):
        for wrapper in fixer_util.consuming_calls:
            s = "s = %s(d.keys())" % wrapper
            self.unchanged(s)

            s = "s = %s(d.values())" % wrapper
            self.unchanged(s)

            s = "s = %s(d.items())" % wrapper
            self.unchanged(s)

    def test_01(self):
        b = "d.keys()"
        a = "list(d.keys())"
        self.check(b, a)

        b = "a[0].foo().keys()"
        a = "list(a[0].foo().keys())"
        self.check(b, a)

    def test_02(self):
        b = "d.items()"
        a = "list(d.items())"
        self.check(b, a)

    def test_03(self):
        b = "d.values()"
        a = "list(d.values())"
        self.check(b, a)

    def test_04(self):
        b = "d.iterkeys()"
        a = "iter(d.keys())"
        self.check(b, a)

    def test_05(self):
        b = "d.iteritems()"
        a = "iter(d.items())"
        self.check(b, a)

    def test_06(self):
        b = "d.itervalues()"
        a = "iter(d.values())"
        self.check(b, a)

    def test_07(self):
        s = "list(d.keys())"
        self.unchanged(s)

    def test_08(self):
        s = "sorted(d.keys())"
        self.unchanged(s)

    def test_09(self):
        b = "iter(d.keys())"
        a = "iter(list(d.keys()))"
        self.check(b, a)

    def test_10(self):
        b = "foo(d.keys())"
        a = "foo(list(d.keys()))"
        self.check(b, a)

    def test_11(self):
        b = "for i in d.keys(): print i"
        a = "for i in list(d.keys()): print i"
        self.check(b, a)

    def test_12(self):
        b = "for i in d.iterkeys(): print i"
        a = "for i in d.keys(): print i"
        self.check(b, a)

    def test_13(self):
        b = "[i for i in d.keys()]"
        a = "[i for i in list(d.keys())]"
        self.check(b, a)

    def test_14(self):
        b = "[i for i in d.iterkeys()]"
        a = "[i for i in d.keys()]"
        self.check(b, a)

    def test_15(self):
        b = "(i for i in d.keys())"
        a = "(i for i in list(d.keys()))"
        self.check(b, a)

    def test_16(self):
        b = "(i for i in d.iterkeys())"
        a = "(i for i in d.keys())"
        self.check(b, a)

    def test_17(self):
        b = "iter(d.iterkeys())"
        a = "iter(d.keys())"
        self.check(b, a)

    def test_18(self):
        b = "list(d.iterkeys())"
        a = "list(d.keys())"
        self.check(b, a)

    def test_19(self):
        b = "sorted(d.iterkeys())"
        a = "sorted(d.keys())"
        self.check(b, a)

    def test_20(self):
        b = "foo(d.iterkeys())"
        a = "foo(iter(d.keys()))"
        self.check(b, a)

    def test_21(self):
        b = "print h.iterkeys().next()"
        a = "print iter(h.keys()).next()"
        self.check(b, a)

    def test_22(self):
        b = "print h.keys()[0]"
        a = "print list(h.keys())[0]"
        self.check(b, a)

    def test_23(self):
        b = "print list(h.iterkeys().next())"
        a = "print list(iter(h.keys()).next())"
        self.check(b, a)

    def test_24(self):
        b = "for x in h.keys()[0]: print x"
        a = "for x in list(h.keys())[0]: print x"
        self.check(b, a)

    def test_25(self):
        b = "d.viewkeys()"
        a = "d.keys()"
        self.check(b, a)

    def test_26(self):
        b = "d.viewitems()"
        a = "d.items()"
        self.check(b, a)

    def test_27(self):
        b = "d.viewvalues()"
        a = "d.values()"
        self.check(b, a)

    def test_28(self):
        b = "[i for i in d.viewkeys()]"
        a = "[i for i in d.keys()]"
        self.check(b, a)

    def test_29(self):
        b = "(i for i in d.viewkeys())"
        a = "(i for i in d.keys())"
        self.check(b, a)

    def test_30(self):
        b = "iter(d.viewkeys())"
        a = "iter(d.keys())"
        self.check(b, a)

    def test_31(self):
        b = "list(d.viewkeys())"
        a = "list(d.keys())"
        self.check(b, a)

    def test_32(self):
        b = "sorted(d.viewkeys())"
        a = "sorted(d.keys())"
        self.check(b, a)

class Test_xrange(FixerTestCase):
    fixer = "xrange"

    def test_prefix_preservation(self):
        b = """x =    xrange(  10  )"""
        a = """x =    range(  10  )"""
        self.check(b, a)

        b = """x = xrange(  1  ,  10   )"""
        a = """x = range(  1  ,  10   )"""
        self.check(b, a)

        b = """x = xrange(  0  ,  10 ,  2 )"""
        a = """x = range(  0  ,  10 ,  2 )"""
        self.check(b, a)

    def test_single_arg(self):
        b = """x = xrange(10)"""
        a = """x = range(10)"""
        self.check(b, a)

    def test_two_args(self):
        b = """x = xrange(1, 10)"""
        a = """x = range(1, 10)"""
        self.check(b, a)

    def test_three_args(self):
        b = """x = xrange(0, 10, 2)"""
        a = """x = range(0, 10, 2)"""
        self.check(b, a)

    def test_wrap_in_list(self):
        b = """x = range(10, 3, 9)"""
        a = """x = list(range(10, 3, 9))"""
        self.check(b, a)

        b = """x = foo(range(10, 3, 9))"""
        a = """x = foo(list(range(10, 3, 9)))"""
        self.check(b, a)

        b = """x = range(10, 3, 9) + [4]"""
        a = """x = list(range(10, 3, 9)) + [4]"""
        self.check(b, a)

        b = """x = range(10)[::-1]"""
        a = """x = list(range(10))[::-1]"""
        self.check(b, a)

        b = """x = range(10)  [3]"""
        a = """x = list(range(10))  [3]"""
        self.check(b, a)

    def test_xrange_in_for(self):
        b = """for i in xrange(10):\n    j=i"""
        a = """for i in range(10):\n    j=i"""
        self.check(b, a)

        b = """[i for i in xrange(10)]"""
        a = """[i for i in range(10)]"""
        self.check(b, a)

    def test_range_in_for(self):
        self.unchanged("for i in range(10): pass")
        self.unchanged("[i for i in range(10)]")

    def test_in_contains_test(self):
        self.unchanged("x in range(10, 3, 9)")

    def test_in_consuming_context(self):
        for call in fixer_util.consuming_calls:
            self.unchanged("a = %s(range(10))" % call)

class Test_xrange_with_reduce(FixerTestCase):

    def setUp(self):
        super(Test_xrange_with_reduce, self).setUp(["xrange", "reduce"])

    def test_double_transform(self):
        b = """reduce(x, xrange(5))"""
        a = """from functools import reduce
reduce(x, range(5))"""
        self.check(b, a)

class Test_raw_input(FixerTestCase):
    fixer = "raw_input"

    def test_prefix_preservation(self):
        b = """x =    raw_input(   )"""
        a = """x =    input(   )"""
        self.check(b, a)

        b = """x = raw_input(   ''   )"""
        a = """x = input(   ''   )"""
        self.check(b, a)

    def test_1(self):
        b = """x = raw_input()"""
        a = """x = input()"""
        self.check(b, a)

    def test_2(self):
        b = """x = raw_input('')"""
        a = """x = input('')"""
        self.check(b, a)

    def test_3(self):
        b = """x = raw_input('prompt')"""
        a = """x = input('prompt')"""
        self.check(b, a)

    def test_4(self):
        b = """x = raw_input(foo(a) + 6)"""
        a = """x = input(foo(a) + 6)"""
        self.check(b, a)

    def test_5(self):
        b = """x = raw_input(invite).split()"""
        a = """x = input(invite).split()"""
        self.check(b, a)

    def test_6(self):
        b = """x = raw_input(invite) . split ()"""
        a = """x = input(invite) . split ()"""
        self.check(b, a)

    def test_8(self):
        b = "x = int(raw_input())"
        a = "x = int(input())"
        self.check(b, a)

class Test_funcattrs(FixerTestCase):
    fixer = "funcattrs"

    attrs = ["closure", "doc", "name", "defaults", "code", "globals", "dict"]

    def test(self):
        for attr in self.attrs:
            b = "a.func_%s" % attr
            a = "a.__%s__" % attr
            self.check(b, a)

            b = "self.foo.func_%s.foo_bar" % attr
            a = "self.foo.__%s__.foo_bar" % attr
            self.check(b, a)

    def test_unchanged(self):
        for attr in self.attrs:
            s = "foo(func_%s + 5)" % attr
            self.unchanged(s)

            s = "f(foo.__%s__)" % attr
            self.unchanged(s)

            s = "f(foo.__%s__.foo)" % attr
            self.unchanged(s)

class Test_xreadlines(FixerTestCase):
    fixer = "xreadlines"

    def test_call(self):
        b = "for x in f.xreadlines(): pass"
        a = "for x in f: pass"
        self.check(b, a)

        b = "for x in foo().xreadlines(): pass"
        a = "for x in foo(): pass"
        self.check(b, a)

        b = "for x in (5 + foo()).xreadlines(): pass"
        a = "for x in (5 + foo()): pass"
        self.check(b, a)

    def test_attr_ref(self):
        b = "foo(f.xreadlines + 5)"
        a = "foo(f.__iter__ + 5)"
        self.check(b, a)

        b = "foo(f().xreadlines + 5)"
        a = "foo(f().__iter__ + 5)"
        self.check(b, a)

        b = "foo((5 + f()).xreadlines + 5)"
        a = "foo((5 + f()).__iter__ + 5)"
        self.check(b, a)

    def test_unchanged(self):
        s = "for x in f.xreadlines(5): pass"
        self.unchanged(s)

        s = "for x in f.xreadlines(k=5): pass"
        self.unchanged(s)

        s = "for x in f.xreadlines(*k, **v): pass"
        self.unchanged(s)

        s = "foo(xreadlines)"
        self.unchanged(s)


class ImportsFixerTests:

    def test_import_module(self):
        for old, new in self.modules.items():
            b = "import %s" % old
            a = "import %s" % new
            self.check(b, a)

            b = "import foo, %s, bar" % old
            a = "import foo, %s, bar" % new
            self.check(b, a)

    def test_import_from(self):
        for old, new in self.modules.items():
            b = "from %s import foo" % old
            a = "from %s import foo" % new
            self.check(b, a)

            b = "from %s import foo, bar" % old
            a = "from %s import foo, bar" % new
            self.check(b, a)

            b = "from %s import (yes, no)" % old
            a = "from %s import (yes, no)" % new
            self.check(b, a)

    def test_import_module_as(self):
        for old, new in self.modules.items():
            b = "import %s as foo_bar" % old
            a = "import %s as foo_bar" % new
            self.check(b, a)

            b = "import %s as foo_bar" % old
            a = "import %s as foo_bar" % new
            self.check(b, a)

    def test_import_from_as(self):
        for old, new in self.modules.items():
            b = "from %s import foo as bar" % old
            a = "from %s import foo as bar" % new
            self.check(b, a)

    def test_star(self):
        for old, new in self.modules.items():
            b = "from %s import *" % old
            a = "from %s import *" % new
            self.check(b, a)

    def test_import_module_usage(self):
        for old, new in self.modules.items():
            b = """
                import %s
                foo(%s.bar)
                """ % (old, old)
            a = """
                import %s
                foo(%s.bar)
                """ % (new, new)
            self.check(b, a)

            b = """
                from %s import x
                %s = 23
                """ % (old, old)
            a = """
                from %s import x
                %s = 23
                """ % (new, old)
            self.check(b, a)

            s = """
                def f():
                    %s.method()
                """ % (old,)
            self.unchanged(s)

            # test nested usage
            b = """
                import %s
                %s.bar(%s.foo)
                """ % (old, old, old)
            a = """
                import %s
                %s.bar(%s.foo)
                """ % (new, new, new)
            self.check(b, a)

            b = """
                import %s
                x.%s
                """ % (old, old)
            a = """
                import %s
                x.%s
                """ % (new, old)
            self.check(b, a)


class Test_imports(FixerTestCase, ImportsFixerTests):
    fixer = "imports"
    from ..fixes.fix_imports import MAPPING as modules

    def test_multiple_imports(self):
        b = """import urlparse, cStringIO"""
        a = """import urllib.parse, io"""
        self.check(b, a)

    def test_multiple_imports_as(self):
        b = """
            import copy_reg as bar, HTMLParser as foo, urlparse
            s = urlparse.spam(bar.foo())
            """
        a = """
            import copyreg as bar, html.parser as foo, urllib.parse
            s = urllib.parse.spam(bar.foo())
            """
        self.check(b, a)


class Test_imports2(FixerTestCase, ImportsFixerTests):
    fixer = "imports2"
    from ..fixes.fix_imports2 import MAPPING as modules


class Test_imports_fixer_order(FixerTestCase, ImportsFixerTests):

    def setUp(self):
        super(Test_imports_fixer_order, self).setUp(['imports', 'imports2'])
        from ..fixes.fix_imports2 import MAPPING as mapping2
        self.modules = mapping2.copy()
        from ..fixes.fix_imports import MAPPING as mapping1
        for key in ('dbhash', 'dumbdbm', 'dbm', 'gdbm'):
            self.modules[key] = mapping1[key]

    def test_after_local_imports_refactoring(self):
        for fix in ("imports", "imports2"):
            self.fixer = fix
            self.assert_runs_after("import")


class Test_urllib(FixerTestCase):
    fixer = "urllib"
    from ..fixes.fix_urllib import MAPPING as modules

    def test_import_module(self):
        for old, changes in self.modules.items():
            b = "import %s" % old
            a = "import %s" % ", ".join(map(itemgetter(0), changes))
            self.check(b, a)

    def test_import_from(self):
        for old, changes in self.modules.items():
            all_members = []
            for new, members in changes:
                for member in members:
                    all_members.append(member)
                    b = "from %s import %s" % (old, member)
                    a = "from %s import %s" % (new, member)
                    self.check(b, a)

                    s = "from foo import %s" % member
                    self.unchanged(s)

                b = "from %s import %s" % (old, ", ".join(members))
                a = "from %s import %s" % (new, ", ".join(members))
                self.check(b, a)

                s = "from foo import %s" % ", ".join(members)
                self.unchanged(s)

            # test the breaking of a module into multiple replacements
            b = "from %s import %s" % (old, ", ".join(all_members))
            a = "\n".join(["from %s import %s" % (new, ", ".join(members))
                            for (new, members) in changes])
            self.check(b, a)

    def test_import_module_as(self):
        for old in self.modules:
            s = "import %s as foo" % old
            self.warns_unchanged(s, "This module is now multiple modules")

    def test_import_from_as(self):
        for old, changes in self.modules.items():
            for new, members in changes:
                for member in members:
                    b = "from %s import %s as foo_bar" % (old, member)
                    a = "from %s import %s as foo_bar" % (new, member)
                    self.check(b, a)
                    b = "from %s import %s as blah, %s" % (old, member, member)
                    a = "from %s import %s as blah, %s" % (new, member, member)
                    self.check(b, a)

    def test_star(self):
        for old in self.modules:
            s = "from %s import *" % old
            self.warns_unchanged(s, "Cannot handle star imports")

    def test_indented(self):
        b = """
def foo():
    from urllib import urlencode, urlopen
"""
        a = """
def foo():
    from urllib.parse import urlencode
    from urllib.request import urlopen
"""
        self.check(b, a)

        b = """
def foo():
    other()
    from urllib import urlencode, urlopen
"""
        a = """
def foo():
    other()
    from urllib.parse import urlencode
    from urllib.request import urlopen
"""
        self.check(b, a)



    def test_import_module_usage(self):
        for old, changes in self.modules.items():
            for new, members in changes:
                for member in members:
                    new_import = ", ".join([n for (n, mems)
                                            in self.modules[old]])
                    b = """
                        import %s
                        foo(%s.%s)
                        """ % (old, old, member)
                    a = """
     …