test: fix test affected by user config

applies:
nostr:note14jnggugkcf9vg42tcu6h8c842xlxacsatw7uf889xjjdtqr0ptlsfa5tyh

closes
nostr:note1mm77j27kvmkwvvvvth7w4atgjhxrydafl5jkhh7eztkx4fxq4nqq6fnd6y

1 files changed, 3 insertions, 0 deletions

diff --git a/test_utils/src/git.rs b/test_utils/src/git.rs
index 76656df..db50165 100644
--- a/test_utils/src/git.rs
+++ b/test_utils/src/git.rs
@@ -25,6 +25,9 @@ impl GitTestRepo {
                 .initial_head(main_branch_name)
                 .mkpath(true),
         )?;
+        // Make sure we have standard diffs for the tests so that user-level config does
+        // not make them fail.
+        git_repo.config()?.set_bool("diff.mnemonicPrefix", false)?;
         Ok(Self {
             dir: path,
             git_repo,