fix: add "address()" on mock Socket

src/interceptors/ClientRequest/MockHttpSocket.ts

@@ -124,6 +124,7 @@ export class MockHttpSocket extends MockSocket {
    */
   public passthrough(): void {
     const socket = this.createConnection()
+    this.address = socket.address.bind(socket)
 
     // Flush the buffered "socket.write()" calls onto
     // the original socket instance (i.e. write request body).
@@ -205,6 +206,13 @@ export class MockHttpSocket extends MockSocket {
       return
     }
 
+    // Return fake address information for the socket.
+    this.address = () => ({ 
+      address: '127.0.0.1',
+      family: 'IPv4',
+      port: 0,
+    })
+
     // First, emit all the connection events
     // to emulate a successful connection.
     this.mockConnect()
@@ -298,7 +306,7 @@ export class MockHttpSocket extends MockSocket {
   }
 
   private mockConnect(): void {
-    this.emit('lookup', null, '::1', 6, this.connectionOptions.host)
+    this.emit('lookup', null, '127.0.0.1', 4, this.connectionOptions.host)
     this.emit('connect')
     this.emit('ready')
 

test/modules/http/compliance/http.test.ts

@@ -163,3 +163,41 @@ it('mocks response to a non-existing host', async () => {
   expect(await text()).toBe('howdy, john')
   expect(requestListener).toHaveBeenCalledTimes(1)
 })
+
+it('returns mocked socket address', async () => {
+  interceptor.on('request', async ({ request }) => {
+    request.respondWith(new Response())
+  })
+
+  const connectPromise = new DeferredPromise<object>()
+  const request = http.get('http://example.com')
+  request.once('socket', socket => {
+    socket.once('connect', () => {
+      connectPromise.resolve(socket.address())
+    })
+  })
+
+  await expect(connectPromise).resolves.toEqual({
+    address: '127.0.0.1',
+    family: 'IPv4',
+    port: 0,
+  })
+});
+
+
+it('returns real socket address', async () => {
+  const connectPromise = new DeferredPromise<object>()
+  const request = http.get(httpServer.http.url('/user'))
+  request.once('socket', socket => {
+    socket.once('connect', () => {
+      connectPromise.resolve(socket.address())
+    })
+  })
+
+  await waitForClientRequest(request);
+  await expect(connectPromise).resolves.toEqual({
+    address: '127.0.0.1',
+    family: 'IPv4',
+    port: expect.any(Number),
+  })
+});