From 50b2db40ea03d8b3c78b3a774e057ebab0f98790 Mon Sep 17 00:00:00 2001
From: Liliana Marie Prikler <liliana.prikler@gmail.com>
Date: Sat, 19 Aug 2023 01:37:20 +0200
Subject: guix: emacs-utils: Add ert-number-tests.

* guix/build/utils.scm (ert-number-tests): New variable.
---
 guix/build/emacs-utils.scm | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'guix')

diff --git a/guix/build/emacs-utils.scm b/guix/build/emacs-utils.scm
index 850b1f5f2a..ac3dac57d1 100644
--- a/guix/build/emacs-utils.scm
+++ b/guix/build/emacs-utils.scm
@@ -40,6 +40,7 @@
             emacs-byte-compile-directory
             emacs-compile-directory
             emacs-header-parse
+            ert-number-tests
 
             as-display
             emacs-substitute-sexps
@@ -183,6 +184,19 @@ If native code is not supported, compile to bytecode instead."
              (insert " ")
              (insert ,(format #f "~s" replacement))))))
 
+(define (ert-number-tests file test-name)
+  "Add a numerically increasing suffix to tests of the same name.
+This fixes test errors of the pattern \"Test TEST_NAME redefined\"."
+  (emacs-batch-edit-file file
+    `(let ((i 0))
+       (while (re-search-forward ,(string-append "ert-deftest " test-name)
+                                 nil t)
+         (goto-char (match-beginning 0))
+         (kill-region (match-beginning 0) (match-end 0))
+         (insert (format "ert-deftest %s-%d" ,test-name i))
+         (setq i (+ i 1)))
+       (basic-save-buffer))))
+
 (define-syntax emacs-substitute-sexps
   (syntax-rules ()
     "Substitute the S-expression immediately following the first occurrence of
-- 
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