diff --git a/src/json-crdt-extensions/peritext/slice/PersistedSlice.ts b/src/json-crdt-extensions/peritext/slice/PersistedSlice.ts
index 295bb98716..4f7a1ac4e2 100644
--- a/src/json-crdt-extensions/peritext/slice/PersistedSlice.ts
+++ b/src/json-crdt-extensions/peritext/slice/PersistedSlice.ts
@@ -62,11 +62,6 @@ export class PersistedSlice<T = string> extends Range<T> implements MutableSlice
     return this.behavior === SliceBehavior.Split;
   }
 
-  protected tagNode(): JsonNode | undefined {
-    // TODO: Normalize `.get()` and `.getNode()` methods across VecNode and ArrNode.
-    return this.tuple.get(3);
-  }
-
   protected tupleApi() {
     return this.txt.model.api.wrap(this.tuple);
   }
@@ -109,7 +104,7 @@ export class PersistedSlice<T = string> extends Range<T> implements MutableSlice
   }
 
   public data(): unknown | undefined {
-    return this.tuple.get(4)?.view();
+    return this.tuple.get(SliceTupleIndex.Data)?.view();
   }
 
   public dataNode() {
diff --git a/src/json-crdt-extensions/peritext/slice/Slices.ts b/src/json-crdt-extensions/peritext/slice/Slices.ts
index e46d830164..7ab183ae73 100644
--- a/src/json-crdt-extensions/peritext/slice/Slices.ts
+++ b/src/json-crdt-extensions/peritext/slice/Slices.ts
@@ -98,6 +98,7 @@ export class Slices implements Stateful, Printable {
   }
 
   public del(id: ITimestampStruct): void {
+    this.list.del(id);
     const api = this.txt.model.api;
     api.builder.del(this.set.id, [tss(id.sid, id.time, 1)]);
     api.apply();
diff --git a/src/json-crdt-extensions/peritext/slice/__tests__/PersistedSlice.spec.ts b/src/json-crdt-extensions/peritext/slice/__tests__/PersistedSlice.spec.ts
new file mode 100644
index 0000000000..7d595dd708
--- /dev/null
+++ b/src/json-crdt-extensions/peritext/slice/__tests__/PersistedSlice.spec.ts
@@ -0,0 +1,76 @@
+import {SliceBehavior} from '../constants';
+import {setup} from './setup';
+
+const setupSlice = () => {
+  const deps = setup();
+  const range = deps.peritext.rangeAt(2, 3);
+  const slice = deps.peritext.slices.insSplit(range, 0);
+  return {...deps, range, slice};
+};
+
+test('can read slice data', () => {
+  const {range, slice} = setupSlice();
+  expect(slice.isSplit()).toBe(true);
+  expect(slice.behavior).toBe(SliceBehavior.Split);
+  expect(slice.type).toBe(0);
+  expect(slice.data()).toBe(undefined);
+  expect(slice.start).not.toBe(range.start);
+  expect(slice.start.cmp(range.start)).toBe(0);
+  expect(slice.end).not.toBe(range.end);
+  expect(slice.end.cmp(range.end)).toBe(0);
+});
+
+describe('.update()', () => {
+  const testUpdate = (name: string, update: (deps: ReturnType<typeof setupSlice>) => void) => {
+    test('can update: ' + name, () => {
+      const deps = setupSlice();
+      const {slice} = deps;
+      const hash1 = slice.refresh();
+      const hash2 = slice.refresh();
+      expect(hash1).toBe(hash2);
+      update(deps);
+      const hash3 = slice.refresh();
+      expect(hash3).not.toBe(hash2);
+    });
+  };
+
+  testUpdate('behavior', ({slice}) => {
+    slice.update({behavior: SliceBehavior.Erase});
+    expect(slice.behavior).toBe(SliceBehavior.Erase);
+  });
+
+  testUpdate('type', ({slice}) => {
+    slice.update({type: 1});
+    expect(slice.type).toBe(1);
+  });
+
+  testUpdate('data', ({slice}) => {
+    slice.update({data: 123});
+    expect(slice.data()).toBe(123);
+  });
+
+  testUpdate('range', ({peritext, slice}) => {
+    const range2 = peritext.rangeAt(0, 1);
+    slice.update({range: range2});
+    expect(slice.cmp(range2)).toBe(0);
+  });
+});
+
+describe('.del() and .isDel()', () => {
+  test('can delete a slice', () => {
+    const {peritext, slice} = setupSlice();
+    expect(peritext.model.view().slices.length).toBe(1);
+    expect(slice.isDel()).toBe(false);
+    const slice2 = peritext.slices.get(slice.id)!;
+    expect(peritext.model.view().slices.length).toBe(1);
+    expect(slice2.isDel()).toBe(false);
+    expect(slice2).toBe(slice);
+    slice.del();
+    expect(peritext.model.view().slices.length).toBe(0);
+    expect(slice.isDel()).toBe(true);
+    expect(slice2.isDel()).toBe(true);
+    const slice3 = peritext.slices.get(slice.id);
+    expect(slice3).toBe(undefined);
+  });
+});
+
diff --git a/src/json-crdt-extensions/peritext/slice/__tests__/Slices.spec.ts b/src/json-crdt-extensions/peritext/slice/__tests__/Slices.spec.ts
index 27f21fa7eb..7144ef64c1 100644
--- a/src/json-crdt-extensions/peritext/slice/__tests__/Slices.spec.ts
+++ b/src/json-crdt-extensions/peritext/slice/__tests__/Slices.spec.ts
@@ -1,31 +1,10 @@
-import {Model, ObjApi} from '../../../../json-crdt/model';
+import {Model} from '../../../../json-crdt/model';
 import {Peritext} from '../../Peritext';
 import {Range} from '../../rga/Range';
 import {Anchor} from '../../rga/constants';
 import {PersistedSlice} from '../PersistedSlice';
 import {SliceBehavior} from '../constants';
-
-const setup = () => {
-  const model = Model.withLogicalClock(12345678);
-  model.api.root({
-    text: '',
-    slices: [],
-  });
-  model.api.str(['text']).ins(0, 'wworld');
-  model.api.str(['text']).ins(0, 'helo ');
-  model.api.str(['text']).ins(2, 'l');
-  model.api.str(['text']).del(7, 1);
-  model.api.str(['text']).ins(11, ' this game is awesome');
-  const peritext = new Peritext(model, model.api.str(['text']).node, model.api.arr(['slices']).node);
-  const slices = peritext.slices;
-  const encodeAndDecode = () => {
-    const buf = model.toBinary();
-    const model2 = Model.fromBinary(buf);
-    const peritext2 = new Peritext(model2, model2.api.str(['text']).node, model2.api.arr(['slices']).node);
-    return {model2, peritext2};
-  };
-  return {model, peritext, slices, encodeAndDecode};
-};
+import {setup} from './setup';
 
 test('initially slice list is empty', () => {
   const {peritext} = setup();
diff --git a/src/json-crdt-extensions/peritext/slice/__tests__/setup.ts b/src/json-crdt-extensions/peritext/slice/__tests__/setup.ts
new file mode 100644
index 0000000000..f31bb4c04b
--- /dev/null
+++ b/src/json-crdt-extensions/peritext/slice/__tests__/setup.ts
@@ -0,0 +1,24 @@
+import {Model} from '../../../../json-crdt/model';
+import {Peritext} from '../../Peritext';
+
+export const setup = () => {
+  const model = Model.withLogicalClock(12345678);
+  model.api.root({
+    text: '',
+    slices: [],
+  });
+  model.api.str(['text']).ins(0, 'wworld');
+  model.api.str(['text']).ins(0, 'helo ');
+  model.api.str(['text']).ins(2, 'l');
+  model.api.str(['text']).del(7, 1);
+  model.api.str(['text']).ins(11, ' this game is awesome');
+  const peritext = new Peritext(model, model.api.str(['text']).node, model.api.arr(['slices']).node);
+  const slices = peritext.slices;
+  const encodeAndDecode = () => {
+    const buf = model.toBinary();
+    const model2 = Model.fromBinary(buf);
+    const peritext2 = new Peritext(model2, model2.api.str(['text']).node, model2.api.arr(['slices']).node);
+    return {model2, peritext2};
+  };
+  return {model, peritext, slices, encodeAndDecode};
+};