Assert also element visibility instead of just finding it

Although if the element could not be found an exception would be thrown
and the test aborted if an element is in the DOM but hidden it would be
found and the test would pass.

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

tests/acceptance/features/bootstrap/AppsManagementContext.php

@@ -170,7 +170,9 @@ class AppsManagementContext implements Context, ActorAwareInterface {
 	 */
 	public function iSeeThatTheAppHasBeenEnabled($app) {
 		// TODO: Find a way to check if the enable button is removed
-		$this->actor->find(self::disableButtonForApp($app), 10);
+		PHPUnit_Framework_Assert::assertTrue(
+			$this->actor->find(self::disableButtonForApp($app), 10)->isVisible()
+		);
 	}
 
 	/**
@@ -178,7 +180,9 @@ class AppsManagementContext implements Context, ActorAwareInterface {
 	 */
 	public function iSeeThatTheAppHasBeenDisabled($app) {
 		// TODO: Find a way to check if the disable button is removed
-		$this->actor->find(self::enableButtonForApp($app), 10);
+		PHPUnit_Framework_Assert::assertTrue(
+			$this->actor->find(self::enableButtonForApp($app), 10)->isVisible()
+		);
 	}
 
 	/**
@@ -237,8 +241,12 @@ class AppsManagementContext implements Context, ActorAwareInterface {
 	 * @Given /^I see the app bundles$/
 	 */
 	public function iSeeTheAppBundles() {
-		$this->actor->find(self::rowForApp('Auditing / Logging'), 2);
-		$this->actor->find(self::rowForApp('LDAP user and group backend'), 2);
+		PHPUnit_Framework_Assert::assertTrue(
+			$this->actor->find(self::rowForApp('Auditing / Logging'), 2)->isVisible()
+		);
+		PHPUnit_Framework_Assert::assertTrue(
+			$this->actor->find(self::rowForApp('LDAP user and group backend'), 2)->isVisible()
+		);
 	}
 
 	/**