Add new Abstract Aggregator Test to check qb aliases (for join clauses)

src/Bundle/ChillMainBundle/Test/Export/AbstractAggregatorTest.php

@@ -62,6 +62,18 @@ abstract class AbstractAggregatorTest extends KernelTestCase
         }
     }
 
+    /**
+     * provide data for `testAliasDidNotDisappears`.
+     */
+    public function dataProviderAliasDidNotDisappears()
+    {
+        foreach ($this->getQueryBuilders() as $qb) {
+            foreach ($this->getFormData() as $data) {
+                yield [clone $qb, $data];
+            }
+        }
+    }
+
     /**
      * Create an aggregator instance which will be used in tests.
      *
@@ -256,4 +268,29 @@ abstract class AbstractAggregatorTest extends KernelTestCase
             'test that the title is not empty'
         );
     }
+
+    /**
+     * Compare aliases array before and after that aggregator alter query
+     *
+     * @dataProvider dataProviderAliasDidNotDisappears
+     *
+     * @param QueryBuilder $qb
+     * @param array $data
+     * @return void
+     */
+    public function testAliasDidNotDisappears(QueryBuilder $qb, array $data)
+    {
+        $aliases = $qb->getAllAliases();
+
+        $this->getAggregator()->alterQuery($qb, $data);
+
+        $alteredQuery = $qb->getAllAliases();
+
+        $this->assertGreaterThanOrEqual(count($aliases), count($alteredQuery));
+
+        foreach ($aliases as $alias) {
+            $this->assertContains($alias, $alteredQuery);
+        }
+    }
+
 }