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SequenceGeneratorTest.php
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SequenceGeneratorTest.php
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<?php
namespace Eris\Generator;
use Eris\Random\RandomRange;
use Eris\Random\RandSource;
class SequenceGeneratorTest extends \PHPUnit\Framework\TestCase
{
/**
* @var int
*/
private $size;
/**
* @var ChooseGenerator
*/
private $singleElementGenerator;
/**
* @var RandomRange
*/
private $rand;
protected function setUp(): void
{
$this->size = 100;
$this->singleElementGenerator = new ChooseGenerator(10, 100);
$this->rand = new RandomRange(new RandSource());
}
public function testRespectsGenerationSize()
{
$generator = new SequenceGenerator($this->singleElementGenerator);
$countLessThanSize = 0;
$countEqualToSize = 0;
for ($size = 0; $size < 400; $size++) {
$sequenceSize = count($generator($size, $this->rand)->unbox());
if ($sequenceSize < $size) {
$countLessThanSize++;
}
if ($sequenceSize === $size) {
$countEqualToSize++;
}
}
$this->assertTrue(
$countLessThanSize > 0,
"Sequence generator does not generate sequences less than the size."
);
$this->assertTrue(
($countLessThanSize + $countEqualToSize) === 400,
"Sequence generator has generated sequences greater than the size."
);
}
public function testShrink()
{
$generator = new SequenceGenerator($this->singleElementGenerator);
$elements = $generator($this->size, $this->rand);
$elementsAfterShrink = $generator->shrink($elements);
if ($elementsAfterShrink->count() == 0) {
// the generated value couldn't be shrunk
return;
}
$this->assertLessThanOrEqual(count($elements->unbox()), count($elementsAfterShrink->unbox()));
$this->assertLessThanOrEqual(array_sum($elements->unbox()), array_sum($elementsAfterShrink->unbox()));
}
public function testShrinkEmptySequence()
{
$generator = new SequenceGenerator($this->singleElementGenerator);
$elements = $generator($size = 0, $this->rand);
$this->assertEquals(0, count($elements->unbox()));
$this->assertEquals(0, count($generator->shrink($elements)));
}
public function testShrinkEventuallyEndsUpWithNoOptions()
{
$numberOfShrinks = 0;
$generator = new SequenceGenerator($this->singleElementGenerator);
$value = $generator($this->size, $this->rand);
$options = $generator->shrink($value);
while (count($options) > 0) {
if ($numberOfShrinks++ > 100) {
$this->fail('Too many shrinks');
}
$options = $generator->shrink($options->first());
}
$this->assertEquals(0, $options->count());
}
}

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SequenceGeneratorTest.php (2 KB)

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