Cleanup substring tests (function removed already b268b1) (beberlei#430)

Author: connorhu

tests/Query/Mysql/StringTest.php

@@ -73,42 +73,6 @@ public function testSoundex(): void
         );
     }
 
-    /**
-     * Test cases for MYSQL SUBSTRING function.
-     */
-    public function testSubstring(): void
-    {
-        $this->assertDqlProducesSql(
-            "SELECT SUBSTRING('www.mysql.com', 1, 3) from DoctrineExtensions\Tests\Entities\Blank b",
-            "SELECT SUBSTR('www.mysql.com', 1, 3) AS sclr_0 FROM Blank b0_"
-        );
-
-        $this->assertDqlProducesSql(
-            "SELECT SUBSTRING('www.mysql.com', 2) from DoctrineExtensions\Tests\Entities\Blank b",
-            "SELECT SUBSTR('www.mysql.com', 2, LENGTH('www.mysql.com')) AS sclr_0 FROM Blank b0_"
-        );
-
-        $this->assertDqlProducesSql(
-            "SELECT SUBSTRING('www.mysql.com', -2, 2) from DoctrineExtensions\Tests\Entities\Blank b",
-            "SELECT SUBSTR('www.mysql.com', -2, 2) AS sclr_0 FROM Blank b0_"
-        );
-
-        $this->assertDqlProducesSql(
-            'SELECT SUBSTRING(b.id, 5, 5) from DoctrineExtensions\Tests\Entities\Blank b',
-            'SELECT SUBSTR(b0_.id, 5, 5) AS sclr_0 FROM Blank b0_'
-        );
-
-        $this->assertDqlProducesSql(
-            'SELECT SUBSTRING(b.id, 5) from DoctrineExtensions\Tests\Entities\Blank b',
-            'SELECT SUBSTR(b0_.id, 5, LENGTH(b0_.id)) AS sclr_0 FROM Blank b0_'
-        );
-
-        $this->assertDqlProducesSql(
-            'SELECT SUBSTRING(b.id, -5, 2) from DoctrineExtensions\Tests\Entities\Blank b',
-            'SELECT SUBSTR(b0_.id, -5, 2) AS sclr_0 FROM Blank b0_'
-        );
-    }
-
     /**
      * Test cases for MYSQL SUBSTRING_INDEX function.
      */