def test_len(self, underlay, overlay):
"""
``__len__`` of the proxy does not count duplicates.
"""
proxy = _MergingMappingProxy(
overlay=overlay, underlay=underlay)
self.assertThat(len(proxy), Equals(len(list(proxy))))
def test_iter(self, underlay, overlay):
"""
``__iter__`` of the proxy does not produce duplicate keys.
"""
proxy = _MergingMappingProxy(overlay=overlay, underlay=underlay)
keys = sorted(list(proxy))
self.assertThat(keys, Equals(sorted(list(set(keys)))))
def test_iter(self, underlay, overlay):
"""
``__iter__`` of the proxy does not produce duplicate keys.
"""
proxy = _MergingMappingProxy(
overlay=overlay, underlay=underlay)
keys = sorted(list(proxy))
self.assertThat(keys, Equals(sorted(list(set(keys)))))
def test_get_underlay(self, underlay, overlay, key):
"""
Getting an key that only exists in the underlay returns the value from
the underlay.
"""
underlay[key] = object()
overlay.pop(key, None)
proxy = _MergingMappingProxy(overlay=overlay, underlay=underlay)
self.assertThat(proxy[key], Is(underlay[key]))
def test_contains(self, underlay, overlay, key):
"""
The mapping only contains a key if it can be gotten.
"""
proxy = _MergingMappingProxy(
overlay=overlay, underlay=underlay)
self.assertThat(
key in proxy,
Equals(proxy.get(key) is not None))
def test_get_both(self, underlay, overlay, key):
"""
Getting an key that exists in both the underlay and the overlay returns
the value from the overlay.
"""
underlay[key] = object()
overlay[key] = object()
proxy = _MergingMappingProxy(overlay=overlay, underlay=underlay)
self.assertThat(proxy[key], Not(Is(underlay[key])))
self.assertThat(proxy[key], Is(overlay[key]))
def test_get_underlay(self, underlay, overlay, key):
"""
Getting an key that only exists in the underlay returns the value from
the underlay.
"""
underlay[key] = object()
overlay.pop(key, None)
proxy = _MergingMappingProxy(
overlay=overlay, underlay=underlay)
self.assertThat(proxy[key], Is(underlay[key]))
def test_get_both(self, underlay, overlay, key):
"""
Getting an key that exists in both the underlay and the overlay returns
the value from the overlay.
"""
underlay[key] = object()
overlay[key] = object()
proxy = _MergingMappingProxy(
overlay=overlay, underlay=underlay)
self.assertThat(proxy[key], Not(Is(underlay[key])))
self.assertThat(proxy[key], Is(overlay[key]))
def test_contains(self, underlay, overlay, key):
"""
The mapping only contains a key if it can be gotten.
"""
proxy = _MergingMappingProxy(overlay=overlay, underlay=underlay)
self.assertThat(key in proxy, Equals(proxy.get(key) is not None))
def test_len(self, underlay, overlay):
"""
``__len__`` of the proxy does not count duplicates.
"""
proxy = _MergingMappingProxy(overlay=overlay, underlay=underlay)
self.assertThat(len(proxy), Equals(len(list(proxy))))