feat(std/wasi) implement fd_filestat_set_size (#6558)

1 files changed, 17 insertions, 0 deletions

diff --git a/std/wasi/testdata/std_fs_file_set_len.rs b/std/wasi/testdata/std_fs_file_set_len.rs
new file mode 100644
index 000000000..27f1054c7
--- /dev/null
+++ b/std/wasi/testdata/std_fs_file_set_len.rs
@@ -0,0 +1,17 @@
+// { "preopens": { "/scratch": "scratch" } }
+
+fn main() {
+  let file = std::fs::File::create("/scratch/file").unwrap();
+
+  assert!(file.set_len(0).is_ok());
+  assert_eq!(file.metadata().unwrap().len(), 0);
+
+  assert!(file.set_len(5).is_ok());
+  assert_eq!(file.metadata().unwrap().len(), 5);
+
+  assert!(file.set_len(25).is_ok());
+  assert_eq!(file.metadata().unwrap().len(), 25);
+
+  assert!(file.set_len(0).is_ok());
+  assert_eq!(file.metadata().unwrap().len(), 0);
+}