MockHTTPServer class Null safety

This class is used as a 'mock' implementation of another HTTP server.

Create instances of these types during testing to simulate responses for HTTP requests your application makes to another server. All requests your application makes to another server will be sent to this object. Your tests can then verify the correct request was sent and your application's behavior can be validated against the possible responses from the other server.

An instance of this type listens on 'localhost' on port. Your application should use configuration values to provide the base URL and port of another server. During testing, your application should use the base URL 'http://localhost:' and instantiate an mock HTTP server with that port.

By default, an instance of this type returns a 503 error response, indicating that the service can't be reached. Different responses can be returned via defaultResponse, queueResponse, queueHandler, and queueOutage.

Example usages: test("POST /nest/pair associates account with Nest service", () async { var nestMockServer = MockHTTPServer(7777); await nestMockServer.open();

      // Expect that POST /nest/pair sends an HTTP request to Nest server.
      var response = await client.request("/nest/pair", ...).post();
      expect(response, ...);

      // Verify the path of the HTTP request sent to Nest server.
      var requestSentToNest = await nestMockServer.next();
      expect(requestSentToNest.path.segments[1, response["id"]);

      await nestMockServer.close();
    });