gnu: python-klayout: Fix failing test.

* gnu/packages/electronics.scm (python-klayout): Set environment
variable outside of python Popen call.

Merges guix/guix!5641

Change-Id: I29cc54bbb2cbfff2a43cb70b1066387e82190f2c
Signed-off-by: Cayetano Santos <csantosb@inventati.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/gnu/packages/electronics.scm b/gnu/packages/electronics.scm
index d1c1f4090ab..1e9502cfa49 100644
--- a/gnu/packages/electronics.scm
+++ b/gnu/packages/electronics.scm
@@ -2516,6 +2516,11 @@ for @acronym{EDA, elecronic design automation} and chip design.")))
             (lambda* (#:key tests? #:allow-other-keys)
               ;; Run the tests as specified in pyproject.toml.
               (when tests?
+                (substitute* "pyproject.toml"
+                  ;; Fix failing test
+                  (("TESTSRC=\\{package\\} ")
+                   ""))
+                (setenv "TESTSRC" ".")
                 (invoke "python"
                         #$(plain-file "python-klayout-test-runner.py"
                                       "import tomllib, subprocess