How write unit test for yii2 project - mongodb

Question

I read every documents that i found and set up codeception to write unit test for yii2 application.
My project using mongodb as database and when i run my unit test to test save action of my model then i see that db component not found.
It's true because i'm using mongodb and don't need db for sql. anyway when i change my settings to rename mongodb database setting to db and still using mongodb connection settings i see error that means yii2 are trying to use SQL activerecord methods.
My test class:
namespace common\tests;
use common\models\Developer;
use common\tests\fixtures\DeveloperFixture;
use Faker\Factory;
class DeveloperTest extends \Codeception\Test\Unit
{
/**
* #var \common\tests\UnitTester
*/
protected $tester;
/**
* #return array
*/
public function _fixtures()
{
return [
'user' => [
'class' => DeveloperFixture::class,
'dataFile' => codecept_data_dir() . 'developer.php'
]
];
}
/**
* Test to saving user in database.
* We are using Factory object to create dynamic test cases.
*/
public function testSaving()
{
// use the factory to create a Faker\Generator instance
$faker = Factory::create();
$developer = new Developer([
'name' => $faker->name,
'description' => $faker->sentences
]);
$this->assertTrue($developer->save(), 'Developer object saved into database.');
}
protected function _before()
{
}
protected function _after()
{
}
}
My commont/config/test-local.php
<?php
return yii\helpers\ArrayHelper::merge(
require __DIR__ . '/main.php',
require __DIR__ . '/main-local.php',
require __DIR__ . '/test.php',
[
'components' => [
'mongodb' => require_once ('conf.d/test-db.php')
],
]
);
My common/config/conf.d/test-db.php
<?php
return
[
'class' => '\yii\mongodb\Connection',
'dsn' => 'mongodb://mongodb/mytestdb', //Using docker container
];
My fixture class:
<?php
namespace common\tests\fixtures;
use yii\mongodb\ActiveFixture;
/**
* Class Developer
* Active fixture for using Developer model.
*
* #package common\tests\fixtures
*/
class DeveloperFixture extends ActiveFixture
{
public $modelClass = \common\models\Developer::class;
}
After that i run vendor/bin/codecept -c core/common run unit models/DeveloperTest
I see below error:
---------
1) DeveloperTest: Saving
Test tests/unit/models/DeveloperTest.php:testSaving
[yii\base\InvalidConfigException] Failed to instantiate component or class "db".
#1 /app/vendor/yiisoft/yii2/di/Instance.php:139
#2 /app/vendor/yiisoft/yii2/di/Container.php:428
#3 /app/vendor/yiisoft/yii2/di/Container.php:364
#4 /app/vendor/yiisoft/yii2/di/Container.php:156
#5 /app/vendor/yiisoft/yii2/di/Instance.php:167
#6 /app/vendor/yiisoft/yii2/di/Instance.php:137
#7 /app/vendor/yiisoft/yii2/test/DbFixture.php:41
#8 /app/vendor/yiisoft/yii2/base/BaseObject.php:109
#9 yii\base\BaseObject->__construct
#10 /app/vendor/yiisoft/yii2/di/Container.php:375
#1 /app/vendor/yiisoft/yii2/di/Container.php:428
#2 /app/vendor/yiisoft/yii2/di/Container.php:364
#3 /app/vendor/yiisoft/yii2/di/Container.php:156
#4 /app/vendor/yiisoft/yii2/di/Instance.php:167
#5 /app/vendor/yiisoft/yii2/di/Instance.php:137
#6 /app/vendor/yiisoft/yii2/test/DbFixture.php:41
#7 /app/vendor/yiisoft/yii2/base/BaseObject.php:109
#8 yii\base\BaseObject->__construct
#9 /app/vendor/yiisoft/yii2/di/Container.php:375
#10 /app/vendor/yiisoft/yii2/di/Container.php:156
--
There was 1 failure:
---------
1) DeveloperTest: Saving
Test tests/unit/models/DeveloperTest.php:testSaving
Developer object saved into database.
Failed asserting that false is true.
#1 /app/core/common/tests/unit/models/DeveloperTest.php:42
And when i change mongodb in test-local.php to db i see below error log:
---------
1) DeveloperTest: Saving
Test tests/unit/models/DeveloperTest.php:testSaving
[yii\base\UnknownMethodException] Calling unknown method: yii\mongodb\Command::checkIntegrity()
#1 /app/vendor/yiisoft/yii2/base/BaseObject.php:222
#2 /app/vendor/yiisoft/yii2/test/InitDbFixture.php:96
#3 /app/vendor/yiisoft/yii2/test/InitDbFixture.php:78
#4 /app/vendor/yiisoft/yii2/test/FixtureTrait.php:117
#5 /app/vendor/symfony/event-dispatcher/EventDispatcher.php:212
#6 /app/vendor/symfony/event-dispatcher/EventDispatcher.php:44
--
There was 1 failure:
---------
1) DeveloperTest: Saving
Test tests/unit/models/DeveloperTest.php:testSaving
Developer object saved into database.
Failed asserting that false is true.
#1 /app/core/common/tests/unit/models/DeveloperTest.php:42
ERRORS!
Tests: 1, Assertions: 1, Errors: 1, Failures: 1.
Anyone can help me?

Answer 1

This is a bug in core of framework module for codeception. You can duplicate database connection in common/config/test-local.php:
'db' => [
'class' => yii\mongodb\Connection::class,
'dsn' => 'mongodb://localhost:27017/app_test_db',
],
'mongodb' => [
'class' => yii\mongodb\Connection::class,
'dsn' => 'mongodb://localhost:27017/app_test_db',
],