mock: fix mocking of Uint8Array and ArrayBuffers as provided mock-rep…

…onses (#3662) (#3689)

(cherry picked from commit 2d524cf)

Co-authored-by: Aras Abbasi <aras.abbasi@googlemail.com>

lib/mock/mock-utils.js

@@ -118,6 +118,10 @@ function matchKey (mockDispatch, { path, method, body, headers }) {
 function getResponseData (data) {
   if (Buffer.isBuffer(data)) {
     return data
+  } else if (data instanceof Uint8Array) {
+    return data
+  } else if (data instanceof ArrayBuffer) {
+    return data
   } else if (typeof data === 'object') {
     return JSON.stringify(data)
   } else {

test/mock-interceptor.js

@@ -6,6 +6,7 @@ const { MockInterceptor, MockScope } = require('../lib/mock/mock-interceptor')
 const MockAgent = require('../lib/mock/mock-agent')
 const { kDispatchKey } = require('../lib/mock/mock-symbols')
 const { InvalidArgumentError } = require('../lib/core/errors')
+const { fetch } = require('../lib/web/fetch/index')
 
 describe('MockInterceptor - path', () => {
   test('should remove hash fragment from paths', t => {
@@ -257,3 +258,51 @@ describe('MockInterceptor - replyContentLength', () => {
     t.ok(result instanceof MockInterceptor)
   })
 })
+
+describe('MockInterceptor - different payloads', () => {
+  [
+    // Buffer
+    ['arrayBuffer', 'ArrayBuffer', 'ArrayBuffer', new TextEncoder().encode('{"test":true}').buffer, new TextEncoder().encode('{"test":true}').buffer],
+    ['json', 'ArrayBuffer', 'Object', new TextEncoder().encode('{"test":true}').buffer, { test: true }],
+    ['bytes', 'ArrayBuffer', 'Uint8Array', new TextEncoder().encode('{"test":true}').buffer, new TextEncoder().encode('{"test":true}')],
+    ['text', 'ArrayBuffer', 'string', new TextEncoder().encode('{"test":true}').buffer, '{"test":true}'],
+
+    // Buffer
+    ['arrayBuffer', 'Buffer', 'ArrayBuffer', Buffer.from('{"test":true}'), new TextEncoder().encode('{"test":true}').buffer],
+    ['json', 'Buffer', 'Object', Buffer.from('{"test":true}'), { test: true }],
+    ['bytes', 'Buffer', 'Uint8Array', Buffer.from('{"test":true}'), new TextEncoder().encode('{"test":true}')],
+    ['text', 'Buffer', 'string', Buffer.from('{"test":true}'), '{"test":true}'],
+
+    // Uint8Array
+    ['arrayBuffer', 'Uint8Array', 'ArrayBuffer', new TextEncoder().encode('{"test":true}'), new TextEncoder().encode('{"test":true}').buffer],
+    ['json', 'Uint8Array', 'Object', new TextEncoder().encode('{"test":true}'), { test: true }],
+    ['bytes', 'Uint8Array', 'Uint8Array', new TextEncoder().encode('{"test":true}'), new TextEncoder().encode('{"test":true}')],
+    ['text', 'Uint8Array', 'string', new TextEncoder().encode('{"test":true}'), '{"test":true}'],
+
+    // string
+    ['arrayBuffer', 'string', 'ArrayBuffer', '{"test":true}', new TextEncoder().encode('{"test":true}').buffer],
+    ['json', 'string', 'Object', '{"test":true}', { test: true }],
+    ['bytes', 'string', 'Uint8Array', '{"test":true}', new TextEncoder().encode('{"test":true}')],
+    ['text', 'string', 'string', '{"test":true}', '{"test":true}'],
+
+    // object
+    ['arrayBuffer', 'Object', 'ArrayBuffer', { test: true }, new TextEncoder().encode('{"test":true}').buffer],
+    ['json', 'Object', 'Object', { test: true }, { test: true }],
+    ['bytes', 'Object', 'Uint8Array', { test: true }, new TextEncoder().encode('{"test":true}')],
+    ['text', 'Object', 'string', { test: true }, '{"test":true}']
+  ].forEach(([method, inputType, outputType, input, output]) => {
+    test(`${inputType} will be returned as ${outputType} via ${method}()`, async (t) => {
+      t = tspl(t, { plan: 1 })
+
+      const mockAgent = new MockAgent()
+      mockAgent.disableNetConnect()
+      mockAgent
+        .get('https://localhost')
+        .intercept({ path: '/' }).reply(200, input)
+
+      const response = await fetch('https://localhost', { dispatcher: mockAgent })
+
+      t.deepStrictEqual(await response[method](), output)
+    })
+  })
+})

test/mock-utils.js

@@ -162,6 +162,18 @@ describe('getResponseData', () => {
     const responseData = getResponseData(Buffer.from('test'))
     t.ok(Buffer.isBuffer(responseData))
   })
+
+  test('it should return Uint8Array untouched', (t) => {
+    t = tspl(t, { plan: 1 })
+    const responseData = getResponseData(new TextEncoder().encode('{"test":true}'))
+    t.ok(responseData instanceof Uint8Array)
+  })
+
+  test('it should return ArrayBuffers untouched', (t) => {
+    t = tspl(t, { plan: 1 })
+    const responseData = getResponseData(new TextEncoder().encode('{"test":true}').buffer)
+    t.ok(responseData instanceof ArrayBuffer)
+  })
 })
 
 test('getStatusText', (t) => {