修复主题恢复与勋章状态

tests/badge-state.test.js

@@ -0,0 +1,27 @@
+const test = require('node:test')
+const assert = require('node:assert/strict')
+
+const { getBadgeProgress, getBadgeCelebration } = require('../utils/badge-state')
+
+const badges = [{ days: 3 }, { days: 7 }, { days: 14 }]
+
+test('badge progress remains zero before the first milestone', () => {
+  assert.equal(getBadgeProgress(badges, 1), 0)
+  assert.equal(getBadgeProgress(badges, 2), 0)
+  assert.equal(getBadgeProgress(badges, 3), 4)
+})
+
+test('badge celebration keeps prior milestones seen after records are deleted', () => {
+  const afterDeletion = getBadgeCelebration([3], [])
+  assert.deepEqual(afterDeletion, { newly: [], seen: [3] })
+
+  const afterRetraining = getBadgeCelebration(afterDeletion.seen, [3])
+  assert.deepEqual(afterRetraining, { newly: [], seen: [3] })
+})
+
+test('badge celebration only reports milestones never seen before', () => {
+  assert.deepEqual(getBadgeCelebration([3], [3, 7]), {
+    newly: [7],
+    seen: [3, 7]
+  })
+})