feat(single-file-tests): add make executable

single_file_tests/make_executable.rs

@@ -0,0 +1,14 @@
+use std::fs::File;
+use std::os::unix::fs::PermissionsExt;
+
+fn main() -> std::io::Result<()> {
+    let f = File::create("foo.txt")?;
+    let metadata = f.metadata()?;
+    let mut permissions = metadata.permissions();
+
+    println!("{}", permissions.mode());
+    println!("{:b}", permissions.mode());
+    
+    std::fs::set_permissions("foo.txt", PermissionsExt::from_mode(0o755))?;
+    Ok(())
+}