<?php

/**
 * @group Database
 */
class DatabaseResetTest extends MediaWikiIntegrationTestCase {
	public function testOne() {
		$result = $this->editPage( 'Test', 'x' );
		$this->assertTrue( $result->isOK() );
		$this->assertTrue( $result->getValue()['new'], 'Not new!' );
	}

	public function testTwo() {
		$result = $this->editPage( 'Test', 'x' );
		$this->assertTrue( $result->isOK() );
		$this->assertTrue( $result->getValue()['new'], 'Not new!' );
	}
}

$ PHPUNIT_WIKI=wiki /vagrant/mediawiki/tests/phpunit/phpunit.php DatabaseResetTest.php 
Using PHP 7.2.31-1+0~20200514.41+debian9~1.gbpe2a56b+wmf1
PHPUnit 8.5.19 by Sebastian Bergmann and contributors.
...
1) DatabaseResetTest::testTwo
Not new!
Failed asserting that false is true.