diff --git a/gnu/packages/textutils.scm b/gnu/packages/textutils.scm
index 25de916fcb..4374f59ffa 100644
--- a/gnu/packages/textutils.scm
+++ b/gnu/packages/textutils.scm
@@ -1,6 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2015 Taylan Ulrich Bayırlı/Kammer <taylanbayirli@gmail.com>
-;;; Copyright © 2015, 2016, 2017, 2018, 2019, 2020 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2015, 2016, 2017, 2018, 2019, 2020, 2024 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2015, 2016 Ben Woodcroft <donttrustben@gmail.com>
 ;;; Copyright © 2015 Roel Janssen <roel@gnu.org>
 ;;; Copyright © 2016 Jelle Licht <jlicht@fsfe.org>
@@ -84,7 +84,8 @@
   #:use-module (gnu packages ruby)
   #:use-module (gnu packages slang)
   #:use-module (gnu packages syncthing)
-  #:use-module (gnu packages web))
+  #:use-module (gnu packages web)
+  #:use-module (gnu packages xorg))
 
 (define-public dos2unix
   (package
@@ -944,13 +945,24 @@ Filter, list, or split a tar file.
                 "0dyflzvxq2wvs0rgqfyi5yzzrb6r4bzw2dm8cl304dakxk38ddys"))))
     (build-system ant-build-system)
     (arguments
-     `(;; FIXME: some tests fail because locale resources cannot be found.
-       ;; Even when I add them to the class path,
-       ;; RSyntaxTextAreaEditorKitDumbCompleteWordActionTest fails.
-       #:tests? #f
-       #:jar-name "rsyntaxtextarea.jar"))
+     (list
+      #:jar-name "rsyntaxtextarea.jar"
+      #:phases
+      '(modify-phases %standard-phases
+         (add-before 'build 'copy-resources
+           (lambda _
+             (copy-recursively "src/main/resources" "build/classes")))
+         (add-before 'check 'start-xorg-server
+           (lambda _
+             ;; The test suite requires a running X server.
+             (system "Xvfb :1 &")
+             (setenv "DISPLAY" ":1")
+             ;; Prevent irrelevant errors that cause test output mismatches:
+             ;; ‘Fontconfig error: No writable cache directories’
+             (setenv "XDG_CACHE_HOME" (getcwd)))))))
     (native-inputs
-     (list java-junit java-hamcrest-core))
+     (list java-junit java-hamcrest-core
+           xorg-server-for-tests))
     (home-page "https://bobbylight.github.io/RSyntaxTextArea/")
     (synopsis "Syntax highlighting text component for Java Swing")
     (description "RSyntaxTextArea is a syntax highlighting, code folding text