add mockrepo tests

tests/profile/read_mock_profile.rs

@@ -0,0 +1,58 @@
+use std::env;
+
+use gentoo_utils::{atom::Atom, repo::Repo, useflag::UseFlag};
+use itertools::Itertools;
+
+fn main() {
+    let repo_path = env::args().nth(1).expect("expected path to mock repo");
+    let repo = Repo::new(&repo_path).expect("failed to open repo");
+    let profile = repo
+        .evaluate_profile("features/emacs/gui")
+        .expect("failed to evaluate profile");
+
+    assert_eq!(
+        profile.make_defaults()["USE"]
+            .split_ascii_whitespace()
+            .sorted()
+            .collect::<Vec<_>>(),
+        vec!["base", "emacs"]
+    );
+
+    assert_eq!(
+        profile
+            .packages()
+            .iter()
+            .map(Atom::to_string)
+            .collect::<Vec<_>>(),
+        vec!["app-editors/emacs"]
+    );
+
+    let emacs_package_use = profile
+        .package_use()
+        .iter()
+        .find_map(|(atom, flags)| {
+            if atom.clone().into_cp().to_string() == "app-editors/emacs" {
+                Some(flags)
+            } else {
+                None
+            }
+        })
+        .expect("failed to read package.use settings for app-editors/emacs");
+
+    assert_eq!(
+        emacs_package_use
+            .iter()
+            .map(UseFlag::to_string)
+            .collect::<Vec<_>>(),
+        vec!["default", "gui"]
+    );
+
+    assert_eq!(
+        profile
+            .use_force()
+            .iter()
+            .map(UseFlag::to_string)
+            .collect::<Vec<_>>(),
+        vec!["default", "gui"]
+    );
+}