1 files changed, 56 insertions, 0 deletions
diff --git a/browser/components/newtab/test/browser/browser_remote_l10n.js b/browser/components/newtab/test/browser/browser_remote_l10n.js
new file mode 100644
index 0000000000..967236a721
--- /dev/null
+++ b/browser/components/newtab/test/browser/browser_remote_l10n.js
@@ -0,0 +1,56 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { RemoteL10n } = ChromeUtils.importESModule(
+  "resource://activity-stream/lib/RemoteL10n.sys.mjs"
+);
+
+const ID = "remote_l10n_test_string";
+const VALUE = "RemoteL10n string";
+const CONTENT = `${ID} = ${VALUE}`;
+
+add_setup(async () => {
+  const l10nRegistryInstance = L10nRegistry.getInstance();
+  const localProfileDir = Services.dirsvc.get("ProfD", Ci.nsIFile).path;
+  const dirPath = PathUtils.join(
+    localProfileDir,
+    ...["settings", "main", "ms-language-packs", "browser", "newtab"]
+  );
+  const filePath = PathUtils.join(dirPath, "asrouter.ftl");
+
+  await IOUtils.makeDirectory(dirPath, {
+    ignoreExisting: true,
+    from: localProfileDir,
+  });
+  await IOUtils.writeUTF8(filePath, CONTENT, {
+    tmpPath: `${filePath}.tmp`,
+  });
+
+  // Remove any cached l10n resources, "cfr" is the cache key
+  // used for strings from the remote `asrouter.ftl` see RemoteL10n.sys.mjs
+  RemoteL10n.reloadL10n();
+  if (l10nRegistryInstance.hasSource("cfr")) {
+    l10nRegistryInstance.removeSources(["cfr"]);
+  }
+});
+
+add_task(async function test_TODO() {
+  let [{ value }] = await RemoteL10n.l10n.formatMessages([{ id: ID }]);
+
+  Assert.equal(value, VALUE, "Got back the string we wrote to disk");
+});
+
+// Test that the formatting helper works.  This helper is lower-level than the
+// DOM localization apparatus, and as such doesn't require the weight of the
+// `browser` test framework, but it's nice to co-locate related tests.
+add_task(async function test_formatLocalizableText() {
+  let value = await RemoteL10n.formatLocalizableText({ string_id: ID });
+
+  Assert.equal(value, VALUE, "Got back the string we wrote to disk");
+
+  value = await RemoteL10n.formatLocalizableText("unchanged");
+
+  Assert.equal(value, "unchanged", "Got back the string provided");
+});