A confirming test (should revert after test passed)

crates/uv-cache/src/cli.rs

@@ -1,4 +1,3 @@
-use std::ffi::c_float;
 use std::io;
 use std::path::{Path, PathBuf};
 

crates/uv-tool/Cargo.toml

@@ -33,3 +33,7 @@ thiserror = { workspace = true }
 toml = { workspace = true }
 toml_edit = { workspace = true }
 tracing = { workspace = true }
+
+[dev-dependencies]
+directories = "5.0.1"
+dirs-sys = "0.4.1"

crates/uv-tool/src/lib.rs

@@ -458,3 +458,85 @@ pub fn entrypoint_paths(
 
     Ok(entrypoints)
 }
+
+#[cfg(test)]
+mod tests {
+    use etcetera::BaseStrategy;
+    use std::path::PathBuf;
+
+    fn dirs_before() -> (PathBuf, PathBuf, PathBuf, PathBuf) {
+        let data_dir = directories::ProjectDirs::from("", "", "uv")
+            .unwrap()
+            .data_dir()
+            .to_path_buf();
+
+        let cache_dir = directories::ProjectDirs::from("", "", "uv")
+            .unwrap()
+            .cache_dir()
+            .to_path_buf();
+
+        let config_dir = {
+            // On Windows, use, e.g., C:\Users\Alice\AppData\Roaming
+            #[cfg(windows)]
+            {
+                dirs_sys::known_folder_roaming_app_data()
+            }
+            // On Linux and macOS, use, e.g., /home/alice/.config.
+            #[cfg(not(windows))]
+            {
+                std::env::var_os("XDG_CONFIG_HOME")
+                    .and_then(dirs_sys::is_absolute_path)
+                    .or_else(|| dirs_sys::home_dir().map(|path| path.join(".config")))
+            }
+        };
+
+        let home_dir = {
+            #[cfg(windows)]
+            {
+                dirs_sys::known_folder_profile()
+            }
+            #[cfg(not(windows))]
+            {
+                dirs_sys::home_dir()
+            }
+        };
+
+        (data_dir, cache_dir, config_dir.unwrap(), home_dir.unwrap())
+    }
+
+    fn dirs_after() -> (PathBuf, PathBuf, PathBuf, PathBuf) {
+        let data_dir = etcetera::base_strategy::choose_native_strategy()
+            .unwrap()
+            .data_dir()
+            .join("uv");
+        let data_dir = if cfg!(windows) {
+            data_dir.join("data")
+        } else {
+            data_dir
+        };
+
+        let cache_dir = etcetera::base_strategy::choose_native_strategy()
+            .unwrap()
+            .cache_dir()
+            .join("uv");
+        let cache_dir = if cfg!(windows) {
+            cache_dir.join("cache")
+        } else {
+            cache_dir
+        };
+
+        let config_dir = etcetera::base_strategy::choose_base_strategy()
+            .unwrap()
+            .config_dir();
+        let home_dir = etcetera::home_dir().unwrap();
+
+        (data_dir, cache_dir, config_dir, home_dir)
+    }
+
+    #[test]
+    fn ensure_directory_not_changed() {
+        let before = dirs_before();
+        let after = dirs_after();
+        assert_eq!(before, after);
+    }
+}