fix: Use correct PATH for npm install test (#768)

* fix: Use correct PATH for npm install test

Resolves: https://github.com/Schniz/fnm/issues/755

* Create soft-laws-doubt.md

Co-authored-by: Gal Schlezinger <gal@spitfire.co.il>

.changeset/soft-laws-doubt.md

@@ -0,0 +1,5 @@
+---
+"fnm": patch
+---
+
+fix test: Use correct PATH for npm install test

src/downloader.rs

@@ -152,13 +152,11 @@ mod tests {
     #[test_log::test]
     fn test_installing_npm() {
         let installations_dir = tempdir().unwrap();
-        let npm_path = install_in(installations_dir.path()).join(if cfg!(windows) {
-            "npm.cmd"
-        } else {
-            "npm"
-        });
+        let bin_dir = install_in(installations_dir.path());
+        let npm_path = bin_dir.join(if cfg!(windows) { "npm.cmd" } else { "npm" });
 
         let stdout = duct::cmd(npm_path.to_str().unwrap(), vec!["--version"])
+            .env("PATH", bin_dir)
             .stdout_capture()
             .run()
             .expect("Can't run npm")