tests: use tempfile instead of the current working directory

Author: mr-c

tests/test_comparator.rs

@@ -16,7 +16,11 @@ type CompareFn = dyn Fn(&[u8], &[u8]) -> Ordering;
 pub fn write_to_db_with_comparator(compare_fn: Box<CompareFn>) -> Vec<String> {
     let mut result_vec = Vec::new();
 
-    let path = "_path_for_rocksdb_storage";
+    let tempdir = tempfile::Builder::new()
+        .prefix("_path_for_rocksdb_storage")
+        .tempdir()
+        .expect("Failed to create temporary path for the _path_for_rocksdb_storage");
+    let path = tempdir.path();
     {
         let mut db_opts = Options::default();
 

tests/test_merge_operator.rs

@@ -296,7 +296,11 @@ fn make_merge_max_with_limit(limit: u64) -> impl MergeFn + Clone {
 #[test]
 fn test_merge_state() {
     use {Options, DB};
-    let path = "_rust_rocksdb_merge_test_state";
+    let tempdir = tempfile::Builder::new()
+        .prefix("_rust_rocksdb_merge_test_state")
+        .tempdir()
+        .expect("Failed to create temporary path for the _rust_rocksdb_merge_test_state.");
+    let path = tempdir.path();
     let mut opts = Options::default();
     opts.create_if_missing(true);
     opts.set_merge_operator_associative("max-limit-12", make_merge_max_with_limit(12));