Update QueryBuilderTest.php

tests/Doctrine/Tests/DBAL/Query/QueryBuilderTest.php

@@ -622,4 +622,24 @@ class QueryBuilderTest extends \Doctrine\Tests\DbalTestCase
         $this->assertFalse($qb->getQueryParts() === $qb_clone->getQueryParts());
         $this->assertFalse($qb->getParameters() === $qb_clone->getParameters());
     }
+
+    /**
+     * @group DBAL-790
+     */
+    public function testSelectWithJoinsWithNotUniqueAliases()
+    {
+        $qb = new QueryBuilder($this->conn);
+
+        $qb->select('a.id, b.id')
+            ->from('table_a', 'a')
+            ->join('a', 'table_b', 'b', 'a.fk_b = b.id')
+            ->join('a', 'table_b', 'b', 'a.fk_b = b.id')
+            ->join('b', 'table_a', 'a', 'a.fk_b = b.id');
+
+        $this->setExpectedException('QueryException');
+        $this->assertEquals(
+            'dumb string',
+            $qb->getSQL(),
+        );
+    }
 }