{

public function testSendRootsListChangedSendsNotificationWhenCapabilityDeclared(): void

{

$sent = [];

$transport = $this->createMock(TransportInterface::class);

$transport->method('send')->willReturnCallback(static function (string $data) use (&$sent): void {

$sent[] = $data;

});

// Stand in for a completed initialize handshake, which the transport drives.

$transport->method('setState')->willReturnCallback(static function (ClientStateInterface $state): void {

$state->setInitialized(true);

});

$client = Client::builder()

->setClientInfo('Roots Test', '1.0.0')

->setCapabilities(new ClientCapabilities(roots: true, rootsListChanged: true))

->build();

$client->connect($transport);

$client->sendRootsListChanged();

$this->assertCount(1, $sent);

$decoded = json_decode($sent[0], true);

$this->assertSame('notifications/roots/list_changed', $decoded['method']);

}

public function testSendRootsListChangedThrowsWhenCapabilityNotDeclared(): void

{

$transport = $this->createMock(TransportInterface::class);

$transport->expects($this->never())->method('send');

$client = Client::builder()

->setClientInfo('Roots Test', '1.0.0')

->setCapabilities(new ClientCapabilities(roots: true))

->build();

$client->connect($transport);

$this->expectException(RuntimeException::class);

$this->expectExceptionMessage('roots.listChanged');

$client->sendRootsListChanged();

}

public function testSendRootsListChangedThrowsWhenNotConnected(): void

{

$client = Client::builder()

->setClientInfo('Roots Test', '1.0.0')

->setCapabilities(new ClientCapabilities(roots: true, rootsListChanged: true))

->build();

$this->expectException(ConnectionException::class);

$this->expectExceptionMessage('Client is not connected.');

$client->sendRootsListChanged();

}