1 files changed, 81 insertions, 0 deletions
diff --git a/toolkit/components/translations/tests/browser/browser_translations_actor_versioning.js b/toolkit/components/translations/tests/browser/browser_translations_actor_versioning.js
new file mode 100644
index 0000000000..7e96f62fbf
--- /dev/null
+++ b/toolkit/components/translations/tests/browser/browser_translations_actor_versioning.js
@@ -0,0 +1,81 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_remote_settings_versioning() {
+  const tests = [
+    {
+      majorVersion: 1,
+      existingVersion: "1.0",
+      nextVersion: "1.1",
+      expectation: true,
+    },
+    {
+      majorVersion: 1,
+      existingVersion: null,
+      nextVersion: "1.1",
+      expectation: true,
+    },
+    {
+      majorVersion: 1,
+      existingVersion: null,
+      nextVersion: "1.0beta",
+      expectation: true,
+    },
+    {
+      majorVersion: 1,
+      existingVersion: null,
+      nextVersion: "1.0a",
+      expectation: true,
+    },
+    {
+      majorVersion: 2,
+      existingVersion: null,
+      nextVersion: "1.0a",
+      expectation: false,
+    },
+    {
+      majorVersion: 2,
+      existingVersion: "2.0",
+      nextVersion: "1.0a",
+      expectation: false,
+    },
+    {
+      majorVersion: 2,
+      existingVersion: "2.1",
+      nextVersion: "3.2",
+      expectation: false,
+    },
+    {
+      majorVersion: 2,
+      existingVersion: null,
+      nextVersion: "3.2",
+      expectation: false,
+    },
+    {
+      majorVersion: 1,
+      nextVersion: "1.0",
+      existingVersion: undefined,
+      expectation: true,
+    },
+  ];
+  for (const {
+    majorVersion,
+    existingVersion,
+    nextVersion,
+    expectation,
+  } of tests) {
+    is(
+      TranslationsParent.isBetterRecordVersion(
+        majorVersion,
+        nextVersion,
+        existingVersion
+      ),
+      expectation,
+      `Given a major version of ${majorVersion}, an existing version ${existingVersion} ` +
+        `and a next version of ${nextVersion}, is the next version is ` +
+        `${expectation ? "" : "not "}best.`
+    );
+  }
+});