tests: Corrupt archive import test is robust against different store prefixes.

* tests/store.scm ("import corrupt path"): Set 'index' to #x70.

1 files changed, 3 insertions, 2 deletions

diff --git a/tests/store.scm b/tests/store.scm
index 3eb8b7be5a..45aeb329b0 100644
--- a/tests/store.scm
+++ b/tests/store.scm
@@ -758,8 +758,9 @@
                 (cut export-paths %store (list file) <>))))
     (delete-paths %store (list file))
 
-    ;; Flip a bit in the stream's payload.
-    (let* ((index (quotient (bytevector-length dump) 4))
+    ;; Flip a bit in the stream's payload.  INDEX here falls in the middle of
+    ;; the file contents in DUMP, regardless of the store prefix.
+    (let* ((index #x70)
            (byte  (bytevector-u8-ref dump index)))
       (bytevector-u8-set! dump index (logxor #xff byte)))