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<?php
use TypePhp\Exception\TestError;
/**
* PHP 8.3 typed class constants are covariant: an override may narrow the
* declared type (int|string -> int, mixed -> string, ?int -> int) but never
* widen it or move to an unrelated type.
*/
class ConstantOverrideCovarianceTest extends BaseTest
{
public function testNarrowingDeclaredTypeCompiles(): void
{
$this->compile('const_override_covariant.php');
}
public function testWideningDeclaredTypeIsRejected(): void
{
$this->exec(
'Declaration of `B::X` must be compatible with `A::X`',
'const_override_widened.php',
);
}
public function testUnrelatedDeclaredTypeIsRejected(): void
{
$this->exec(
'Declaration of `B::X` must be compatible with `A::X`',
'const_override_unrelated.php',
);
}
}