implemented frontend including separate message system; started to implement backend

yjs-poll/node_modules/y-protocols/awareness.test.js

@@ -0,0 +1,53 @@
+
+import * as Y from 'yjs'
+import * as t from 'lib0/testing'
+import * as awareness from './awareness'
+
+/**
+ * @param {t.TestCase} tc
+ */
+export const testAwareness = tc => {
+  const doc1 = new Y.Doc()
+  doc1.clientID = 0
+  const doc2 = new Y.Doc()
+  doc2.clientID = 1
+  const aw1 = new awareness.Awareness(doc1)
+  const aw2 = new awareness.Awareness(doc2)
+  aw1.on('update', /** @param {any} p */ ({ added, updated, removed }) => {
+    const enc = awareness.encodeAwarenessUpdate(aw1, added.concat(updated).concat(removed))
+    awareness.applyAwarenessUpdate(aw2, enc, 'custom')
+  })
+  let lastChangeLocal = /** @type {any} */ (null)
+  aw1.on('change', /** @param {any} change */ change => {
+    lastChangeLocal = change
+  })
+  let lastChange = /** @type {any} */ (null)
+  aw2.on('change', /** @param {any} change */ change => {
+    lastChange = change
+  })
+  aw1.setLocalState({ x: 3 })
+  t.compare(aw2.getStates().get(0), { x: 3 })
+  t.assert(/** @type {any} */ (aw2.meta.get(0)).clock === 1)
+  t.compare(lastChange.added, [0])
+  // When creating an Awareness instance, the the local client is already marked as available, so it is not updated.
+  t.compare(lastChangeLocal, { added: [], updated: [0], removed: [] })
+
+  // update state
+  lastChange = null
+  lastChangeLocal = null
+  aw1.setLocalState({ x: 4 })
+  t.compare(aw2.getStates().get(0), { x: 4 })
+  t.compare(lastChangeLocal, { added: [], updated: [0], removed: [] })
+  t.compare(lastChangeLocal, lastChange)
+
+  lastChange = null
+  lastChangeLocal = null
+  aw1.setLocalState({ x: 4 })
+  t.assert(lastChange === null)
+  t.assert(/** @type {any} */ (aw2.meta.get(0)).clock === 3)
+  t.compare(lastChangeLocal, lastChange)
+  aw1.setLocalState(null)
+  t.assert(lastChange.removed.length === 1)
+  t.compare(aw1.getStates().get(0), undefined)
+  t.compare(lastChangeLocal, lastChange)
+}