1 files changed, 58 insertions, 0 deletions
diff --git a/intl/l10n/rust/gtest/test.rs b/intl/l10n/rust/gtest/test.rs
new file mode 100644
index 0000000000..3e993f4789
--- /dev/null
+++ b/intl/l10n/rust/gtest/test.rs
@@ -0,0 +1,58 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use l10nregistry_ffi::load::{load_async, load_sync};
+use moz_task;
+use std::borrow::Borrow;
+
+// We want to test a file that ships in every platform configuration, so we take
+// something from `toolkit/`.  But we don't want to depend on the specifics of
+// the text, or the packaging of that text, since those can change.  It would be
+// best to register an untranslated `.ftl` for this test, but that's difficult.
+// Second best is to ship an untranslated `.ftl`, but that is not well-supported
+// by existing processes either.  So we settle for depending on the form of
+// specific identifiers, whose names will appear in future searches, while
+// depending on the specific messages or the file packaging.
+fn assert_about_about_correct<T: Borrow<[u8]>> (res: T) {
+    assert!(res.borrow().len() > 0);
+
+    // `windows` is a convenient, if inefficient, way to look for a subslice.
+    let needle = b"about-about-title";
+    assert!(res.borrow().windows(needle.len()).position(|window| window == needle).is_some());
+
+    let needle = b"about-about-note";
+    assert!(res.borrow().windows(needle.len()).position(|window| window == needle).is_some());
+}
+
+#[no_mangle]
+pub extern "C" fn Rust_L10NLoadAsync(it_worked: *mut bool) {
+    let future = async move {
+        match load_async("resource://gre/localization/en-US/toolkit/about/aboutAbout.ftl").await {
+            Ok(res) => {
+                assert_about_about_correct(res);
+                unsafe {
+                    *it_worked = true;
+                }
+            }
+            Err(err) => panic!("{:?}", err),
+        }
+    };
+
+    unsafe {
+        moz_task::gtest_only::spin_event_loop_until("Rust_L10NLoadAsync", future).unwrap();
+    }
+}
+
+#[no_mangle]
+pub extern "C" fn Rust_L10NLoadSync(it_worked: *mut bool) {
+    match load_sync("resource://gre/localization/en-US/toolkit/about/aboutAbout.ftl") {
+        Ok(res) => {
+            assert_about_about_correct(res);
+            unsafe {
+                *it_worked = true;
+            }
+        }
+        Err(err) => panic!("{:?}", err),
+    }
+}