Cache config as a file

wasmtime-environ/tests/cache_fail_calling_init_twice.rs

@@ -1,10 +1,26 @@
+use std::fs;
 use tempfile;
-use wasmtime_environ::cache_conf;
+use wasmtime_environ::cache_config;
 
 #[test]
 #[should_panic]
-fn test_fail_calling_init_twice() {
+fn test_cache_fail_calling_init_twice() {
     let dir = tempfile::tempdir().expect("Can't create temporary directory");
-    cache_conf::init(true, Some(dir.path()), Some(5));
-    cache_conf::init(true, Some(dir.path()), Some(5));
+    let cache_dir = dir.path().join("cache-dir");
+    let baseline_compression_level = 5;
+
+    let config_path = dir.path().join("cache-config.toml");
+    let config_content = format!(
+        "[cache]\n\
+         enabled = true\n\
+         directory = {}\n\
+         baseline-compression-level = {}\n",
+        toml::to_string_pretty(&format!("{}", cache_dir.display())).unwrap(),
+        baseline_compression_level,
+    );
+    fs::write(&config_path, config_content).expect("Failed to write test config file");
+
+    let errors = cache_config::init(true, Some(&config_path), false);
+    assert!(errors.is_empty());
+    let _errors = cache_config::init(true, Some(&config_path), false);
 }