Add logging for deleted prekeys and other records

Co-authored-by: Scott Nonnenberg <scott@signal.org>

ts/test-node/util/groupBy_test.ts

@@ -0,0 +1,63 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+import { groupWhile, formatGroups } from '../../util/groupWhile';
+
+describe('groupWhile/formatGroups', () => {
+  function check(
+    input: Array<number>,
+    expected: Array<Array<number>>,
+    expectedFormatted: string
+  ) {
+    const result = groupWhile(input, (item, prev) => {
+      return prev + 1 === item;
+    });
+    assert.deepEqual(result, expected);
+    const formatted = formatGroups(result, '-', ', ', String);
+    assert.equal(formatted, expectedFormatted);
+  }
+
+  it('empty', () => {
+    check([], [], '');
+  });
+
+  it('one', () => {
+    check([1], [[1]], '1');
+  });
+
+  it('sequential', () => {
+    check([1, 2, 3, 4, 5, 6], [[1, 2, 3, 4, 5, 6]], '1-6');
+  });
+
+  it('non-sequential', () => {
+    check(
+      [1, 2, 4, 5],
+      [
+        [1, 2],
+        [4, 5],
+      ],
+      '1-2, 4-5'
+    );
+  });
+
+  it('multiple non-sequential', () => {
+    check(
+      [1, 2, 4, 5, 7, 9, 10],
+      [[1, 2], [4, 5], [7], [9, 10]],
+      '1-2, 4-5, 7, 9-10'
+    );
+  });
+
+  function range(start: number, end: number) {
+    return Array.from({ length: end - start + 1 }, (_, index) => start + index);
+  }
+
+  it('huge', () => {
+    check(
+      [...range(1, 100), ...range(102, 200), ...range(202, 300)],
+      [range(1, 100), range(102, 200), range(202, 300)],
+      '1-100, 102-200, 202-300'
+    );
+  });
+});