test: Command transmission fallback handling

refs #950

test/php/Lib/StrikingCommandTransport.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Tests\Icinga\Module\Icingadb\Lib;
+
+use Icinga\Application\Config;
+use Icinga\Data\ConfigObject;
+use Icinga\Module\Icingadb\Command\IcingaApiCommand;
+use Icinga\Module\Icingadb\Command\Transport\ApiCommandTransport;
+use Icinga\Module\Icingadb\Command\Transport\CommandTransport;
+use Icinga\Module\Icingadb\Command\Transport\CommandTransportException;
+
+class StrikingCommandTransport extends CommandTransport
+{
+    public static function getConfig(): Config
+    {
+        return Config::fromArray(['endpoint1' => ['host' => 'endpointA'], 'endpoint2' => ['host' => 'endpointB']]);
+    }
+
+    public static function createTransport(ConfigObject $config): ApiCommandTransport
+    {
+        return (new class extends ApiCommandTransport {
+            protected function sendCommand(IcingaApiCommand $command)
+            {
+                throw new CommandTransportException(sprintf('%s strikes!', $this->getHost()));
+            }
+        })->setHost($config->host);
+    }
+}

test/php/library/Icingadb/Command/Transport/CommandTransportTest.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Tests\Icinga\Module\Icingadb\Command\Transport;
+
+use Icinga\Module\Icingadb\Command\Object\AddCommentCommand;
+use Icinga\Module\Icingadb\Command\Transport\CommandTransportException;
+use Icinga\Module\Icingadb\Model\Host;
+use PHPUnit\Framework\TestCase;
+use Tests\Icinga\Module\Icingadb\Lib\StrikingCommandTransport;
+
+class CommandTransportTest extends TestCase
+{
+    public function testFallbackHandling()
+    {
+        $this->expectException(CommandTransportException::class);
+        $this->expectExceptionMessage('endpointB strikes!');
+
+        (new StrikingCommandTransport())->send(
+            (new AddCommentCommand())
+                ->setExpireTime(42)
+                ->setAuthor('GLaDOS')
+                ->setComment('The cake is a lie')
+                ->setObjects(new \CallbackFilterIterator(new \ArrayIterator([
+                    (new Host())->setProperties(['name' => 'host1']),
+                    (new Host())->setProperties(['name' => 'host2']),
+                ]), function ($host) {
+                    return $host->name === 'host2';
+                }))
+        );
+    }
+
+    public function testGeneratorsAreNotSupported()
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Generators are not supported');
+
+        (new StrikingCommandTransport())->send(
+            (new AddCommentCommand())
+                ->setExpireTime(42)
+                ->setAuthor('GLaDOS')
+                ->setComment('The cake is a lie')
+                ->setObjects((function () {
+                    yield (new Host())->setProperties(['name' => 'host1']);
+                    yield (new Host())->setProperties(['name' => 'host2']);
+                })())
+        );
+    }
+}