Phpunit tests gives warning no tests found in class
/** @test */public function it_tests_something(){ ...}Adding that @test tells phpunit to treat the function as a test, regardless of the name.
The only methods that PHPUnit will recognize as tests are those with names starting with test.
So you should rename the it_fetches_posts() method to test_it_fetches_posts or testItFetchesPosts. The camel case naming is optional but useful if you use the --testdox option later.
Also, as stated in other answer you can also add the @test annotation to any method and it will be considered a test by PHPUnit.