Add test

rust-lang · frewsxcv · May 3, 2017 · May 3, 2017 · May 3, 2017 · May 3, 2017
commit 3305e74979310fbf0521530d11105dbbb64ae409
diff --git a/src/libstd/sys/windows/os.rs b/src/libstd/sys/windows/os.rs
@@ -317,3 +317,17 @@ pub fn home_dir() -> Option<PathBuf> {
 pub fn exit(code: i32) -> ! {
     unsafe { c::ExitProcess(code as c::UINT) }
 }
+
+#[cfg(test)]
+mod tests {
+    use io::Error;
+    use sys::c;
+
+    // tests `error_string` above
+    #[test]
+    fn ntstatus_error() {
+        const STATUS_UNSUCCESSFUL: u32 = 0xc000_0001;
+        assert!(!Error::from_raw_os_error(STATUS_UNSUCCESSFUL | c::FACILITY_NT_BIT as _)
+            .to_string().contains("FormatMessageW() returned error"));
+    }
+}