def test_new_instance(self):
"""It must return a new dict instance"""
a = dict(x=1)
b = dict(y=2)
c = deep_merge_dict(a, b)
self.assertIsNot(c, a)
self.assertIsNot(c, b)
def test_overwrite_new(self):
"""New simple entries must overwrite old ones"""
a = dict(x=1, y=1)
b = dict(y=2)
c = deep_merge_dict(a, b)
self.assertIn('y', c)
self.assertEqual(c['y'], b['y'])
def test_add_new(self):
"""New entries must be added"""
a = dict(x=1)
b = dict(y=2)
c = deep_merge_dict(a, b)
self.assertIn('y', c)
self.assertEqual(c['y'], b['y'])
def test_preserve_old(self):
"""Old entries must be preserved"""
a = dict(x=1)
b = dict(y=2)
c = deep_merge_dict(a, b)
self.assertIn('x', c)
self.assertEqual(c['x'], a['x'])
def test_new_instance_deep(self):
"""It must return new dict instances deep in the structure"""
x = dict()
y = dict()
a = dict(x=x)
b = dict(y=y)
c = deep_merge_dict(a, b)
self.assertIsNot(c['x'], x)
self.assertIsNot(c['y'], y)
def test_deep_merge(self):
"""New dict entries must merged"""
x1 = dict(w=1, y=2)
x2 = dict(y=3, z=4)
a = dict(x=x1)
b = dict(x=x2)
c = deep_merge_dict(a, b)
self.assertIn('x', c)
x = c['x']
self.assertIn('w', x)
self.assertIn('y', x)
self.assertIn('z', x)
self.assertEqual(x['w'], 1)
self.assertEqual(x['y'], 3)
self.assertEqual(x['z'], 4)