unit test for Emulatedfile (#244)

- included additional unit tests for file

Signed-off-by: naveensrinivasan <[email protected]>

Author: naveensrinivasan

.gitignore

@@ -20,3 +20,5 @@ linddata*
 gen_netdevs
 lind.metadata
 lind.md.log
+test_file.txt
+

src/interface/file.rs

@@ -478,4 +478,60 @@ mod tests {
         let non_existent_file = "/tmp/non_existent_file.txt";
         assert!(!pathexists(non_existent_file.to_string()));
     }
+    #[test]
+    fn test_new_emulated_file() {
+        let filename = "test_file.txt";
+        let filesize = 1024;
+
+        let emulated_file = EmulatedFile::new(filename.to_string(), filesize).unwrap();
+
+        assert_eq!(emulated_file.filename, filename);
+        assert_eq!(emulated_file.filesize, filesize);
+        assert!(emulated_file.fobj.is_some());
+    }
+
+    #[test]
+    fn test_new_metadata_emulated_file() {
+        let temp_file = NamedTempFile::new().unwrap();
+        let file_path = temp_file.path().to_str().unwrap().to_string();
+
+        let emulated_file = EmulatedFile::new_metadata(file_path.clone()).unwrap();
+
+        assert_eq!(emulated_file.filename, file_path);
+        assert!(emulated_file.fobj.is_some());
+    }
+    #[test]
+    fn test_readat_emulated_file() {
+        let temp_file = NamedTempFile::new().unwrap();
+        let file_path = temp_file.path().to_str().unwrap().to_string();
+        let file_content = b"Hello, world!";
+        temp_file.as_file().write_all(file_content).unwrap();
+
+        let emulated_file = EmulatedFile::new(file_path.clone(), file_content.len()).unwrap();
+
+        let mut buffer = vec![0; file_content.len()];
+        let bytes_read = emulated_file.readat(buffer.as_mut_ptr(), buffer.len(), 0).unwrap();
+
+        assert_eq!(bytes_read, file_content.len());
+        assert_eq!(buffer, file_content);
+    }
+
+    #[test]
+    fn test_writeat_emulated_file() {
+        let temp_file = NamedTempFile::new().unwrap();
+        let file_path = temp_file.path().to_str().unwrap().to_string();
+        let file_content = b"Hello, world!";
+
+        let mut emulated_file = EmulatedFile::new(file_path.clone(), file_content.len()).unwrap();
+
+        let new_content = b"test_writeat_emulated_file, world!";
+        let bytes_written = emulated_file.writeat(new_content.as_ptr(), new_content.len(), 0).unwrap();
+
+        assert_eq!(bytes_written, new_content.len());
+        assert_eq!(emulated_file.filesize, new_content.len());
+
+        let mut buffer = vec![0; new_content.len()];
+        emulated_file.readat(buffer.as_mut_ptr(), buffer.len(), 0).unwrap();
+        assert_eq!(buffer, new_content);
+    }
 }