fix(docs): Add mock server examples

README.md

@@ -10,7 +10,7 @@ npm install @relaycorp/ws-mock
 
 ## Using the mock client
 
-You should initialise `MockClient` by passing the WebSocket server to be tested and then call `client.connect()` to initiate the connection. From that point you can interact with the server. For example:
+You should initialise `MockClient` by passing the `ws` server to be tested and then call `client.connect()` to initiate the connection. From that point you can interact with the server. For example:
 
 ```javascript
   test('Challenge should be sent as soon as client connects', async () => {
@@ -23,3 +23,23 @@ You should initialise `MockClient` by passing the WebSocket server to be tested
 ```
 
 You'll find [real-world examples in relaycorp/relaynet-internet-gateway](https://github.com/relaycorp/relaynet-internet-gateway/search?l=TypeScript&q=%22%40relaycorp%2Fws-mock%22).
+
+## Using the mock server
+
+Simply initialise `MockServer` with the `ws` client connection you wish to test. For example:
+
+```javascript
+  test('Server message should be played back', async () => {
+    const mockConnection = new MockConnection();
+    const mockServer = new MockServer(mockConnection);
+    const clientUnderTest = new ClientUnderTest(mockConnection);
+
+    clientUnderTest.connectToServer();
+    mockServer.send('foo');
+
+    const clientResponse = await mockServer.receive();
+    expect(clientResponse).toEqual('foo');
+  });
+```
+
+You'll find [real-world examples in relaycorp/relaynet-poweb-js](https://github.com/relaycorp/relaynet-poweb-js/search?l=TypeScript&q=%22%40relaycorp%2Fws-mock%22).