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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;
#[CoversClass(Constant::class)]
final class ConstantTest extends TestCase
{
public function testConstantCanBeInitialized(): void
{
$field = new Constant('machine_id', 10);
$this->assertSame('machine_id', $field->name);
$this->assertSame(10, $field->bits);
$this->assertSame(0, $field->value);
}
public function testMaxValueShouldBeCalculatedCorrectly(): void
{
$field = new Constant('machine_id', 10);
$maxValue = (1 << 10) - 1;
$this->assertSame($maxValue, $field->maxValue());
}
public function testInitialValueCanBeSet(): void
{
$field = new Constant('machine_id', 10, 2);
$this->assertSame(2, $field->value);
}
public function testInitialValueMustBePositive(): void
{
$this->expectException(\InvalidArgumentException::class);
$this->expectExceptionMessage('Field value must be non-negative.');
new Constant('machine_id', 10, -1);
}
public function testInitialValueMustNotExceedMaxValue(): void
{
$this->expectException(\InvalidArgumentException::class);
$this->expectExceptionMessage('Field value 1024 exceeds maximum 1023 for 10 bits.');
new Constant('machine_id', 10, 1024);
}
public function testConstantHasMakeFactoryMethod(): void
{
$field = Constant::make('machine_id', 10, 5);
$this->assertSame('machine_id', $field->name);
$this->assertSame(10, $field->bits);
$this->assertSame(5, $field->value);
}
public function testBitsMustBeAtLeastOne(): void
{
$this->expectException(\InvalidArgumentException::class);
$this->expectExceptionMessage('Bits must be between 1 and 63.');
new Constant('machine_id', 0);
}
public function testBitsMustNotExceed63(): void
{
$this->expectException(\InvalidArgumentException::class);
$this->expectExceptionMessage('Bits must be between 1 and 63.');
new Constant('machine_id', 64);
}
}
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