Better exception message for inability to resolve service

Author: weierophinney

src/ServiceManager.php

@@ -366,8 +366,7 @@ private function getFactory($name)
         }
 
         throw new ServiceNotFoundException(sprintf(
-            'An invalid or missing factory was given for creating service "%s". Did you make sure you added the service
-             into the service manager configuration?',
+            'Unable to resolve service "%s" to a factory; are you certain you provided it during configuration?',
             $name
         ));
     }

test/CommonServiceLocatorBehaviorsTrait.php

@@ -505,7 +505,7 @@ public function testPassingInvalidInitializerTypeViaConfigurationRaisesException
     public function testGetRaisesExceptionWhenNoFactoryIsResolved()
     {
         $serviceManager = $this->createContainer();
-        $this->setExpectedException(ContainerException::class, 'invalid or missing factory');
+        $this->setExpectedException(ContainerException::class, 'Unable to resolve');
         $serviceManager->get('Some\Unknown\Service');
     }