Implement ostree::checksum_file

rust-bindings/rust/tests/functions/mod.rs

@@ -0,0 +1,21 @@
+use gio::NONE_CANCELLABLE;
+use glib::Cast;
+use ostree::{checksum_file, ObjectType, RepoFile, RepoFileExt};
+use util::TestRepo;
+
+#[test]
+fn should_checksum_file() {
+    let repo = TestRepo::new();
+    repo.test_commit("test");
+
+    let file = repo
+        .repo
+        .read_commit("test", NONE_CANCELLABLE)
+        .expect("read commit")
+        .0
+        .downcast::<RepoFile>()
+        .expect("downcast");
+    let result = checksum_file(&file, ObjectType::File, NONE_CANCELLABLE).expect("checksum file");
+
+    assert_eq!(file.get_checksum().unwrap(), result.to_string());
+}