class StringTranslationTraitTest

class StringTranslationTraitTest extends UnitTestCase {
    
    /**
     * A reflection of self::$translation.
     *
     * @var \ReflectionClass
     */
    protected $reflection;
    
    /**
     * The mock under test that uses StringTranslationTrait.
     *
     * @var object
     * @see \PHPUnit\Framework\MockObject\Generator::getObjectForTrait()
     */
    protected $translation;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        $this->translation = $this->getObjectForTrait('\\Drupal\\Core\\StringTranslation\\StringTranslationTrait');
        $mock = $this->prophesize(TranslationInterface::class);
        $mock->translate(Argument::cetera())
            ->shouldNotBeCalled();
        $mock->formatPlural(Argument::cetera())
            ->shouldNotBeCalled();
        $mock->translateString(Argument::cetera())
            ->will(function ($args) {
            return $args[0]->getUntranslatedString();
        });
        $this->translation
            ->setStringTranslation($mock->reveal());
        $this->reflection = new \ReflectionClass(get_class($this->translation));
    }
    
    /**
     * @covers ::t
     */
    public function testT() {
        $method = $this->reflection
            ->getMethod('t');
        $method->setAccessible(TRUE);
        $result = $method->invoke($this->translation, 'something');
        $this->assertInstanceOf(TranslatableMarkup::class, $result);
        $this->assertEquals('something', $result);
    }
    
    /**
     * @covers ::formatPlural
     */
    public function testFormatPlural() {
        $method = $this->reflection
            ->getMethod('formatPlural');
        $method->setAccessible(TRUE);
        $result = $method->invoke($this->translation, 2, 'apple', 'apples');
        $this->assertInstanceOf(PluralTranslatableMarkup::class, $result);
        $this->assertEquals('apples', $result);
    }

}