message: Also test LastMod for deleted elements - was previously broken.
diff: @@ -212,13 +212,16 @@ describe("TxnManager", () => {
  const lastMod2 = models.queryLastModifiedTime(modelId);
  assert.notEqual(lastMod, lastMod2);
  - // Deleting a geometric element updates model's GeometryGuid
  + // Deleting a geometric element updates model's GeometryGuid; deleting any element updates model's LastMod.
  + await pause(300); // for lastMod...
  const guid4 = model.geometryGuid;
  toModify.delete();
  imodel.saveChanges("save deletion of element");
  assert.throws(() => elements.getElement(modifyId));
  model = models.getModel(modelId);
  expect(model.geometryGuid).not.to.equal(guid4);
  + const lastMod3 = models.queryLastModifiedTime(modelId);
  + expect(lastMod3).not.to.equal(lastMod2);
  });
  it("Element drives element events", async () => {
  