Foo1Command example

public function testAllWithCommandLoader()
    {
        $application = new Application();
        $commands = $application->all();
        $this->assertInstanceOf(HelpCommand::class, $commands['help'], '->all() returns the registered commands');

        $application->add(new \FooCommand());
        $commands = $application->all('foo');
        $this->assertCount(1, $commands, '->all() takes a namespace as its first argument');

        $application->setCommandLoader(new FactoryCommandLoader([
            'foo:bar1' => fn () => new \Foo1Command(),
        ]));
        $commands = $application->all('foo');
        $this->assertCount(2, $commands, '->all() takes a namespace as its first argument');
        $this->assertInstanceOf(\FooCommand::class, $commands['foo:bar'], '->all() returns the registered commands');
        $this->assertInstanceOf(\Foo1Command::class, $commands['foo:bar1'], '->all() returns the registered commands');
    }

    public function testRegister()
    {
        $application = new Application();
        $command = $application->register('foo');