class TranslatableMarkupTest

class TranslatableMarkupTest extends UnitTestCase {
  
  /**
   * The error message of the last error in the error handler.
   *
   * @var string
   */
  protected $lastErrorMessage;
  
  /**
   * The error number of the last error in the error handler.
   *
   * @var int
   */
  protected $lastErrorNumber;
  
  /**
   * Custom error handler that saves the last error.
   *
   * We need this custom error handler because we cannot rely on the error to
   * exception conversion as __toString is never allowed to leak any kind of
   * exception.
   *
   * @param int $error_number
   *   The error number.
   * @param string $error_message
   *   The error message.
   */
  public function errorHandler($error_number, $error_message) {
    $this->lastErrorNumber = $error_number;
    $this->lastErrorMessage = $error_message;
  }
  
  /**
   * Tests that errors are correctly handled when a __toString() fails.
   *
   * @covers ::__toString
   */
  public function testToString() : void {
    $translation = $this->createMock(TranslationInterface::class);
    $string = 'May I have an exception?';
    $text = $this->getMockBuilder(TranslatableMarkup::class)
      ->setConstructorArgs([
      $string,
      [],
      [],
      $translation,
    ])
      ->onlyMethods([
      '_die',
    ])
      ->getMock();
    $text->expects($this->once())
      ->method('_die')
      ->willReturn('');
    $translation->method('translateString')
      ->with($text)
      ->willReturnCallback(function () {
      throw new \Exception('Yes you may.');
    });
    // We set a custom error handler because of https://github.com/sebastianbergmann/phpunit/issues/487
    set_error_handler([
      $this,
      'errorHandler',
    ]);
    // We want this to trigger an error.
    (string) $text;
    restore_error_handler();
    $this->assertEquals(E_USER_ERROR, $this->lastErrorNumber);
    $this->assertMatchesRegularExpression('/Exception thrown while calling __toString on a .*Mock_TranslatableMarkup_.* object in .*TranslatableMarkupTest.php on line [0-9]+: Yes you may./', $this->lastErrorMessage);
  }
  
  /**
   * @covers ::__construct
   */
  public function testIsStringAssertion() : void {
    $translation = $this->getStringTranslationStub();
    $this->expectException(\InvalidArgumentException::class);
    $this->expectExceptionMessage('$string ("foo") must be a string.');
    new TranslatableMarkup(new TranslatableMarkup('foo', [], [], $translation));
  }
  
  /**
   * @covers ::__construct
   */
  public function testIsStringAssertionWithFormattableMarkup() : void {
    $formattable_string = new FormattableMarkup('@bar', [
      '@bar' => 'foo',
    ]);
    $this->expectException(\InvalidArgumentException::class);
    $this->expectExceptionMessage('$string ("foo") must be a string.');
    new TranslatableMarkup($formattable_string);
  }

}