snapshot of https://github.com/yjs/yjs.git @ 96c96e1fcb1ef6ce866d5264b3f97f7f77b11f64 (2026-09-15)

tests/encoding.tests.js

@@ -0,0 +1,75 @@
+import * as t from 'lib0/testing'
+
+import {
+  contentRefs,
+  readContentDeleted,
+  readContentBinary,
+  readContentString,
+  readContentJSON,
+  readContentEmbed,
+  readContentType,
+  readContentFormat,
+  readContentAny,
+  readContentDoc
+} from '../src/ynode.js'
+
+import * as Y from '../src/index.js'
+
+/**
+ * @param {t.TestCase} _tc
+ */
+export const testStructReferences = _tc => {
+  t.assert(contentRefs.length === 11)
+  t.assert(contentRefs[1] === readContentDeleted)
+  t.assert(contentRefs[2] === readContentJSON) // TODO: deprecate content json?
+  t.assert(contentRefs[3] === readContentBinary)
+  t.assert(contentRefs[4] === readContentString)
+  t.assert(contentRefs[5] === readContentEmbed)
+  t.assert(contentRefs[6] === readContentFormat)
+  t.assert(contentRefs[7] === readContentType)
+  t.assert(contentRefs[8] === readContentAny)
+  t.assert(contentRefs[9] === readContentDoc)
+  // contentRefs[10] is reserved for Skip structs
+}
+
+/**
+ * Reported here: https://github.com/yjs/yjs/issues/308
+ * @param {t.TestCase} _tc
+ */
+export const testDiffStateVectorOfUpdateIsEmpty = _tc => {
+  const ydoc = new Y.Doc()
+  /**
+   * @type {any}
+   */
+  let sv = null
+  ydoc.get().insert(0, 'a')
+  ydoc.on('update', update => {
+    sv = Y.encodeStateVectorFromUpdate(update)
+  })
+  // should produce an update with an empty state vector (because previous ops are missing)
+  ydoc.get().insert(0, 'a')
+  t.assert(sv !== null && sv.byteLength === 1 && sv[0] === 0)
+}
+
+/**
+ * Reported here: https://github.com/yjs/yjs/issues/308
+ * @param {t.TestCase} _tc
+ */
+export const testDiffStateVectorOfUpdateIgnoresSkips = _tc => {
+  const ydoc = new Y.Doc()
+  /**
+   * @type {Array<Uint8Array<ArrayBuffer>>}
+   */
+  const updates = []
+  ydoc.on('update', update => {
+    updates.push(update)
+  })
+  ydoc.get().insert(0, 'a')
+  ydoc.get().insert(0, 'b')
+  ydoc.get().insert(0, 'c')
+  const update13 = Y.mergeUpdates([updates[0], updates[2]])
+  const sv = Y.encodeStateVectorFromUpdate(update13)
+  const state = Y.decodeStateVector(sv)
+  t.assert(state.get(ydoc.clientID) === 1)
+  t.assert(state.size === 1)
+}