def test_select_fallback(self):
"""If a named alternative is selected, but not set, the manager falls
back to the last alternative set."""
injection.select("dependency", "named-alternative")
injection.set("dependency", object())
injection.set("dependency", object())
self.assertIsNotNone(injection.get("dependency"))
def test_select_unset(self):
"""Selecting unset dependencies by name."""
injection.select("unset-dependency", "named-alternative")
value = object()
injection.set("unset-dependency", value, name = "named-alternative")
injection.set("unset-dependency", object())
self.assertIs(injection.get("unset-dependency"), value)
def test_get_unknown(self):
"""Retrieving unset dependencies raises exception."""
with self.assertRaises(injection.DependencyException):
unknown = injection.get("unknown-dependency")
