on Windows, remove UNC prefix

Author: sunshowers

Cargo.lock

@@ -91,6 +91,7 @@ windows = { version = "0.42.0", features = [
     "Win32_System_JobObjects",
 ] }
 win32job = "1.0.2"
+dunce = "1.0.3"
 
 [dev-dependencies]
 color-eyre = { version = "0.6.2", default-features = false }

nextest-runner/Cargo.toml

@@ -548,7 +548,24 @@ pub(crate) fn relative_dir_for(config_path: &Utf8Path) -> Option<&Utf8Path> {
     // Need to call parent() twice here, since in Cargo land relative means relative to the *parent*
     // of the directory the config is in. First parent() gets the directory the config is in, and
     // the second one gets the parent of that.
-    config_path.parent()?.parent()
+    let relative_dir = config_path.parent()?.parent()?;
+
+    // On Windows, remove the UNC prefix since Cargo does so as well.
+    Some(strip_unc_prefix(relative_dir))
+}
+
+#[cfg(windows)]
+#[inline]
+fn strip_unc_prefix(path: &Utf8Path) -> &Utf8Path {
+    dunce::simplified(path.as_std_path())
+        .try_into()
+        .expect("stripping verbatim components from a UTF-8 path should result in a UTF-8 path")
+}
+
+#[cfg(not(windows))]
+#[inline]
+fn strip_unc_prefix(path: &Utf8Path) -> &Utf8Path {
+    path
 }
 
 #[derive(Clone, Deserialize, Debug)]