public function testShouldNotAllowSpecifyingDuplicateLocalStylesheets() { $this->testShouldAllowSpecifyingLocalStylesheet(); $this->helper->addStylesheet('/css/foo.css'); $css = $this->helper->getStylesheets(); $this->assertTrue(is_array($css)); $this->assertEquals(1, count($css)); $this->assertContains('/css/foo.css', $css); }