yarn test-electron: automatically pick up test files

ts/test-node/util/sortByTitle_test.ts

@@ -0,0 +1,29 @@
+// Copyright 2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { sortByTitle } from '../../util/sortByTitle';
+
+describe('sortByTitle', () => {
+  it("does nothing to arrays that don't need to be sorted", () => {
+    assert.deepEqual(sortByTitle([]), []);
+
+    assert.deepEqual(sortByTitle([{ title: 'foo' }]), [{ title: 'foo' }]);
+  });
+
+  it('sorts the array by title', () => {
+    // Because the function relies on locale-aware comparisons, we don't have very
+    //   thorough tests here, as it can change based on platform.
+    assert.deepEqual(sortByTitle([{ title: 'foo' }, { title: 'bar' }]), [
+      { title: 'bar' },
+      { title: 'foo' },
+    ]);
+  });
+
+  it("doesn't mutate its argument", () => {
+    const arr = [{ title: 'foo' }, { title: 'bar' }];
+    sortByTitle(arr);
+    assert.deepEqual(arr, [{ title: 'foo' }, { title: 'bar' }]);
+  });
+});