diff --git a/tests/test.rs b/tests/test.rs
index f1b73bf161..4428109349 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -1,4 +1,4 @@
-use {super::*, pretty_assertions::assert_eq};
+use {super::*, fs::Permissions, pretty_assertions::assert_eq};
 
 macro_rules! test {
   {
@@ -99,6 +99,11 @@ impl Test {
     self
   }
 
+  pub(crate) fn chmod(self, path: impl AsRef<Path>, perm: Permissions) -> Self {
+    fs::set_permissions(self.tempdir.path().join(path.as_ref()), perm).unwrap();
+    self
+  }
+
   pub(crate) fn current_dir(mut self, path: impl AsRef<Path>) -> Self {
     path.as_ref().clone_into(&mut self.current_dir);
     self