Add tests for selector provider

Author: rmk135

docs/main/changelog.rst

@@ -7,6 +7,10 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+Development version
+-------------------
+- Add tests for ``Selector`` provider.
+
 4.17.0
 ------
 - Add ``FastAPI`` + ``SQLAlchemy`` example.

tests/unit/providers/test_selector_py2_py3.py

@@ -6,7 +6,7 @@
 
 import unittest2 as unittest
 
-from dependency_injector import providers
+from dependency_injector import providers, errors
 
 
 class SelectorTests(unittest.TestCase):
@@ -33,6 +33,28 @@ def test_call(self):
         with self.selector.override('two'):
             self.assertEqual(provider(), 2)
 
+    def test_call_undefined_provider(self):
+        provider = providers.Selector(
+            self.selector,
+            one=providers.Object(1),
+            two=providers.Object(2),
+        )
+
+        with self.selector.override('three'):
+            with self.assertRaises(errors.Error):
+                provider()
+
+    def test_call_selector_is_none(self):
+        provider = providers.Selector(
+            self.selector,
+            one=providers.Object(1),
+            two=providers.Object(2),
+        )
+
+        with self.selector.override(None):
+            with self.assertRaises(errors.Error):
+                provider()
+
     def test_call_any_callable(self):
         provider = providers.Selector(
             functools.partial(next, itertools.cycle(['one', 'two'])),
@@ -70,6 +92,19 @@ def test_getattr(self):
         self.assertIs(provider.one, provider_one)
         self.assertIs(provider.two, provider_two)
 
+    def test_getattr_attribute_error(self):
+        provider_one = providers.Object(1)
+        provider_two = providers.Object(2)
+
+        provider = providers.Selector(
+            self.selector,
+            one=provider_one,
+            two=provider_two,
+        )
+
+        with self.assertRaises(AttributeError):
+            _ = provider.provider_three
+
     def test_call_overridden(self):
         provider = providers.Selector(self.selector, sample=providers.Object(1))
         overriding_provider1 = providers.Selector(self.selector, sample=providers.Object(2))
@@ -81,6 +116,18 @@ def test_call_overridden(self):
         with self.selector.override('sample'):
             self.assertEqual(provider(), 3)
 
+    def test_providers_attribute(self):
+        provider_one = providers.Object(1)
+        provider_two = providers.Object(2)
+
+        provider = providers.Selector(
+            self.selector,
+            one=provider_one,
+            two=provider_two,
+        )
+
+        self.assertEqual(provider.providers, {'one': provider_one, 'two': provider_two})
+
     def test_deepcopy(self):
         provider = providers.Selector(self.selector)