Feed filter implementation

vue/src/composables/__tests__/useFeeds.spec.js

@@ -13,7 +13,7 @@ class FakeIntersectionObserver {
 vi.stubGlobal('IntersectionObserver', FakeIntersectionObserver)
 
 describe('useFeeds', () => {
-  const { feeds, showMessage, message, showModal, fetchData, sync, getReadable, setInitialLoad, handleIntersection } = useFeeds()
+  const { feeds, allItems, feedFilter, feedTitles, unreadCount, setFeedFilter, showMessage, message, showModal, fetchData, sync, getReadable, setInitialLoad, handleIntersection, markAllRead } = useFeeds()
 
   beforeEach(() => {
     localStorage.setItem('user-token', 'test-token')
@@ -21,6 +21,8 @@ describe('useFeeds', () => {
     vi.clearAllMocks()
 
     feeds.value = []
+    allItems.value = []
+    feedFilter.value = null
     showMessage.value = false
     message.value = ''
     showModal.value = false
@@ -117,6 +119,108 @@ describe('useFeeds', () => {
     setInitialLoad(false)
   })
 
+  describe('feed filter', () => {
+    const twoFeedsResponse = {
+      data: {
+        feeds: [
+          {
+            title: 'Feed A',
+            items: [
+              { id: 1, title: 'A1', content: '', url: 'https://example.test/a1', timestamp: '2026-01-01 10:00:00' },
+              { id: 3, title: 'A2', content: '', url: 'https://example.test/a2', timestamp: '2026-01-03 10:00:00' },
+            ],
+          },
+          {
+            title: 'Feed B',
+            items: [
+              { id: 2, title: 'B1', content: '', url: 'https://example.test/b1', timestamp: '2026-01-02 10:00:00' },
+            ],
+          },
+        ],
+      },
+    }
+
+    it('narrows the displayed list to a single feed and restores it on "All feeds"', async () => {
+      axios.get.mockResolvedValueOnce(twoFeedsResponse)
+      await fetchData()
+
+      // Options are the distinct feed titles, sorted.
+      expect(feedTitles.value).toEqual(['Feed A', 'Feed B'])
+      // Unfiltered: everything, newest first (Jan 3, Jan 2, Jan 1).
+      expect(feeds.value.map(f => f.id)).toEqual([3, 2, 1])
+
+      await setFeedFilter('Feed A')
+      expect(feeds.value.map(f => f.id)).toEqual([3, 1])
+
+      await setFeedFilter(null)
+      expect(feeds.value.map(f => f.id)).toEqual([3, 2, 1])
+    })
+
+    it('does not resurrect read articles when the filter is cleared', async () => {
+      axios.get.mockResolvedValueOnce(twoFeedsResponse)
+      axios.put.mockResolvedValue({ status: 200 })
+      await fetchData()
+
+      await setFeedFilter('Feed A')
+      setInitialLoad(true)
+
+      // The first Feed A article scrolls above the viewport → marked read and
+      // dropped from both the filtered list and the master.
+      await handleIntersection([
+        { isIntersecting: false, boundingClientRect: { y: -10 }, target: { id: '0' } },
+      ])
+      setInitialLoad(false)
+
+      expect(feeds.value.map(f => f.id)).toEqual([1])
+
+      await setFeedFilter(null)
+      // Article 3 stays gone; the still-unread articles remain, newest first.
+      expect(feeds.value.map(f => f.id)).toEqual([2, 1])
+    })
+
+    it('keeps an emptied filtered feed selected and selectable, showing "All caught up"', async () => {
+      axios.get.mockResolvedValueOnce(twoFeedsResponse)
+      axios.put.mockResolvedValue({ status: 200 })
+      await fetchData()
+
+      await setFeedFilter('Feed B')
+      expect(feeds.value.map(f => f.id)).toEqual([2])
+
+      // Mark all (visible = just Feed B) read — Feed B has no unread items left.
+      vi.spyOn(window, 'confirm').mockReturnValue(true)
+      await markAllRead()
+
+      // The list empties, but the filter stays put and the feed remains a
+      // selectable option (so the <select> never dangles) even though it no
+      // longer has unread items.
+      expect(feeds.value).toEqual([])
+      expect(feedFilter.value).toBe('Feed B')
+      expect(feedTitles.value).toEqual(['Feed A', 'Feed B'])
+
+      // Switching away drops the now-empty feed from the options.
+      await setFeedFilter(null)
+      expect(feedTitles.value).toEqual(['Feed A'])
+      expect(feeds.value.map(f => f.id)).toEqual([3, 1])
+    })
+
+    it('counts unread items in the selected feed when a filter is active, else the global total', async () => {
+      axios.get.mockResolvedValueOnce(twoFeedsResponse)
+      await fetchData()
+
+      // No filter: global unread total across both feeds.
+      expect(unreadCount.value).toBe(3)
+
+      // Filtered: only the selected feed's unread items.
+      await setFeedFilter('Feed B')
+      expect(unreadCount.value).toBe(1)
+      await setFeedFilter('Feed A')
+      expect(unreadCount.value).toBe(2)
+
+      await setFeedFilter(null)
+      expect(unreadCount.value).toBe(3)
+    })
+  })
+
   it('strips leftover embedded-video placeholder headings', async () => {
     feeds.value = [{
       id: 1,