[UnitTests] Add startYearAtUniFilter tests

services/frontend/tests/unit/filters/startYearAtUni.test.ts

@@ -0,0 +1,34 @@
+import { assert, describe, it } from 'vitest'
+
+import { startYearAtUniFilter } from '@/components/FilterView/filters/startYearAtUni'
+import { FormattedStudent } from '@oodikone/shared/types/studentData'
+
+import { createStudent } from './helpers'
+
+const filterStudent = (student: FormattedStudent, selected: number | string) =>
+  startYearAtUniFilter().filter(student, { args: undefined, options: { selected }, precomputed: undefined })
+
+void describe('startYearAtUniFilter', () => {
+  void it("should return true when selected year matches the student's starting year (FALL)", () => {
+    const student = createStudent({ started: new Date('2020-08-01') })
+
+    assert.strictEqual(filterStudent(student, 2020), true)
+  })
+
+  void it("should return true when selected year matches the student's starting year (SPRING)", () => {
+    const student = createStudent({ started: new Date('2020-03-01') })
+
+    assert.strictEqual(filterStudent(student, 2020), true)
+  })
+
+  void it("should return false when selected year doesn't match the student's starting year", () => {
+    const student = createStudent({ started: new Date('2020-08-01') })
+
+    assert.strictEqual(filterStudent(student, 2021), false)
+  })
+
+  void it('isActive should match the filter state', () => {
+    assert.strictEqual(startYearAtUniFilter().isActive({ selected: '' }, undefined), false)
+    assert.strictEqual(startYearAtUniFilter().isActive({ selected: 2020 }, undefined), true)
+  })
+})