exercism-php/acronym/AcronymTest.php

<?php

/*
 * By adding type hints and enabling strict type checking, code can become
 * easier to read, self-documenting and reduce the number of potential bugs.
 * By default, type declarations are non-strict, which means they will attempt
 * to change the original type to match the type specified by the
 * type-declaration.
 *
 * In other words, if you pass a string to a function requiring a float,
 * it will attempt to convert the string value to a float.
 *
 * To enable strict mode, a single declare directive must be placed at the top
 * of the file.
 * This means that the strictness of typing is configured on a per-file basis.
 * This directive not only affects the type declarations of parameters, but also
 * a function's return type.
 *
 * For more info review the Concept on strict type checking in the PHP track
 * <link>.
 *
 * To disable strict typing, comment out the directive below.
 */

declare(strict_types=1);

class AcronymTest extends PHPUnit\Framework\TestCase
{
    public static function setUpBeforeClass(): void
    {
        require_once 'Acronym.php';
    }

    public function testBasicTitleCase(): void
    {
        $this->assertEquals('PNG', acronym('Portable Network Graphics'));
    }

    public function testLowerCaseWord(): void
    {
        $this->assertEquals('ROR', acronym('Ruby on Rails'));
    }

    public function testCamelCase(): void
    {
        $this->assertEquals('HTML', acronym('HyperText Markup Language'));
    }

    public function testAllCapsWords(): void
    {
        $this->assertEquals('PHP', acronym('PHP: Hypertext Preprocessor'));
    }

    public function testHyphenated(): void
    {
        $this->assertEquals('CMOS', acronym('Complementary metal-oxide semiconductor'));
    }

    // Additional points for making the following tests pass

    public function testOneWordIsNotAbbreviated(): void
    {
        $this->assertEmpty(acronym('Word'));
    }

    public function testUnicode(): void
    {
        $phrase = 'Специализированная процессорная часть';
        $this->assertEquals('СПЧ', acronym($phrase));
    }
}