Flunt API

Flunt.php

<?php

class Fluent
{
    protected $messages = [];

    public function hello()
    {
        $this->messages[] = 'hello';

        return $this;
    }

    public function world()
    {
        $this->messages[] = 'world';

        return $this;
    }

    public function say()
    {
        return implode(' ', $this->messages);
    }
}

FluntTest.php

<?php

use PHPUnit\Framework\TestCase;

class FluentTest extends TestCase
{
    public function test_fluent_api()
    {
        $fluent = (new TesterFluent())
          ->hello()
          ->assert(function ($messages) {
              $this->assertSame([
                  'hello',
              ], $messages);
          })
          ->world()
          ->assert(function ($messages) {
              $this->assertSame([
                  'hello',
                  'world',
              ], $messages);
          });

        $this->assertSame('hello world', $fluent->say());
    }
}

class FluentTest2 extends TestCase
{
    public function test_fluent_api()
    {
        $fluent = new Fluent();
        
        $fluent->hello();
        $this->assertSame('hello', $fluent->say());
        
        $fluent->world();
        $this->assertSame('hello world', $fluent->say());
    }
}

class FluentTest3 extends TestCase
{
    public function test_hello()
    {
        $fluent = new Fluent();
        
        $fluent->hello();
        $this->assertSame('hello', $fluent->say());
    }
    
    public function test_world()
    {
        $fluent = new Fluent();
        
        $fluent->world();
        $this->assertSame('world', $fluent->say());
    }
    
    public function test_hello_world()
    {
        $fluent = new Fluent();
        
        $fluent
            ->hello()
            ->world();
        $this->assertSame('hello world', $fluent->say());
    }
    
    public function test_world_hello()
    {
        $fluent = new Fluent();
        
        $fluent
            ->world()
            ->hello();
        $this->assertSame('world hello', $fluent->say());
    }
}

class TesterFluent extends Fluent
{
    public function assert(Closure $closure)
    {
        $closure($this->messages);

        return $this;
    }
}