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.venv/Lib/site-packages/IPython/utils/tests/test_dir2.py

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+from IPython.utils.dir2 import dir2
+
+import pytest
+
+
+class Base(object):
+    x = 1
+    z = 23
+
+
+def test_base():
+    res = dir2(Base())
+    assert "x" in res
+    assert "z" in res
+    assert "y" not in res
+    assert "__class__" in res
+    assert res.count("x") == 1
+    assert res.count("__class__") == 1
+
+
+def test_SubClass():
+
+    class SubClass(Base):
+        y = 2
+
+    res = dir2(SubClass())
+    assert "y" in res
+    assert res.count("y") == 1
+    assert res.count("x") == 1
+
+
+def test_SubClass_with_trait_names_attr():
+    # usecase: trait_names is used in a class describing psychological classification
+
+    class SubClass(Base):
+        y = 2
+        trait_names = 44
+
+    res = dir2(SubClass())
+    assert "trait_names" in res
+
+
+def test_misbehaving_object_without_trait_names():
+    # dir2 shouldn't raise even when objects are dumb and raise
+    # something other than AttribteErrors on bad getattr.
+
+    class MisbehavingGetattr:
+        def __getattr__(self, attr):
+            raise KeyError("I should be caught")
+
+        def some_method(self):
+            return True
+
+    class SillierWithDir(MisbehavingGetattr):
+        def __dir__(self):
+            return ['some_method']
+
+    for bad_klass in (MisbehavingGetattr, SillierWithDir):
+        obj = bad_klass()
+
+        assert obj.some_method()
+
+        with pytest.raises(KeyError):
+            obj.other_method()
+
+        res = dir2(obj)
+        assert "some_method" in res