"Hello World!" plugin tests

test-hello-world.php

<?php

class HelloWorldTest extends WP_UnitTestCase {
  function test_hello_world() {
    // Test hello_world()
    $this->assertEquals("Hello World!" == hello_world());
  }

  function test_hello_world_markup() {
    // Test hello_world_markup()
    ob_start();
    hello_world_markup();
    $result = ob_get_contents();
    ob_end_clean();

    $this->assertTrue(!empty(preg_match("/^<p\s+id='hello-world'>.*<\/p>$/", $result)));
  }

  function test_hello_world_css() {
    // Test hello_world_css()
    ob_start();
    hello_world_css();
    $result = ob_get_contents();
    ob_end_clean();

    // Make sure there are style tags being printed. Duh.
    $this->assertTrue(!empty(preg_match("/.*?.*<\/style>/s", $result)));

    // Make sure we're using the right selector
    $this->assertTrue((bool) strpos('hello-world', $result)));
  }
}