adding objects-specific errors

objects/catalog.py

@@ -1,6 +1,7 @@
 """Catalog module."""
 
 from .providers import Provider
+from .errors import Error
 
 
 class AbstractCatalog(object):
@@ -20,8 +21,8 @@ class AbstractCatalog(object):
             return attribute
 
         if attribute not in self.__used_providers__:
-            raise AttributeError('Provider \'{}\' is not listed in '
-                                 'dependencies'.format(item))
+            raise Error('Provider \'{}\' '.format(item) +
+                        'is not listed in dependencies')
         return attribute
 
     @classmethod

objects/errors.py

@@ -0,0 +1,6 @@
+"""Errors module."""
+
+
+class Error(Exception):
+
+    """Base error."""

objects/providers.py

@@ -8,6 +8,8 @@ from .utils import is_init_arg_injection
 from .utils import is_attribute_injection
 from .utils import is_method_injection
 
+from .errors import Error
+
 
 class Provider(object):
 
@@ -31,7 +33,7 @@ class Provider(object):
     def override(self, provider):
         """Override provider with another provider."""
         if not is_provider(provider):
-            raise TypeError('Expected provider as an overriding instance, '
+            raise Error('Expected provider as an overriding instance, '
                         'got {}'.format(str(provider)))
         self.overridden.append(provider)
 
@@ -41,7 +43,7 @@ class Provider(object):
         try:
             return self.overridden[-1]
         except IndexError:
-            raise AttributeError('Provider {} '.format(str(self)) +
+            raise Error('Provider {} '.format(str(self)) +
                         'is not overridden')
 
 
@@ -162,7 +164,7 @@ class Scoped(Singleton):
     def __call__(self, *args, **kwargs):
         """Return provided instance."""
         if not self.is_in_scope:
-            raise RuntimeError('Trying to provide {} '.format(self.provides) +
+            raise Error('Trying to provide {} '.format(self.provides) +
                         'while provider is not in scope')
         return super(Scoped, self).__call__(*args, **kwargs)
 
@@ -197,7 +199,7 @@ class ExternalDependency(Provider):
     def __call__(self, *args, **kwargs):
         """Return provided instance."""
         if not self.dependency:
-            raise ValueError('Dependency is not satisfied')
+            raise Error('Dependency is not satisfied')
 
         result = self.dependency.__call__(*args, **kwargs)
 
@@ -205,7 +207,7 @@ class ExternalDependency(Provider):
                            for possible_type in self.instance_of))
 
         if not is_instance:
-            raise TypeError('{} is not an '.format(result) +
+            raise Error('{} is not an '.format(result) +
                         'instance of {}'.format(self.instance_of))
 
         return result

tests/test_providers.py

@@ -17,6 +17,8 @@ from objects.providers import Config
 
 from objects.utils import is_provider
 
+from objects.errors import Error
+
 
 class ProviderTest(unittest.TestCase):
 
@@ -51,7 +53,7 @@ class ProviderTest(unittest.TestCase):
 
     def test_override_with_not_provider(self):
         """Test provider overriding with not provider instance."""
-        self.assertRaises(TypeError, Provider().override, object())
+        self.assertRaises(Error, Provider().override, object())
 
     def test_last_overriding(self):
         """Test getting last overriding provider."""
@@ -69,7 +71,7 @@ class ProviderTest(unittest.TestCase):
         """Test getting last overriding from not overridden provider."""
         try:
             Provider().last_overriding
-        except AttributeError:
+        except Error:
             pass
         else:
             self.fail('Got en error in {}'.format(