public function test_post_exists_should_match_nonempty_title_content_and_date() {
    $title   = 'Foo Bar';
    $content = 'Foo Bar Baz';
    $date    = '2014-05-08 12:00:00';
    $p       = self::factory()->post->create(
      array(
        'post_title'   => $title,
        'post_content' => $content,
        'post_date'    => $date,
      )
    );

    $this->assertSame( $p, post_exists( $title, $content, $date ) );
  }