PHPUnit in Laravel removes old database records when executing new test method - phpunit

Question

I created a Laravel test class with PHPUnit which has two methods as below,
class MainLocationTest extends TestCase
{
use RefreshDatabase, TestUserTrait;
public static function getMainLocationCount(): int
{
return InventoryLocation::whereActive(1)->count();
}
/**
* Test main location creation
*/
public function testCreateMainLocation(): void
{
self::setActingAdminUser();
$this->assertEquals(0, self::getMainLocationCount());
$response = $this->postJson('/api/inventory/location/main/create', [
'location_name' => 'Test Main Location',
'location_address' => '',
'location_code' => '',
'location_manager_id' => '',
]);
$response->assertStatus(200);
$this->assertEquals(1, self::getMainLocationCount());
}
/**
* Test main location update
*/
public function testUpdateMainLocation(): void
{
self::setActingAdminUser();
$main_location = InventoryLocation::whereActive(1)->first();
$this->assertEquals('Test Main Location', $main_location->location_name);
$response = $this->postJson("/api/inventory/location/main/$main_location->id/edit", [
'location_name' => 'Test Main Location Updated',
'location_address' => '',
'location_code' => '',
'location_manager_id' => '',
]);
$response->assertStatus(200);
$main_location = InventoryLocation::find($main_location->id);
$this->assertEquals('Test Main Location Updated', $main_location->location_name);
}
}
My PHPUnit settings are,
<?xml version="1.0" encoding="UTF-8"?>
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="./vendor/phpunit/phpunit/phpunit.xsd"
bootstrap="vendor/autoload.php"
colors="true"
>
<testsuites>
<testsuite name="Unit">
<directory suffix="Test.php">./tests/Unit</directory>
</testsuite>
<testsuite name="Feature">
<directory suffix="Test.php">./tests/Feature</directory>
</testsuite>
<testsuite name="Modules">
<directory suffix="Test.php">./Modules/*/Tests/Feature</directory>
<directory suffix="Test.php">./Modules/*/Tests/Unit</directory>
</testsuite>
</testsuites>
<coverage processUncoveredFiles="true">
<include>
<directory suffix=".php">./app</directory>
</include>
</coverage>
<php>
<env name="APP_ENV" value="testing"/>
<env name="BCRYPT_ROUNDS" value="4"/>
<env name="CACHE_DRIVER" value="array"/>
<env name="DB_CONNECTION" value="sqlite"/>
<env name="DB_DATABASE" value=":memory:"/>
<env name="MAIL_MAILER" value="array"/>
<env name="QUEUE_CONNECTION" value="sync"/>
<env name="SESSION_DRIVER" value="array"/>
<env name="TELESCOPE_ENABLED" value="false"/>
</php>
</phpunit>
When I run the test cases, testCreateMainLocation test get passed and testUpdateMainLocation test throw an error saying Attempt to read property "location_name" on null. But, when two methods are merged into one and run, all tests get passed.
It seems database is getting deleted when coming to testUpdateMainLocation test. So, I cannot get the location which was created in the testCreateMainLocation test. Is there a way to avoid database refresh till the end of execution of the class?
(I tried removing RefreshDatabase trait. But, it was not successfull)