Ensure that migrations run

php-packages/testing/src/integration/Extension/ExtensionManagerIncludeCurrent.php

@@ -69,6 +69,14 @@ class ExtensionManagerIncludeCurrent extends ExtensionManager
         return $this->extensions;
     }
 
+    /**
+     * Since we enable every time, we always assume it's not enabled.
+     */
+    public function isEnabled($extension)
+    {
+        return false;
+    }
+
     /**
      * In test cases, enabled extensions are determined by the test case, not the database.
      */

php-packages/testing/tests/migrations/2021_05_11_000000_create_table_so_we_can_check_existence.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Flarum\Testing;
+
+use Flarum\Database\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+return Migration::createTable('testing_table', function (Blueprint $table) {
+    $table->string('id', 100)->primary();
+});

php-packages/testing/tests/tests/integration/TestCaseTest.php

@@ -14,6 +14,8 @@ use Flarum\Foundation\Config;
 use Flarum\Settings\SettingsRepositoryInterface;
 use Flarum\Testing\integration\TestCase;
 use Flarum\User\User;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
 
 class TestCaseTest extends TestCase
 {
@@ -112,6 +114,17 @@ class TestCaseTest extends TestCase
         $this->assertStringContainsString('notARealSetting', $response->getBody()->getContents());
     }
 
+    /**
+     * @test
+     */
+    public function current_extension_migrations_applied_if_specified()
+    {
+        $this->extension('flarum-testing-tests');
+
+        $tableExists = $this->app()->getContainer()->make(Builder::class)->hasTable('testing_table');
+        $this->assertTrue($tableExists);
+    }
+
     /**
      * @test
      */