Issue #3266525 by alexpott, quietone, xjm, daffie, longwave:...

   *   that Drupal no longer supports that PHP version.

   * - An error is shown in the status report that the PHP version is too old.

   */

  const MINIMUM_SUPPORTED_PHP = '8.0.2';

  const MINIMUM_SUPPORTED_PHP = '8.1.0';

  /**

   * Minimum allowed version of PHP for Drupal to be bootstrapped.

    $this->assertNotNull(\Drupal::accessManager());

  }

  /**

   * Tests the PHP constants have consistent values.

   */

  public function testPhpConstants() {

    // RECOMMENDED_PHP and MINIMUM_SUPPORTED_PHP can be just MAJOR.MINOR so

    // normalize them so that version_compare() can be used.

    $normalizer = function (string $version): string {

      // The regex below is from \Composer\Semver\VersionParser::normalize().

      preg_match('{^(\d{1,5})(\.\d++)?(\.\d++)?$}i', $version, $matches);

      return $matches[1]

        . (!empty($matches[2]) ? $matches[2] : '.9999999')

        . (!empty($matches[3]) ? $matches[3] : '.9999999');

    };

    $minimum_supported_php = $normalizer(\Drupal::MINIMUM_SUPPORTED_PHP);

    $recommended_php = $normalizer(\Drupal::RECOMMENDED_PHP);

    $this->assertTrue(version_compare($minimum_supported_php, \Drupal::MINIMUM_PHP, '>='), "\Drupal::MINIMUM_SUPPORTED_PHP should be greater or equal to \Drupal::MINIMUM_PHP");

    $this->assertTrue(version_compare($recommended_php, \Drupal::MINIMUM_SUPPORTED_PHP, '>='), "\Drupal::RECOMMENDED_PHP should be greater or equal to \Drupal::MINIMUM_SUPPORTED_PHP");

    // As this test depends on the $normalizer function it is tested.

    $this->assertSame('10.9999999.9999999', $normalizer('10'));

    $this->assertSame('10.1.9999999', $normalizer('10.1'));

    $this->assertSame('10.1.2', $normalizer('10.1.2'));

  }

  /**

   * Sets up a mock expectation for the container get() method.

   *