test: add DB transaction tests

Author: kenjis

tests/system/Database/Live/TransactionTest.php

@@ -0,0 +1,106 @@
+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <[email protected]>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Database\Live;
+
+use CodeIgniter\Database\Exceptions\DatabaseException;
+use CodeIgniter\Test\CIUnitTestCase;
+use CodeIgniter\Test\DatabaseTestTrait;
+use Tests\Support\Database\Seeds\CITestSeeder;
+
+/**
+ * @group DatabaseLive
+ *
+ * @internal
+ */
+final class TransactionTest extends CIUnitTestCase
+{
+    use DatabaseTestTrait;
+
+    protected $refresh = true;
+    protected $seed    = CITestSeeder::class;
+
+    /**
+     * Sets $DBDebug to false.
+     *
+     * WARNING: this value will persist! take care to roll it back.
+     */
+    protected function disableDBDebug(): void
+    {
+        $this->setPrivateProperty($this->db, 'DBDebug', false);
+    }
+
+    /**
+     * Sets $DBDebug to true.
+     */
+    protected function enableDBDebug(): void
+    {
+        $this->setPrivateProperty($this->db, 'DBDebug', true);
+    }
+
+    public function testTransStartDBDebugTrue()
+    {
+        $builder = $this->db->table('job');
+
+        try {
+            $this->db->transStart();
+
+            $jobData = [
+                'name'        => 'Grocery Sales',
+                'description' => 'Discount!',
+            ];
+            $builder->insert($jobData);
+
+            // Duplicate entry '1' for key 'PRIMARY'
+            $jobData = [
+                'id'          => 1,
+                'name'        => 'Comedian',
+                'description' => 'Theres something in your teeth',
+            ];
+            $builder->insert($jobData);
+
+            $this->db->transComplete();
+        } catch (DatabaseException $e) {
+            // Do nothing.
+        }
+
+        $this->dontSeeInDatabase('job', ['name' => 'Grocery Sales']);
+    }
+
+    public function testTransStartDBDebugFalse()
+    {
+        $this->disableDBDebug();
+
+        $builder = $this->db->table('job');
+
+        $this->db->transStart();
+
+        $jobData = [
+            'name'        => 'Grocery Sales',
+            'description' => 'Discount!',
+        ];
+        $builder->insert($jobData);
+
+        // Duplicate entry '1' for key 'PRIMARY'
+        $jobData = [
+            'id'          => 1,
+            'name'        => 'Comedian',
+            'description' => 'Theres something in your teeth',
+        ];
+        $builder->insert($jobData);
+
+        $this->db->transComplete();
+
+        $this->dontSeeInDatabase('job', ['name' => 'Grocery Sales']);
+
+        $this->enableDBDebug();
+    }
+}