Replace traits with static classes in CLI unit tests

module/CLI/test/Util/CliTestUtils.php

@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ShlinkioTest\Shlink\CLI\Util;
+
+use PHPUnit\Framework\Assert;
+use PHPUnit\Framework\MockObject\Generator;
+use PHPUnit\Framework\MockObject\MockObject;
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputDefinition;
+use Symfony\Component\Console\Tester\CommandTester;
+
+class CliTestUtils
+{
+    public static function createCommandMock(string $name): MockObject & Command
+    {
+        static $generator = null;
+
+        if ($generator === null) {
+            $generator = new Generator();
+        }
+
+        $command = $generator->getMock(
+            Command::class,
+            callOriginalConstructor: false,
+            callOriginalClone: false,
+            cloneArguments: false,
+            allowMockingUnknownTypes: false,
+        );
+        $command->method('getName')->willReturn($name);
+        $command->method('isEnabled')->willReturn(true);
+        $command->method('getAliases')->willReturn([]);
+        $command->method('getDefinition')->willReturn(new InputDefinition());
+        $command->method('setApplication')->with(Assert::isInstanceOf(Application::class));
+
+        return $command;
+    }
+
+    public static function testerForCommand(Command $mainCommand, Command ...$extraCommands): CommandTester
+    {
+        $app = new Application();
+        $app->add($mainCommand);
+        foreach ($extraCommands as $command) {
+            $app->add($command);
+        }
+
+        return new CommandTester($mainCommand);
+    }
+}