Remove phinx backend test from 5.x

The phinx backend was removed in 5.x, so the test for
MigrationsRollbackCommand is not applicable. This test was
incorrectly merged from 4.x where phinx backend still exists.

Author: dereuromark

tests/TestCase/MigrationsPluginTest.php

@@ -4,44 +4,22 @@
 namespace Migrations\Test\TestCase;
 
 use Cake\Console\CommandCollection;
-use Cake\Core\Configure;
 use Cake\TestSuite\TestCase;
-use Migrations\Command\MigrationsRollbackCommand;
 use Migrations\Command\RollbackCommand;
 use Migrations\MigrationsPlugin;
 
 class MigrationsPluginTest extends TestCase
 {
     /**
-     * Test that builtin backend uses RollbackCommand
+     * Test that console() registers RollbackCommand
      */
-    public function testConsoleBuiltinBackendUsesCorrectRollbackCommand(): void
+    public function testConsoleRegistersRollbackCommand(): void
     {
-        Configure::write('Migrations.backend', 'builtin');
-
         $plugin = new MigrationsPlugin();
         $commands = new CommandCollection();
         $commands = $plugin->console($commands);
 
         $this->assertTrue($commands->has('migrations rollback'));
         $this->assertSame(RollbackCommand::class, $commands->get('migrations rollback'));
     }
-
-    /**
-     * Test that phinx backend uses MigrationsRollbackCommand
-     *
-     * This is the reported bug in https://github.com/cakephp/migrations/issues/990
-     */
-    public function testConsolePhinxBackendUsesCorrectRollbackCommand(): void
-    {
-        Configure::write('Migrations.backend', 'phinx');
-
-        $plugin = new MigrationsPlugin();
-        $commands = new CommandCollection();
-        $commands = $plugin->console($commands);
-
-        $this->assertTrue($commands->has('migrations rollback'));
-        // Bug: RollbackCommand is loaded instead of MigrationsRollbackCommand
-        $this->assertSame(MigrationsRollbackCommand::class, $commands->get('migrations rollback'));
-    }
 }