fix: Bluesky link card repeats the post caption as the embed description

Leave the external embed description empty instead of copying the post
content already sent as the record text. Applies to both link posts and
image posts that carry a URL.

Fixes Codeinwp/tweet-old-post-pro#676

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: Alexia-Soare

includes/admin/helpers/class-rop-bluesky-api.php

@@ -504,7 +504,7 @@ private function get_external_post_url( $post ) {
 			'external' => array(
 				'uri'         => $post['post_url'],
 				'title'       => isset( $post['title'] ) ? $post['title'] : '',
-				'description' => isset( $post['content'] ) ? $post['content'] : '',
+				'description' => '',
 			),
 		);
 	}

phpunit.xml

@@ -46,6 +46,9 @@
         <testsuite name="bluesky-image">
             <directory>./tests/test-bluesky-image.php</directory>
         </testsuite>
+        <testsuite name="bluesky-card">
+            <directory>./tests/test-bluesky-card.php</directory>
+        </testsuite>
         <testsuite name="x-premium-limit">
             <directory>./tests/test-x-premium-limit.php</directory>
         </testsuite>

tests/test-bluesky-card.php

@@ -0,0 +1,78 @@
+<?php
+/**
+ * ROP Test Bluesky link card embed for PHPUnit.
+ *
+ * Reproduces GitHub issue Codeinwp/tweet-old-post-pro#676: the link card
+ * (app.bsky.embed.external) must not repeat the post caption as its
+ * description — Bluesky renders cards without a description as title + domain.
+ *
+ * @package     ROP
+ * @subpackage  Tests
+ * @license     http://opensource.org/licenses/gpl-2.0.php GNU Public License
+ */
+
+/**
+ * Test Bluesky link card. class.
+ */
+class Test_RopBlueskyCard extends WP_UnitTestCase {
+
+	/**
+	 * The link card description must be empty, not a copy of the post body.
+	 *
+	 * @covers Rop_Bluesky_Api::create_post
+	 */
+	public function test_link_card_description_is_empty() {
+		$captured = null;
+
+		$interceptor = function ( $preempt, $args, $url ) use ( &$captured ) {
+			if ( false === strpos( $url, 'com.atproto.repo.createRecord' ) ) {
+				return $preempt;
+			}
+			$captured = json_decode( $args['body'], true );
+
+			return array(
+				'headers'  => array(),
+				'body'     => wp_json_encode(
+					array(
+						'uri' => 'at://did:plc:test/app.bsky.feed.post/test',
+						'cid' => 'test-cid',
+					)
+				),
+				'response' => array(
+					'code'    => 200,
+					'message' => 'OK',
+				),
+				'cookies'  => array(),
+				'filename' => null,
+			);
+		};
+		add_filter( 'pre_http_request', $interceptor, 10, 3 );
+
+		$api = new Rop_Bluesky_Api( 'test.bsky.social', 'test-app-password' );
+		$api->create_post(
+			'did:plc:test',
+			array(
+				'content'  => 'My caption text for this share.',
+				'title'    => 'My Post Title',
+				'post_url' => 'https://example.org/my-post/',
+			),
+			'link',
+			'',
+			'test-access-token'
+		);
+
+		remove_filter( 'pre_http_request', $interceptor, 10 );
+
+		$this->assertNotNull( $captured, 'create_post() should have attempted a createRecord request.' );
+
+		$embed = $captured['record']['embed'];
+		$this->assertSame( 'app.bsky.embed.external', $embed['$type'] );
+		$this->assertSame( 'https://example.org/my-post/', $embed['external']['uri'] );
+		$this->assertSame( 'My Post Title', $embed['external']['title'] );
+		$this->assertSame(
+			'',
+			$embed['external']['description'],
+			'Link card description must be empty, not a duplicate of the post caption (issue #676).'
+		);
+	}
+}