Ensured EntityManager is reopened by CloseDbConnectionMiddleware after an error closed it

module/Common/test/Middleware/CloseDbConnectionMiddlewareTest.php

@@ -10,6 +10,7 @@ use Prophecy\Prophecy\ObjectProphecy;
 use Psr\Http\Server\RequestHandlerInterface;
 use RuntimeException;
 use Shlinkio\Shlink\Common\Middleware\CloseDbConnectionMiddleware;
+use Throwable;
 use Zend\Diactoros\Response;
 use Zend\Diactoros\ServerRequest;
 
@@ -34,6 +35,7 @@ class CloseDbConnectionMiddlewareTest extends TestCase
         $this->em->getConnection()->willReturn($this->conn->reveal());
         $this->em->clear()->will(function () {
         });
+        $this->em->isOpen()->willReturn(true);
 
         $this->middleware = new CloseDbConnectionMiddleware($this->em->reveal());
     }
@@ -69,4 +71,31 @@ class CloseDbConnectionMiddlewareTest extends TestCase
 
         $this->middleware->process($req, $this->handler->reveal());
     }
+
+    /**
+     * @test
+     * @dataProvider provideClosed
+     */
+    public function entityManagerIsReopenedAfterAnExceptionWhichClosedIt(bool $closed): void
+    {
+        $req = new ServerRequest();
+        $expectedError = new RuntimeException();
+        $this->handler->handle($req)->willThrow($expectedError)
+                                    ->shouldBeCalledOnce();
+        $this->em->closed = $closed;
+        $this->em->isOpen()->willReturn(false);
+
+        try {
+            $this->middleware->process($req, $this->handler->reveal());
+            $this->fail('Expected exception to be thrown but it did not.');
+        } catch (Throwable $e) {
+            $this->assertSame($expectedError, $e);
+            $this->assertFalse($this->em->closed);
+        }
+    }
+
+    public function provideClosed(): iterable
+    {
+        return [[true, false]];
+    }
 }