<phpunit
  colors="true"
  bootstrap="bootstrap.php"
  convertErrorsToExceptions="true"
  convertNoticesToExceptions="true"
  convertWarningsToExceptions="true"
  strict="true"
  >
  <testsuite name="Sabre_HTTP">
      <directory>HTTP/</directory>
  </testsuite>

  <filter>
    <whitelist addUncoveredFilesFromWhitelist="true">
       <directory suffix=".php">../lib/</directory>
    </whitelist>
  </filter>

  <php>
    <env name="BASEURL" value="http://localhost"/>
  </php>
</phpunit>

<phpunit
  colors="true"
  beStrictAboutCoversAnnotation="true"
  beStrictAboutOutputDuringTests="true"
  beStrictAboutTestsThatDoNotTestAnything="true"
  beStrictAboutTodoAnnotatedTests="true"
  bootstrap="bootstrap.php"
  convertErrorsToExceptions="true"
  convertNoticesToExceptions="true"
  convertWarningsToExceptions="true"
  enforceTimeLimit="true"
  >
  <testsuite name="Sabre_HTTP">
      <directory>HTTP/</directory>
  </testsuite>

  <filter>
    <whitelist addUncoveredFilesFromWhitelist="true">
       <directory suffix=".php">../lib/</directory>
    </whitelist>
  </filter>

  <php>
    <env name="BASEURL" value="http://localhost"/>
  </php>
</phpunit>

Remove strict attribute in the XML configuration
Remove strict attribute in the XML configuration

Let PHPUnit be quiet

    PHPUnit 7.5.1 by Sebastian Bergmann and contributors.

      Warning - The configuration file did not pass validation!
      The following problems have been detected:

      Line 8:
      - Element 'phpunit', attribute 'strict': The attribute 'strict' is not allowed.

      Test results may not be as expected.

See https://github.com/sebastianbergmann/phpunit/commit/78c8865e4f4003acaf4ddc2f97bc963e1437bff4
