windows: Fix tests on Windows (#22616)

Release Notes:

- N/A

---------

Co-authored-by: Mikayla <mikayla.c.maki@gmail.com>

crates/util_macros/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "util_macros"
+version = "0.1.0"
+edition.workspace = true
+publish.workspace = true
+license = "GPL-3.0-or-later"
+
+[lints]
+workspace = true
+
+[lib]
+path = "src/util_macros.rs"
+proc-macro = true
+doctest = false
+
+[dependencies]
+quote.workspace = true
+syn.workspace = true

crates/util_macros/LICENSE-APACHE

@@ -0,0 +1 @@
+../../LICENSE-APACHE

crates/util_macros/src/util_macros.rs

@@ -0,0 +1,56 @@
+#![cfg_attr(not(target_os = "windows"), allow(unused))]
+
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::{parse_macro_input, LitStr};
+
+/// This macro replaces the path separator `/` with `\` for Windows.
+/// But if the target OS is not Windows, the path is returned as is.
+///
+/// # Example
+/// ```rust
+/// # use util_macros::separator;
+/// let path = separator!("path/to/file");
+/// #[cfg(target_os = "windows")]
+/// assert_eq!(path, "path\\to\\file");
+/// #[cfg(not(target_os = "windows"))]
+/// assert_eq!(path, "path/to/file");
+/// ```
+#[proc_macro]
+pub fn separator(input: TokenStream) -> TokenStream {
+    let path = parse_macro_input!(input as LitStr);
+    let path = path.value();
+
+    #[cfg(target_os = "windows")]
+    let path = path.replace("/", "\\");
+
+    TokenStream::from(quote! {
+        #path
+    })
+}
+
+/// This macro replaces the path prefix `file:///` with `file:///C:/` for Windows.
+/// But if the target OS is not Windows, the URI is returned as is.
+///
+/// # Example
+/// ```rust
+/// use util_macros::uri;
+///
+/// let uri = uri!("file:///path/to/file");
+/// #[cfg(target_os = "windows")]
+/// assert_eq!(uri, "file:///C:/path/to/file");
+/// #[cfg(not(target_os = "windows"))]
+/// assert_eq!(uri, "file:///path/to/file");
+/// ```
+#[proc_macro]
+pub fn uri(input: TokenStream) -> TokenStream {
+    let uri = parse_macro_input!(input as LitStr);
+    let uri = uri.value();
+
+    #[cfg(target_os = "windows")]
+    let uri = uri.replace("file:///", "file:///C:/");
+
+    TokenStream::from(quote! {
+        #uri
+    })
+}