add unit test for elimination logic

test/unit/specs/components/timeline.spec.js

@@ -0,0 +1,17 @@
+import { getExcludedStatusIdsByPinning } from 'src/components/timeline/timeline.js'
+import { difference } from 'lodash'
+
+describe('Timeline', () => {
+  describe('getExcludedStatusIdsByPinning', () => {
+    it('should not return unpinned status ids', () => {
+      const statuses = [
+        { id: 1 },
+        { id: 2 },
+        { id: 3 },
+        { id: 4 }
+      ]
+      const pinnedStatusIds = [1, 3]
+      expect(difference(getExcludedStatusIdsByPinning(statuses, pinnedStatusIds), pinnedStatusIds)).to.eql([])
+    })
+  })
+})