Fix double printing of exception when initializing resource causes error

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
+-------------------
+- Fix double printing of exception when initializing resource causes error.
+
 4.23.1
 ------
 - Hotfix a bug with importing FastAPI ``Request``.

src/dependency_injector/providers.pyx

@@ -3486,7 +3486,6 @@ cdef class Resource(Provider):
             resource = initializer.result()
         except Exception:
             self.__initialized = False
-            raise
         else:
             self.__resource = resource
             self.__shutdowner = shutdowner

tests/unit/providers/test_resource_py35.py

@@ -449,14 +449,45 @@ class AsyncResourceTest(AsyncTestCase):
         self.assertTrue(provider.initialized)
         self.assertTrue(provider.is_async_mode_enabled())
 
-        # Disable default exception handling to prevent output
-        asyncio.get_event_loop().set_exception_handler(lambda loop, context: ...)
+        with self.assertRaises(RuntimeError):
+            self._run(future)
+
+        self.assertFalse(provider.initialized)
+        self.assertTrue(provider.is_async_mode_enabled())
+
+    def test_init_async_gen_with_error(self):
+        async def _init():
+            raise RuntimeError()
+            yield
+
+        provider = providers.Resource(_init)
+
+        future = provider()
+        self.assertTrue(provider.initialized)
+        self.assertTrue(provider.is_async_mode_enabled())
 
         with self.assertRaises(RuntimeError):
             self._run(future)
 
-        # Restore default exception handling
-        asyncio.get_event_loop().set_exception_handler(None)
+        self.assertFalse(provider.initialized)
+        self.assertTrue(provider.is_async_mode_enabled())
+
+    def test_init_async_subclass_with_error(self):
+        class _Resource(resources.AsyncResource):
+            async def init(self):
+                raise RuntimeError()
+
+            async def shutdown(self, resource):
+                pass
+
+        provider = providers.Resource(_Resource)
+
+        future = provider()
+        self.assertTrue(provider.initialized)
+        self.assertTrue(provider.is_async_mode_enabled())
+
+        with self.assertRaises(RuntimeError):
+            self._run(future)
 
         self.assertFalse(provider.initialized)
         self.assertTrue(provider.is_async_mode_enabled())