refactor: err msgs 'cannot' > 'failed to'

in nearly all cases 'cannot' was used when an action was tried and
failed. 'failed to' is strictly better because:
* just because the action didn't work that time doesnt mean it
  cannot work
* it is better at drawing the users attention to a problem

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/ngit_init.rs b/tests/ngit_init.rs
index 1183b3c..4302524 100644
--- a/tests/ngit_init.rs
+++ b/tests/ngit_init.rs
@@ -309,7 +309,7 @@ mod when_repo_not_previously_claimed {
                     let cli_tester_handle = std::thread::spawn(move || -> Result<()> {
                         let yaml_path = git_repo.dir.join("maintainers.yaml");
                         let mut file = std::fs::File::create(&yaml_path)
-                            .expect("cannot create maintainers.yaml file");
+                            .expect("failed to create maintainers.yaml file");
                         write!(
                             file,
                             "\