minor #13482 Implemented check on interface implementation (jaytaph)

This PR was squashed before being merged into the 2.7 branch (closes #13482).

Discussion
----------

Implemented check on interface implementation

| Q             | A
| ------------- | ---
| Bug fix?      | Yes
| New feature?  | No
| BC breaks?    | No
| Deprecations? | No
| Tests pass?   | Yes
| Fixed tickets | #13480
| License       | MIT
| Doc PR        |

Commits
-------

2a79ace Implemented check on interface implementation

1 files changed, 6 insertions, 0 deletions

diff --git a/Core/Authentication/AuthenticationProviderManager.php b/Core/Authentication/AuthenticationProviderManager.php
index f713e8f..16de8da 100644
--- a/Core/Authentication/AuthenticationProviderManager.php
+++ b/Core/Authentication/AuthenticationProviderManager.php
@@ -48,6 +48,12 @@ class AuthenticationProviderManager implements AuthenticationManagerInterface
             throw new \InvalidArgumentException('You must at least add one authentication provider.');
         }
 
+        foreach ($providers as $provider) {
+            if (!$provider instanceof AuthenticationProviderInterface) {
+                throw new \InvalidArgumentException(sprintf('Provider "%s" must implement the AuthenticationProviderInterface.', get_class($provider)));
+            }
+        }
+
         $this->providers = $providers;
         $this->eraseCredentials = (bool) $eraseCredentials;
     }