[Frontend][UnitTests] Migrate frontend unit tests to vitest

services/frontend/package.json

@@ -7,7 +7,7 @@
     "build": "tsc --noEmit && NODE_OPTIONS=\"--max-old-space-size=4096\" vite build",
     "preview": "vite preview",
     "tsc": "tsc",
-    "test:unit": "node --import tsx --test './tests/unit/**/*test.ts' --test-reporter spec --test-force-exit",
+    "test:unit": "vitest ./tests/unit",
     "test:component": "playwright test -c playwright-ct.config.ts"
   },
   "dependencies": {
@@ -48,8 +48,8 @@
     "@types/react-dom": "^18.3.7",
     "@vitejs/plugin-react": "^6.0.3",
     "babel-plugin-react-compiler": "1.0.0",
-    "tsx": "4.22.4",
     "typescript": "^7.0.2",
-    "vite": "^8.1.4"
+    "vite": "^8.1.4",
+    "vitest": "4.1.9"
   }
 }

services/frontend/tests/unit/creditsProduced.test.ts

@@ -1,5 +1,4 @@
-import assert from 'node:assert/strict'
+import { describe, it, assert } from 'vitest'
-import { describe, it } from 'node:test'
 
 import { makeTableStats } from '@/util/creditsProduced'
 

services/frontend/tests/unit/criteriaProgress.test.ts

@@ -1,11 +1,9 @@
-import assert from 'node:assert/strict'
-import { describe, it } from 'node:test'
-
 import { getProgressCriteria } from '@/redux/populations/criteriaProgress'
 import { CreditTypeCode, ProgressCriteria } from '@oodikone/shared/types'
 import { StudentStudyPlan } from '@oodikone/shared/types/studentData'
 
 import { PopulationCourseStatsCredit } from '@/redux/populations/util'
+import { describe, it, assert } from 'vitest'
 
 const createCriteria = (overrides: Partial<ProgressCriteria> = {}): ProgressCriteria => ({
   allCourseGroups: {

services/frontend/vitest.config.ts

@@ -0,0 +1,20 @@
+import path from 'path'
+import { defineConfig } from 'vitest/config'
+
+// oxlint-disable-next-line no-default-export
+export default defineConfig({
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
+  test: {
+    reporters: ['tree'],
+    exclude: ['./dist', 'node_modules'],
+    pool: 'threads',
+    testTimeout: 10_000, // 10s timeout
+    sequence: {
+      concurrent: true, // Enable parallel tests by default
+    },
+  },
+})