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<?php
declare(strict_types=1);
namespace Zhineng\Snowflake\Tests;
use PHPUnit\Framework\Attributes\CoversClass;
use PHPUnit\Framework\TestCase;
use Zhineng\Snowflake\Constant;
use Zhineng\Snowflake\Sequence;
use Zhineng\Snowflake\Structure;
#[CoversClass(Structure::class)]
final class StructureTest extends TestCase
{
public function testAddFieldAndRetrieveComponents(): void
{
$struct = new Structure;
$struct->add(Constant::make('machine_id', 10));
$this->assertCount(1, $struct->components());
}
public function testAddMultipleFields(): void
{
$struct = new Structure;
$struct->add(Constant::make('machine_id', 5));
$struct->add(Constant::make('datacenter_id', 5));
$this->assertCount(2, $struct->components());
}
public function testOffsetsAreCalculatedCorrectly(): void
{
$struct = new Structure;
$struct->add($machineId = Constant::make('machine_id', 5));
$struct->add($dataCenterId = Constant::make('datacenter_id', 5));
$this->assertSame(0, $machineId->offset());
$this->assertSame(5, $dataCenterId->offset());
}
public function testSizeResolution(): void
{
$struct = new Structure;
$struct->add(Constant::make('machine_id', 5));
$struct->add(Constant::make('datacenter_id', 5));
$this->assertSame(10, $struct->size());
}
public function testAtMostOneSequenceIsAllowed(): void
{
$struct = new Structure;
$struct->add(Sequence::make('seq1', 12));
$this->expectException(\LogicException::class);
$this->expectExceptionMessage('Only one sequence field is allowed in a structure.');
$struct->add(Sequence::make('seq2', 12));
}
public function testTotalSizeCannotExceed63Bits(): void
{
$struct = new Structure;
$struct->add(Constant::make('field1', 32));
$struct->add(Constant::make('field2', 31));
$this->expectException(\OverflowException::class);
$this->expectExceptionMessage('Total structure size cannot exceed 63 bits.');
$struct->add(Constant::make('field3', 1));
}
}
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