Cache config as a file

wasmtime-environ/tests/cache_fail_usage_without_init.rs

@@ -1,7 +1,15 @@
-use wasmtime_environ::cache_conf;
+// These tests doesn't call init(), so we can test a multiple certain things here
+
+use wasmtime_environ::cache_config;
 
 #[test]
 #[should_panic]
-fn test_fail_usage_without_init() {
-    let _ = cache_conf::cache_directory();
+fn test_cache_fail_usage_without_init_directory() {
+    let _ = cache_config::directory();
+}
+
+#[test]
+#[should_panic]
+fn test_cache_fail_usage_without_init_baseline_compression_level() {
+    let _ = cache_config::baseline_compression_level();
 }