tests: Add 'with-environment-variable'.

* tests/scripts.scm (with-environment-variable): Move to...
* guix/tests.scm (with-environment-variable): ... here.
* tests/build-utils.scm ("wrap-program, one input, multiple calls"):
Use it instead of 'setenv'.

2 files changed, 17 insertions, 28 deletions

diff --git a/tests/build-utils.scm b/tests/build-utils.scm
index 7d49446f66..03216f9a35 100644
--- a/tests/build-utils.scm
+++ b/tests/build-utils.scm
@@ -107,19 +107,21 @@
        ;; it can't know about the bootstrap bash in the store, since it's not
        ;; named "bash".  Help it out a bit by providing a symlink it this
        ;; package's output.
-       (setenv "PATH" (dirname bash))
-       (wrap-program foo `("GUIX_FOO" prefix ("hello")))
-       (wrap-program foo `("GUIX_BAR" prefix ("world")))
-
-       ;; The bootstrap Bash is linked against an old libc and would abort with
-       ;; an assertion failure when trying to load incompatible locale data.
-       (unsetenv "LOCPATH")
-
-       (let* ((pipe (open-input-pipe foo))
-              (str  (get-string-all pipe)))
-         (with-directory-excursion directory
-           (for-each delete-file '("foo" ".foo-real")))
-         (and (zero? (close-pipe pipe))
-              str))))))
+       (with-environment-variable "PATH" (dirname bash)
+         (wrap-program foo `("GUIX_FOO" prefix ("hello")))
+         (wrap-program foo `("GUIX_BAR" prefix ("world")))
+
+         ;; The bootstrap Bash is linked against an old libc and would abort
+         ;; with an assertion failure when trying to load incompatible locale
+         ;; data.
+         (unsetenv "LOCPATH")
+
+         (let* ((pipe (open-input-pipe foo))
+                (str  (get-string-all pipe)))
+           (with-directory-excursion directory
+             (for-each delete-file '("foo" ".foo-real")))
+           (and (zero? (close-pipe pipe))
+                str)))))))
+
 
 (test-end)
diff --git a/tests/scripts.scm b/tests/scripts.scm
index 3901710953..efee271197 100644
--- a/tests/scripts.scm
+++ b/tests/scripts.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015, 2019 Ludovic Courtès <ludo@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -25,19 +25,6 @@
 
 ;; Test the (guix scripts) module.
 
-(define-syntax-rule (with-environment-variable variable value body ...)
-  "Run BODY with VARIABLE set to VALUE."
-  (let ((orig (getenv variable)))
-    (dynamic-wind
-      (lambda ()
-        (setenv variable value))
-      (lambda ()
-        body ...)
-      (lambda ()
-        (if orig
-            (setenv variable orig)
-            (unsetenv variable))))))
-
 
 (test-begin "scripts")