diff --git a/tests/phpunit/tests/rest-api/restOutputRsd.php b/tests/phpunit/tests/rest-api/restOutputRsd.php
new file mode 100644
index 0000000000000..6cecd7cb99789
--- /dev/null
+++ b/tests/phpunit/tests/rest-api/restOutputRsd.php
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * Tests for rest_output_rsd().
+ *
+ * @group restapi
+ *
+ * @covers ::rest_output_rsd
+ */
+class Tests_REST_API_RestOutputRsd extends WP_UnitTestCase {
+
+	/**
+	 * @ticket 65819
+	 */
+	public function test_outputs_wp_api_rsd_element() {
+		$api_root = esc_url( get_rest_url() );
+
+		$this->expectOutputRegex(
+			'#<api name="WP-API" blogID="1" preferred="false" apiLink="' . preg_quote( $api_root, '#' ) . '" />#'
+		);
+		rest_output_rsd();
+	}
+
+	/**
+	 * @ticket 65819
+	 */
+	public function test_outputs_nothing_when_rest_url_is_empty() {
+		add_filter( 'rest_url', '__return_empty_string' );
+
+		$this->expectOutputString( '' );
+		rest_output_rsd();
+	}
+}