don't expose $content property

admin/class-metabox.php

@@ -630,7 +630,7 @@ function snippet() {
 
 			$snippet_preview = new WPSEO_Snippet_Preview( $post, $title, $description );
 
-			return $snippet_preview->content;
+			return $snippet_preview->get_content();
 		}
 
 		/**

admin/class-snippet-preview.php

@@ -12,7 +12,7 @@ class WPSEO_Snippet_Preview {
 		/**
 		 * The dynamically generated html for the snippet preview.
 		 */
-		public $content;
+		protected $content;
 
 		/**
 		 * The WPSEO options.
@@ -68,6 +68,14 @@ public function __construct( $post, $title, $description ) {
 			$this->set_content();
 		}
 
+		/**
+		 * Getter for $this->content
+		 * @return string html for snippet preview
+		 */
+		public function get_content() {
+			return $this->content;
+		}
+
 		/**
 		 * Sets date if available
 		 */

tests/test-class-wpseo-snippet-preview.php

@@ -9,7 +9,7 @@ class WPSEO_Snippet_Preview_Test extends WPSEO_UnitTestCase {
 	private $date;
 	private $url;
 
-	public function test_content_GIVEN_a_regular_post() {
+	public function test_get_content_GIVEN_a_regular_post() {
 		$this->post = $this->factory->post->create_and_get( array( 'post_title' => $this->title ) );
 		$this->date = $this->post->date;
 		$this->url  = str_replace( 'http://', '', get_bloginfo( 'url' ) ) . '/';
@@ -22,10 +22,10 @@ public function test_content_GIVEN_a_regular_post() {
 </div>
 HTML;
 		$snippet_preview = new WPSEO_Snippet_Preview( $this->post, $this->title, $this->description );
-		$this->assertEquals( $expected, $snippet_preview->content );
+		$this->assertEquals( $expected, $snippet_preview->get_content() );
 	}
 
-	public function test_content_GIVEN_a_post_that_is_frontpage() {
+	public function test_get_content_GIVEN_a_post_that_is_frontpage() {
 		$this->post = $this->factory->post->create_and_get( array( 'post_title' => $this->title ) );
 		$this->date = $this->post->date;
 		$this->url  = str_replace( 'http://', '', get_bloginfo( 'url' ) ) . '/';
@@ -41,6 +41,6 @@ public function test_content_GIVEN_a_post_that_is_frontpage() {
 </div>
 HTML;
 		$snippet_preview = new WPSEO_Snippet_Preview( $this->post, $this->title, $this->description );
-		$this->assertEquals( $expected, $snippet_preview->content );
+		$this->assertEquals( $expected, $snippet_preview->get_content() );
 	}
 }