<?php
namespace Hamcrest\Text;

class StringStartsWithTest extends \Hamcrest\AbstractMatcherTest
{

    const EXCERPT = 'EXCERPT';

    private $_stringStartsWith;

    protected function setUp()
    {
        $this->_stringStartsWith = \Hamcrest\Text\StringStartsWith::startsWith(self::EXCERPT);
    }

    protected function createMatcher()
    {
        return $this->_stringStartsWith;
    }

    public function testEvaluatesToTrueIfArgumentContainsSpecifiedSubstring()
    {
        $this->assertTrue(
            $this->_stringStartsWith->matches(self::EXCERPT . 'END'),
            'should be true if excerpt at beginning'
        );
        $this->assertFalse(
            $this->_stringStartsWith->matches('START' . self::EXCERPT),
            'should be false if excerpt at end'
        );
        $this->assertFalse(
            $this->_stringStartsWith->matches('START' . self::EXCERPT . 'END'),
            'should be false if excerpt in middle'
        );
        $this->assertTrue(
            $this->_stringStartsWith->matches(self::EXCERPT . self::EXCERPT),
            'should be true if excerpt is at beginning and repeated'
        );

        $this->assertFalse(
            $this->_stringStartsWith->matches('Something else'),
            'should be false if excerpt is not in string'
        );
        $this->assertFalse(
            $this->_stringStartsWith->matches(substr(self::EXCERPT, 1)),
            'should be false if part of excerpt is at start of string'
        );
    }

    public function testEvaluatesToTrueIfArgumentIsEqualToSubstring()
    {
        $this->assertTrue(
            $this->_stringStartsWith->matches(self::EXCERPT),
            'should be true if excerpt is entire string'
        );
    }

    public function testHasAReadableDescription()
    {
        $this->assertDescription('a string starting with "EXCERPT"', $this->_stringStartsWith);
    }
}