test: migrate file-validation util tests to TypeScript (#1578)

tests/unit/backend/utils/file-validation.spec.ts

@@ -0,0 +1,108 @@
+import fs from 'fs'
+
+import { FilePlatforms } from 'src/shared/constants'
+import {
+  getFileExtension,
+  getInvalidFileExtensionsInZip,
+  isInvalidFileExtension,
+} from 'src/shared/util/file-validation'
+
+describe('File validation utils', () => {
+  describe('getFileExtension', () => {
+    it('should handle file name with extension', () => {
+      const actual = getFileExtension('image.jpg')
+      expect(actual).toEqual('.jpg')
+    })
+
+    it('should handle file name with no extension', async () => {
+      const actual = getFileExtension('image-no-extension')
+      expect(actual).toEqual('')
+    })
+
+    it('should handle file name with multiple periods', async () => {
+      const actual = getFileExtension('file.a.txt')
+      expect(actual).toEqual('.txt')
+    })
+
+    it('should handle file name with consecutive periodsa', async () => {
+      const actual = getFileExtension('file....a.zip')
+      expect(actual).toEqual('.zip')
+    })
+  })
+
+  describe('isInvalidFileExtension', () => {
+    it('should return false when given valid extension', () => {
+      const actual = isInvalidFileExtension('.jpg')
+      expect(actual).toEqual(false)
+    })
+
+    it('should return true when given invalid extension', () => {
+      const actual = isInvalidFileExtension('.invalid')
+      expect(actual).toEqual(true)
+    })
+
+    it('should return false when given valid extension that is mixed case', () => {
+      const actual = isInvalidFileExtension('.jPG')
+      expect(actual).toEqual(false)
+    })
+
+    it('should return true when given invalid extension that is mixed case', () => {
+      const actual = isInvalidFileExtension('.sPoNgEbOb')
+      expect(actual).toEqual(true)
+    })
+  })
+
+  describe('getInvalidFileExtensionsInZip on server', () => {
+    it('should return empty array when there is only valid files', async () => {
+      const fn = getInvalidFileExtensionsInZip(FilePlatforms.Server)
+      const file = fs.readFileSync(
+        './tests/unit/backend/resources/onlyvalid.zip',
+      )
+      const actual = await fn(file)
+      expect(actual).toEqual([])
+    })
+
+    it('should return invalid extensions when zipped files are all invalid file extensions', async () => {
+      const fn = getInvalidFileExtensionsInZip(FilePlatforms.Server)
+      const file = fs.readFileSync(
+        './tests/unit/backend/resources/onlyinvalid.zip',
+      )
+      const actual = await fn(file)
+      expect(actual).toEqual(['.a', '.abc', '.py'])
+    })
+
+    it('should return only invalid extensions when zip has some valid file extensions', async () => {
+      const fn = getInvalidFileExtensionsInZip(FilePlatforms.Server)
+      const file = fs.readFileSync(
+        './tests/unit/backend/resources/invalidandvalid.zip',
+      )
+      const actual = await fn(file)
+      expect(actual).toEqual(['.a', '.oo'])
+    })
+
+    it('should exclude repeated invalid extensions', async () => {
+      const fn = getInvalidFileExtensionsInZip(FilePlatforms.Server)
+      const file = fs.readFileSync(
+        './tests/unit/backend/resources/repeated.zip',
+      )
+      const actual = await fn(file)
+      expect(actual).toEqual(['.a'])
+    })
+
+    it('should exclude folders', async () => {
+      const fn = getInvalidFileExtensionsInZip(FilePlatforms.Server)
+      const file = fs.readFileSync('./tests/unit/backend/resources/folder.zip')
+      const actual = await fn(file)
+      expect(actual).toEqual([])
+    })
+
+    it('should include invalid extensions in nested zip files', async () => {
+      const fn = getInvalidFileExtensionsInZip(FilePlatforms.Server)
+      const file = fs.readFileSync(
+        './tests/unit/backend/resources/nestedInvalid.zip',
+      )
+      const actual = await fn(file)
+      expect(actual).toEqual(['.a', '.oo'])
+    })
+  })
+})