Adds test for pprint type without meta

IPython/lib/tests/test_pretty.py

@@ -1,232 +1,256 b''
 """Tests for IPython.lib.pretty."""
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 from __future__ import print_function
 
 # Third-party imports
 import nose.tools as nt
 
 # Our own imports
 from IPython.lib import pretty
 from IPython.testing.decorators import skip_without
+from IPython.utils.py3compat import PY3
+
+if PY3:
+    from io import StringIO
+else:
+    from StringIO import StringIO
 
 
 class MyList(object):
     def __init__(self, content):
         self.content = content
     def _repr_pretty_(self, p, cycle):
         if cycle:
             p.text("MyList(...)")
         else:
             with p.group(3, "MyList(", ")"):
                 for (i, child) in enumerate(self.content):
                     if i:
                         p.text(",")
                         p.breakable()
                     else:
                         p.breakable("")
                     p.pretty(child)
 
 
 class MyDict(dict):
     def _repr_pretty_(self, p, cycle):
         p.text("MyDict(...)")
 
 class MyObj(object):
     def somemethod(self):
         pass
 
 
 class Dummy1(object):
     def _repr_pretty_(self, p, cycle):
         p.text("Dummy1(...)")
 
 class Dummy2(Dummy1):
     _repr_pretty_ = None
 
 class NoModule(object):
     pass
 
 NoModule.__module__ = None
 
 class Breaking(object):
     def _repr_pretty_(self, p, cycle):
         with p.group(4,"TG: ",":"):
             p.text("Breaking(")
             p.break_()
             p.text(")")
 
 class BreakingRepr(object):
     def __repr__(self):
         return "Breaking(\n)"
 
 class BreakingReprParent(object):
     def _repr_pretty_(self, p, cycle):
         with p.group(4,"TG: ",":"):
             p.pretty(BreakingRepr())
 
 class BadRepr(object):
     
     def __repr__(self):
         return 1/0
 
 
 def test_indentation():
     """Test correct indentation in groups"""
     count = 40
     gotoutput = pretty.pretty(MyList(range(count)))
     expectedoutput = "MyList(\n" + ",\n".join("   %d" % i for i in range(count)) + ")"
 
     nt.assert_equal(gotoutput, expectedoutput)
 
 
 def test_dispatch():
     """
     Test correct dispatching: The _repr_pretty_ method for MyDict
     must be found before the registered printer for dict.
     """
     gotoutput = pretty.pretty(MyDict())
     expectedoutput = "MyDict(...)"
 
     nt.assert_equal(gotoutput, expectedoutput)
 
 
 def test_callability_checking():
     """
     Test that the _repr_pretty_ method is tested for callability and skipped if
     not.
     """
     gotoutput = pretty.pretty(Dummy2())
     expectedoutput = "Dummy1(...)"
 
     nt.assert_equal(gotoutput, expectedoutput)
 
 
 def test_sets():
     """
     Test that set and frozenset use Python 3 formatting.
     """
     objects = [set(), frozenset(), set([1]), frozenset([1]), set([1, 2]),
         frozenset([1, 2]), set([-1, -2, -3])]
     expected = ['set()', 'frozenset()', '{1}', 'frozenset({1})', '{1, 2}',
         'frozenset({1, 2})', '{-3, -2, -1}']
     for obj, expected_output in zip(objects, expected):
         got_output = pretty.pretty(obj)
         yield nt.assert_equal, got_output, expected_output
 
 
 @skip_without('xxlimited')
 def test_pprint_heap_allocated_type():
     """
     Test that pprint works for heap allocated types.
     """
     import xxlimited
     output = pretty.pretty(xxlimited.Null)
     nt.assert_equal(output, 'xxlimited.Null')
 
 def test_pprint_nomod():
     """
     Test that pprint works for classes with no __module__.
     """
     output = pretty.pretty(NoModule)
     nt.assert_equal(output, 'NoModule')
     
 def test_pprint_break():
     """
     Test that p.break_ produces expected output
     """
     output = pretty.pretty(Breaking())
     expected = "TG: Breaking(\n    ):"
     nt.assert_equal(output, expected)
 
 def test_pprint_break_repr():
     """
     Test that p.break_ is used in repr
     """
     output = pretty.pretty(BreakingReprParent())
     expected = "TG: Breaking(\n    ):"
     nt.assert_equal(output, expected)
 
 def test_bad_repr():
     """Don't catch bad repr errors"""
     with nt.assert_raises(ZeroDivisionError):
         output = pretty.pretty(BadRepr())
 
 class BadException(Exception):
     def __str__(self):
         return -1
 
 class ReallyBadRepr(object):
     __module__ = 1
     @property
     def __class__(self):
         raise ValueError("I am horrible")
     
     def __repr__(self):
         raise BadException()
 
 def test_really_bad_repr():
     with nt.assert_raises(BadException):
         output = pretty.pretty(ReallyBadRepr())
 
 
 class SA(object):
     pass
 
 class SB(SA):
     pass
 
 def test_super_repr():
     output = pretty.pretty(super(SA))
     nt.assert_in("SA", output)
 
     sb = SB()
     output = pretty.pretty(super(SA, sb))
     nt.assert_in("SA", output)
 
 
 def test_long_list():
     lis = list(range(10000))
     p = pretty.pretty(lis)
     last2 = p.rsplit('\n', 2)[-2:]
     nt.assert_equal(last2, [' 999,', ' ...]'])
 
 def test_long_set():
     s = set(range(10000))
     p = pretty.pretty(s)
     last2 = p.rsplit('\n', 2)[-2:]
     nt.assert_equal(last2, [' 999,', ' ...}'])
 
 def test_long_tuple():
     tup = tuple(range(10000))
     p = pretty.pretty(tup)
     last2 = p.rsplit('\n', 2)[-2:]
     nt.assert_equal(last2, [' 999,', ' ...)'])
 
 def test_long_dict():
     d = { n:n for n in range(10000) }
     p = pretty.pretty(d)
     last2 = p.rsplit('\n', 2)[-2:]
     nt.assert_equal(last2, [' 999: 999,', ' ...}'])
 
 def test_unbound_method():
     output = pretty.pretty(MyObj.somemethod)
     nt.assert_in('MyObj.somemethod', output)
 
 
 class MetaClass(type):
     def __new__(cls, name):
         return type.__new__(cls, name, (object,), {'name': name})
 
     def __repr__(self):
         return "[CUSTOM REPR FOR CLASS %s]" % self.name
 
 
 ClassWithMeta = MetaClass('ClassWithMeta')
 
 
 def test_metaclass_repr():
     output = pretty.pretty(ClassWithMeta)
     nt.assert_equal(output, "[CUSTOM REPR FOR CLASS ClassWithMeta]")
+
+
+def test_basic_class():
+    def type_pprint_wrapper(obj, p, cycle):
+        if obj is MyObj:
+            type_pprint_wrapper.called = True
+        return pretty._type_pprint(obj, p, cycle)
+    type_pprint_wrapper.called = False
+
+    stream = StringIO()
+    printer = pretty.RepresentationPrinter(stream)
+    printer.type_pprinters[type] = type_pprint_wrapper
+    printer.pretty(MyObj)
+    printer.flush()
+    output = stream.getvalue()
+
+    nt.assert_equal(output, '%s.MyObj' % __name__)
+    nt.assert_true(type_pprint_wrapper.called)