diff --git a/tests/phpunit/tests/comment/commentAuthorUrl.php b/tests/phpunit/tests/comment/commentAuthorUrl.php
new file mode 100644
index 0000000000000..91b65f9e02626
--- /dev/null
+++ b/tests/phpunit/tests/comment/commentAuthorUrl.php
@@ -0,0 +1,118 @@
+<?php
+
+/**
+ * Tests for comment_author_url() and get_comment_author_url().
+ *
+ * @group comment
+ */
+class Tests_Comment_CommentAuthorUrl extends WP_UnitTestCase {
+
+	/**
+	 * Post fixture.
+	 *
+	 * @var int
+	 */
+	private static $post_id;
+
+	/**
+	 * Comment fixture.
+	 *
+	 * @var WP_Comment
+	 */
+	private static $comment;
+
+	public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ) {
+		self::$post_id = $factory->post->create();
+		self::$comment = $factory->comment->create_and_get(
+			array(
+				'comment_post_ID'    => self::$post_id,
+				'comment_author_url' => 'https://example.com/author',
+			)
+		);
+	}
+
+	public function tear_down() {
+		unset( $GLOBALS['comment'] );
+		parent::tear_down();
+	}
+
+	/**
+	 * @ticket 65819
+	 *
+	 * @covers ::get_comment_author_url
+	 */
+	public function test_returns_comment_author_url() {
+		$this->assertSame( 'https://example.com/author', get_comment_author_url( self::$comment->comment_ID ) );
+	}
+
+	/**
+	 * @ticket 65819
+	 *
+	 * @covers ::get_comment_author_url
+	 */
+	public function test_accepts_comment_object() {
+		$this->assertSame( 'https://example.com/author', get_comment_author_url( self::$comment ) );
+	}
+
+	/**
+	 * @ticket 65819
+	 *
+	 * @covers ::get_comment_author_url
+	 */
+	public function test_uses_global_comment_when_unspecified() {
+		$GLOBALS['comment'] = self::$comment;
+
+		$this->assertSame( 'https://example.com/author', get_comment_author_url() );
+	}
+
+	/**
+	 * @ticket 65819
+	 *
+	 * @covers ::get_comment_author_url
+	 */
+	public function test_returns_empty_string_when_url_missing() {
+		$comment_id = self::factory()->comment->create(
+			array(
+				'comment_post_ID'    => self::$post_id,
+				'comment_author_url' => '',
+			)
+		);
+
+		$this->assertSame( '', get_comment_author_url( $comment_id ) );
+	}
+
+	/**
+	 * @ticket 65819
+	 *
+	 * @covers ::get_comment_author_url
+	 */
+	public function test_filter_can_modify_url() {
+		add_filter(
+			'get_comment_author_url',
+			static function () {
+				return 'https://filtered.example.com';
+			}
+		);
+
+		$this->assertSame( 'https://filtered.example.com', get_comment_author_url( self::$comment->comment_ID ) );
+	}
+
+	/**
+	 * @ticket 65819
+	 *
+	 * @covers ::comment_author_url
+	 * @covers ::get_comment_author_url
+	 */
+	public function test_comment_author_url_echoes_value() {
+		add_filter(
+			'comment_url',
+			function ( $url ) {
+				$this->assertSame( 'https://example.com/author', $url );
+				return 'https://display.example.com';
+			}
+		);
+
+		$this->expectOutputString( 'https://display.example.com' );
+		comment_author_url( self::$comment->comment_ID );
+	}
+}