diff --git a/wfassoc/tests/extra/windows.rs b/wfassoc/tests/extra/windows.rs
new file mode 100644
index 0000000..e69de29
diff --git a/wfassoc/tests/extra_windows.rs b/wfassoc/tests/extra_windows.rs
new file mode 100644
index 0000000..50acf2e
--- /dev/null
+++ b/wfassoc/tests/extra_windows.rs
@@ -0,0 +1,67 @@
+use wfassoc::extra::windows::*;
+
+fn test_cmd_args_ex(s: &str, probe: &[&'static str]) {
+    let rv = CmdArgs::new(s);
+    let inner = rv.get_inner();
+    assert_eq!(inner.len(), probe.len());
+
+    let n = inner.len();
+    for i in 0..n {
+        assert_eq!(inner[i].get_inner(), probe[i]);
+    }
+}
+
+#[test]
+fn test_cmd_args() {
+    // Normal cases
+    test_cmd_args_ex(
+        "MyApp.exe --config ppic.toml",
+        &["MyApp.exe", "--config", "ppic.toml"],
+    );
+    test_cmd_args_ex(
+        r#""C:\Program Files\MyApp\MyApp.exe" --config ppic.toml"#,
+        &[
+            r#"C:\Program Files\MyApp\MyApp.exe"#,
+            "--config",
+            "ppic.toml",
+        ],
+    );
+
+    // Microsoft shitty cases.
+    test_cmd_args_ex(r#""abc" d e"#, &[r#"abc"#, r#"d"#, r#"e"#]);
+    test_cmd_args_ex(r#"a\\b d"e f"g h"#, &[r#"a\\b"#, r#"de fg"#, r#"h"#]);
+    test_cmd_args_ex(r#"a\\\"b c d"#, &[r#"a\"b"#, r#"c"#, r#"d"#]);
+    test_cmd_args_ex(r#"a\\\\"b c" d e"#, &[r#"a\\b c"#, r#"d"#, r#"e"#]);
+    test_cmd_args_ex(r#"a"b"" c d"#, &[r#"ab" c d"#]);
+}
+
+#[test]
+fn test_cmd_arg() {
+    let rv = CmdArg::new(r#""C:\Program Files\MyApp\MyApp.exe""#);
+    assert!(rv.is_ok());
+    assert_eq!(rv.unwrap().get_inner(), r#"C:\Program Files\MyApp\MyApp.exe"#);
+
+    let rv = CmdArg::new("MyApp.exe --config ppic.toml");
+    assert!(rv.is_err());
+
+    let rv = CmdArg::new("");
+    assert!(rv.is_err());
+}
+
+#[test]
+fn test_quote_cmd_arg() {
+    let rv = CmdArg::with_inner(r#"C:\Program Files\MyApp\MyApp.exe"#).to_quoted_string(true);
+    assert_eq!(rv, r#""C:\Program Files\MyApp\MyApp.exe""#)
+}
+
+#[test]
+fn test_quote_cmd_args() {
+    let args = [
+        r#"C:\Program Files\MyApp\MyApp.exe"#,
+        "--config",
+        "ppic.toml",
+    ];
+    let rv = CmdArgs::with_inner(args.iter().map(|s| CmdArg::with_inner(s))).to_quoted_string();
+    assert_eq!(rv, r#""C:\Program Files\MyApp\MyApp.exe" --config ppic.toml"#);
+}
+