diff --git a/src/fs_impl/mod.rs b/src/fs_impl/mod.rs
index b86bac9..5616739 100644
--- a/src/fs_impl/mod.rs
+++ b/src/fs_impl/mod.rs
@@ -6,6 +6,7 @@ use std::error::Error;
 use crate::lws_vfs::{Fstat, FileInfo};
 
 extern crate winapi;
+use io::Write;
 use winapi::um::winnt::{FILE_ATTRIBUTE_READONLY};
 use std::os::windows::fs::MetadataExt;
 use std::os::windows::prelude::*;
@@ -152,3 +153,44 @@ pub fn faccess(path: &String, mask: u32) -> Result<i32, Box<dyn Error>> {
     let permissions = get_file_mode_mask(path);
     Ok(if permissions & mask != 0 {0} else {-1})
 }
+
+#[test]
+fn test() {
+    use crate::fs_impl::*;
+    let path = String::from("test.txt");
+    let mut file: fs::File = fs::File::open("test.txt").unwrap();
+    let _ = file.write(b"This is a test file.\n");
+    let mut buffer = vec![0; 100];
+    let mut size = 0;
+    let mut offsize: usize = 0;
+    let mut fi = FileInfo::default();
+    size    = 4;
+    let mut buffer = vec![0; size];
+    offsize  = 5;
+    let _ = fread(&path, &mut buffer, &mut size, offsize, &mut fi);
+    assert_eq!(buffer.len(), 4);
+    assert_eq!(buffer, b"is a");
+    let result = fwrite(&path, &buffer, &mut size, offsize, &mut fi);
+    println!("result: {:?}", result);
+    println!("size: {:?}", size);
+    println!("buffer: {:?}", buffer);
+    let result = freaddir(&path, &mut vec![], 0, 0, &mut fi);
+    println!("result: {:?}", result);
+    println!("buffer: {:?}", buffer);
+    let result = fmkdir(&path, 0);
+    println!("result: {:?}", result);
+    let result = fchown(&path, 0, 0);
+    println!("result: {:?}", result);
+    let result = ftruncate(&path, 100);
+    println!("result: {:?}", result);
+    let result = futimens(&path, &vec![100, 0], &vec![100, 0]);
+    println!("result: {:?}", result);
+    let result = frelease(&path, &mut fi);
+    println!("result: {:?}", result);
+    let result = fsetxattr(&path, "test", &vec![1,2,3], 3, 0);
+    println!("result: {:?}", result);
+    let result = fgetxattr(&path, "test", 100);
+    println!("result: {:?}", result);
+    let result = faccess(&path, 0o777);
+    println!("result: {:?}", result);
+}
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