add a few tests for req.range

Author: v1rtl

tests/modules/req.test.ts

@@ -1,16 +1,16 @@
-// import { expect } from 'https://deno.land/x/expect@v0.2.6/mod.ts'
+import { expect } from 'https://deno.land/x/expect@v0.2.6/mod.ts'
 import { describe, it, InitAppAndTest } from '../util.ts'
 
 import {
   checkIfXMLHttpRequest,
   getAccepts,
   getAcceptsEncodings,
   getFreshOrStale,
-  getRequestHeader
-  /*  getRangeFromHeader,
-  reqIs */
+  getRequestHeader,
+  getRangeFromHeader,
+  reqIs
 } from '../../extensions/req/mod.ts'
-// import { Ranges } from '../../types.ts'
+import { Ranges } from '../../types.ts'
 
 describe('Request extensions', () => {
   describe('req.get(header)', () => {
@@ -104,4 +104,37 @@ describe('Request extensions', () => {
       await fetch.get('/').expect('stale')
     })
   })
+  describe('req.range', () => {
+    it('should return parsed ranges', async () => {
+      const { fetch } = InitAppAndTest((req, res) => {
+        const range = getRangeFromHeader(req)
+        const array = range(300)
+        expect(array).toContain({ end: 299, start: 0 })
+        expect(array).toHaveLength(1)
+        res.end()
+      })
+
+      await fetch.get('/').set('Range', 'bytes=0-1000')
+    })
+    it('should cap to the given size', async () => {
+      const { fetch } = InitAppAndTest((req, res) => {
+        const range = getRangeFromHeader(req)
+        const size = 300
+        expect((range(size) as Ranges)?.[0].end).toBe(size - 1)
+        res.end()
+      })
+
+      await fetch.get('/').set('Range', 'bytes=0-1000')
+    })
+    it('should cap to the given size when open-ended', async () => {
+      const { fetch } = InitAppAndTest((req, res) => {
+        const range = getRangeFromHeader(req)
+        const size = 300
+        expect((range(size) as Ranges)?.[0].end).toBe(size - 1)
+        res.end()
+      })
+
+      await fetch.get('/').set('Range', 'bytes=0-')
+    })
+  })
 })