added tests for parsing root config

tests/data/root_config_complex.toml

@@ -0,0 +1,21 @@
+mod_location = "mods"
+download_location = "downloads"
+nexus_api_key = "1234"
+
+[games.sse]
+path = "/home/user/games/sse"
+
+[instances.example1]
+path = "example1.toml"
+
+[instances.example2]
+path = "/home/user/example2.toml"
+
+[mods.mod1]
+path = "/home/user/mods/mod1"
+
+[mods."mod2"]
+path = "mod2"
+
+[mods.mod3]
+path = "mods3"

tests/data/root_config_minimal.toml

@@ -0,0 +1 @@
+mod_location = "mods"

tests/root_config_test.rs

@@ -0,0 +1,51 @@
+use std::path::PathBuf;
+
+use fomod_manager::types::RootConfig;
+
+fn get_parent() -> PathBuf {
+    PathBuf::from(file!()).parent().unwrap().to_owned()
+}
+
+#[test]
+fn parse_minimal() {
+    let config =
+        RootConfig::load_from_file(get_parent().join("data/root_config_minimal.toml")).unwrap();
+
+    assert!(config.mod_location().ends_with("mods"));
+    assert!(
+        config.download_location().is_none(),
+        "Download location should be None"
+    );
+    assert!(config.nexus_api_key().is_none());
+}
+
+#[test]
+fn parse_complex() {
+    let config =
+        RootConfig::load_from_file(get_parent().join("data/root_config_complex.toml")).unwrap();
+
+    assert!(config.mod_location().ends_with("mods"));
+    assert!(
+        config
+            .download_location()
+            .is_some_and(|e| e.ends_with("downloads"))
+    );
+    assert_eq!(config.nexus_api_key(), Some("1234"));
+
+    assert!(
+        config
+            .game_by_id("sse")
+            .is_some_and(|e| e.install_location() == "/home/user/games/sse"),
+        "Installed game wrong path"
+    );
+
+    assert!(config.game_by_id("starfield").is_none());
+
+    assert!(config.mod_by_id("mod1").is_some());
+    assert!(config.mod_by_id("mod100").is_none());
+    assert!(
+        config
+            .mod_by_id("mod1")
+            .is_some_and(|e| e.path().ends_with("mods/mod1"))
+    );
+}