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StringGeneratorTest.php
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StringGeneratorTest.php
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<?php
namespace Eris\Generator;
use Eris\Random\RandomRange;
use Eris\Random\RandSource;
class StringGeneratorTest extends \PHPUnit\Framework\TestCase
{
/**
* @var RandomRange
*/
private $rand;
public function setUp(): void
{
$this->rand = new RandomRange(new RandSource());
}
public function testRandomlyPicksLengthAndCharacters()
{
$size = 10;
$generator = new StringGenerator();
$lengths = [];
$usedChars = [];
for ($i = 0; $i < 1000; $i++) {
$value = $generator($size, $this->rand)->unbox();
$length = strlen($value);
$this->assertLessThanOrEqual(10, $length);
$lengths = $this->accumulateLengths($lengths, $length);
$usedChars = $this->accumulateUsedChars($usedChars, $value);
}
$this->assertSame(11, count($lengths));
// only readable characters
$this->assertEquals(126 - 32, count($usedChars));
}
public function testRespectsTheGenerationSize()
{
$generationSize = 100;
$generator = new StringGenerator();
$value = $generator($generationSize, $this->rand)->unbox();
$this->assertLessThanOrEqual($generationSize, strlen($value));
}
public function testShrinksByChoppingOffChars()
{
$generator = new StringGenerator();
$lastValue = $generator($size = 10, $this->rand);
$this->assertSame('abcde', $generator->shrink(GeneratedValueSingle::fromJustValue('abcdef'))->unbox());
}
public function testCannotShrinkTheEmptyString()
{
$generator = new StringGenerator();
$minimumValue = GeneratedValueSingle::fromJustValue('');
$this->assertEquals($minimumValue, $generator->shrink($minimumValue));
}
private function accumulateLengths(array $lengths, $length)
{
if (!isset($lengths[$length])) {
$lengths[$length] = 0;
}
$lengths[$length]++;
return $lengths;
}
private function accumulateUsedChars(array $usedChars, $value)
{
for ($j = 0; $j < strlen($value); $j++) {
$char = $value[$j];
if (!isset($usedChars[$char])) {
$usedChars[$char] = 0;
}
$usedChars[$char]++;
}
return $usedChars;
}
}

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