Add config unit tests

tests/config.rs

@@ -1,20 +1,76 @@
-use std::env;
+use std::{env, path::PathBuf};
 
 use sandkasten::config;
 
 #[test]
-fn test_config() {
+fn valid() {
     env::set_var("NSJAIL_PATH", "/");
     env::set_var("TIME_PATH", "/");
     env::set_var(
         "CONFIG_PATH",
         concat!(env!("CARGO_MANIFEST_DIR"), "/config.toml"),
     );
-    config::load().unwrap();
+    let conf = config::load().unwrap();
+    assert_eq!(conf.nsjail_path, PathBuf::from("/"));
+    assert_eq!(conf.time_path, PathBuf::from("/"));
+}
 
+#[test]
+fn invalid() {
     env::set_var(
         "CONFIG_PATH",
         concat!(env!("CARGO_MANIFEST_DIR"), "/Cargo.toml"),
     );
     assert!(config::load().is_err());
 }
+
+#[test]
+fn not_found() {
+    env::set_var("CONFIG_PATH", "/does/not/exist.toml");
+    assert!(config::load().is_err());
+}
+
+#[test]
+fn cannot_canonicalize() {
+    env::set_var("NSJAIL_PATH", "./does/not/exist");
+    env::set_var("TIME_PATH", "/");
+    env::set_var(
+        "CONFIG_PATH",
+        concat!(env!("CARGO_MANIFEST_DIR"), "/config.toml"),
+    );
+    let err = config::load().unwrap_err();
+    assert!(err
+        .to_string()
+        .starts_with("Failed to resolve `nsjail_path`"));
+
+    env::set_var("NSJAIL_PATH", "/");
+    env::set_var("TIME_PATH", "./does/not/exist");
+    env::set_var(
+        "CONFIG_PATH",
+        concat!(env!("CARGO_MANIFEST_DIR"), "/config.toml"),
+    );
+    let err = config::load().unwrap_err();
+    assert!(err.to_string().starts_with("Failed to resolve `time_path`"));
+}
+
+#[test]
+fn environments_path_from_env() {
+    env::set_var("NSJAIL_PATH", "/");
+    env::set_var("TIME_PATH", "/");
+    env::set_var("ENVIRONMENTS_PATH", "/foo:/bar:/baz");
+    env::set_var(
+        "CONFIG_PATH",
+        concat!(env!("CARGO_MANIFEST_DIR"), "/config.toml"),
+    );
+    let conf = config::load().unwrap();
+    assert_eq!(conf.nsjail_path, PathBuf::from("/"));
+    assert_eq!(conf.time_path, PathBuf::from("/"));
+    assert_eq!(
+        conf.environments_path,
+        [
+            PathBuf::from("/foo"),
+            PathBuf::from("/bar"),
+            PathBuf::from("/baz"),
+        ]
+    );
+}