ENH: Add tests for set and frozenset pretty-printing.

IPython/lib/tests/test_pretty.py

@@ -1,94 +1,108 b''
 """Tests for IPython.lib.pretty.
 """
 #-----------------------------------------------------------------------------
 # Copyright (c) 2011, the IPython Development Team.
 #
 # Distributed under the terms of the Modified BSD License.
 #
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 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
 
 #-----------------------------------------------------------------------------
 # Classes and functions
 #-----------------------------------------------------------------------------
 
 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 Dummy1(object):
     def _repr_pretty_(self, p, cycle):
         p.text("Dummy1(...)")
 
 class Dummy2(Dummy1):
     _repr_pretty_ = None
 
 
 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])]
+    expected = ['set()', 'frozenset()', '{1}', 'frozenset({1})', '{1, 2}',
+        'frozenset({1, 2})']
+    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')