Simplify spellcheck download URL, disable spellcheck in most windows

ts/test-node/app/updateDefaultSession_test.ts

@@ -0,0 +1,33 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import * as sinon from 'sinon';
+import { session } from 'electron';
+import { v4 as uuid } from 'uuid';
+
+import { updateDefaultSession } from '../../../app/updateDefaultSession';
+
+describe('updateDefaultSession', () => {
+  let sandbox: sinon.SinonSandbox;
+
+  beforeEach(() => {
+    sandbox = sinon.createSandbox();
+  });
+
+  afterEach(() => {
+    sandbox.restore();
+  });
+
+  it('sets the spellcheck URL', () => {
+    const sesh = session.fromPartition(uuid());
+    const stub = sandbox.stub(sesh, 'setSpellCheckerDictionaryDownloadURL');
+
+    updateDefaultSession(sesh);
+
+    sinon.assert.calledOnce(stub);
+    sinon.assert.calledWith(
+      stub,
+      `https://updates.signal.org/desktop/hunspell_dictionaries/${process.versions.electron}/`
+    );
+  });
+});