Python: Add 2/3 specific query tests.

Author: markshannon

python/ql/test/2/query-tests/Classes/equals-hash/EqualsOrHash.expected

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+| equals_hash.py:8:5:8:28 | Function __eq__ | Class $@ implements __eq__ but does not define __hash__. | equals_hash.py:3:1:3:17 | class Eq | Eq |
+| equals_hash.py:24:5:24:23 | Function __hash__ | Class $@ implements __hash__ but does not define __eq__ or __cmp__. | equals_hash.py:19:1:19:19 | class Hash | Hash |

python/ql/test/2/query-tests/Classes/equals-hash/EqualsOrHash.qlref

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+Classes/EqualsOrHash.ql

python/ql/test/2/query-tests/Classes/equals-hash/EqualsOrNotEquals.expected

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+| equals_hash.py:8:5:8:28 | Function __eq__ | Class $@ implements __eq__ but does not implement __ne__. | equals_hash.py:3:1:3:17 | class Eq | Eq |
+| equals_hash.py:16:5:16:28 | Function __ne__ | Class $@ implements __ne__ but does not implement __eq__. | equals_hash.py:11:1:11:17 | class Ne | Ne |

python/ql/test/2/query-tests/Classes/equals-hash/EqualsOrNotEquals.qlref

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+Classes/EqualsOrNotEquals.ql

python/ql/test/2/query-tests/Classes/equals-hash/equals_hash.py

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+#Equals and hash
+
+class Eq(object):
+
+    def __init__(self, data):
+        self.data = data
+
+    def __eq__(self, other):
+        return self.data == other.data
+
+class Ne(object):
+
+    def __init__(self, data):
+        self.data = data
+
+    def __ne__(self, other):
+        return self.data != other.data
+
+class Hash(object):
+
+    def __init__(self, data):
+        self.data = data
+
+    def __hash__(self):
+        return hash(self.data)
+    
+class Unhashable1(object):
+    
+    __hash__ = None
+    
+
+class EqOK1(Unhashable1):
+    
+    def __eq__(self, other):
+        return False
+    
+    def __ne__(self, other):
+        return True
+    
+class Unhashable2(object):
+    
+    #Not the idiomatic way of doing it, but not uncommon either
+    def __hash__(self):
+        raise TypeError("unhashable object")
+
+
+class EqOK2(Unhashable2):
+
+    def __eq__(self, other):
+        return False
+
+    def __ne__(self, other):
+        return True
+
+class ReflectiveNotEquals(object):
+
+    def __ne__(self, other):
+        return not self == other
+
+class EqOK3(ReflectiveNotEquals, Unhashable1):
+
+    def __eq__(self, other):
+        return self.data == other.data

python/ql/test/2/query-tests/Classes/inconsistent-mro/InconsistentMRO.expected

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+| inconsistent_mro.py:9:1:9:14 | class Z | Construction of class Z can fail due to invalid method resolution order(MRO) for bases $@ and $@. | inconsistent_mro.py:3:1:3:16 | class X | X | inconsistent_mro.py:6:1:6:11 | class Y | Y |

python/ql/test/2/query-tests/Classes/inconsistent-mro/InconsistentMRO.qlref

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+Classes/InconsistentMRO.ql

python/ql/test/2/query-tests/Classes/inconsistent-mro/inconsistent_mro.py

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+#Inconsistent MRO
+
+class X(object):
+    pass
+
+class Y(X):
+    pass
+
+class Z(X, Y):
+    pass
+    
+class O:
+    pass
+    
+#This is OK in Python 2
+class N(object, O):
+    pass

python/ql/test/2/query-tests/Classes/new-style/PropertyInOldStyleClass.expected

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+| property_old_style.py:8:6:8:13 | Property piosc | Property piosc will not work properly, as class OldStyle is an old-style class. |

python/ql/test/2/query-tests/Classes/new-style/PropertyInOldStyleClass.qlref

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+Classes/PropertyInOldStyleClass.ql