1 files changed, 16 insertions, 0 deletions
diff --git a/toolkit/components/uniffi-bindgen-gecko-js/fixtures/tests/xpcshell/test_external_types.js b/toolkit/components/uniffi-bindgen-gecko-js/fixtures/tests/xpcshell/test_external_types.js
new file mode 100644
index 0000000000..e2f985cde7
--- /dev/null
+++ b/toolkit/components/uniffi-bindgen-gecko-js/fixtures/tests/xpcshell/test_external_types.js
@@ -0,0 +1,16 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const ExternalTypes = ChromeUtils.importESModule(
+  "resource://gre/modules/RustExternalTypes.sys.mjs"
+);
+
+add_task(async function () {
+  const line = new ExternalTypes.Line(
+    new ExternalTypes.Point(0, 0, "p1"),
+    new ExternalTypes.Point(2, 1, "p2")
+  );
+  Assert.equal(await ExternalTypes.gradient(line), 0.5);
+
+  Assert.equal(await ExternalTypes.gradient(null), 0.0);
+});