Generating proper tmp random dir on each test run

Cargo.lock

@@ -1433,6 +1433,7 @@ dependencies = [
  "serde_json",
  "sfw-provider-requests",
  "sphinx",
+ "tempfile",
  "tokio 0.2.10",
  "tokio-tungstenite",
  "topology",

nym-client/Cargo.toml

@@ -49,6 +49,9 @@ tokio-tungstenite = { git = "https://github.com/snapview/tokio-tungstenite", rev
 [build-dependencies]
 built = "0.3.2"
 
+[dev-dependencies]
+tempfile = "3.1.0"
+
 [features]
 qa = []
 local = []

nym-client/src/config/mod.rs

@@ -331,7 +331,7 @@ mod client_config {
 
     #[test]
     fn after_saving_default_config_the_loaded_one_is_identical() {
-        let temp_location = std::env::temp_dir().join("config.toml");
+        let temp_location = tempfile::tempdir().unwrap().path().join("config.toml");
         let default_config = Config::default().with_id("foomp".to_string());
         default_config
             .save_to_file(Some(temp_location.clone()))