add server disconnect function

lib/controller.js

@@ -36,6 +36,15 @@ const create = (runner, modules, config) => {
                                              room,
                                              config.client);
       return controller.registry[room];
+    },
+
+    forceDisconnect: room => {
+      controller.registry[room].execute(() => {
+        /* eslint-disable no-undef */
+        robot.stop();
+        /* eslint-enable */
+      }).end();
+      delete controller.registry[room];
     }
   };
   return controller;

lib/controller.test.js

@@ -24,8 +24,19 @@ const {create} = require('./controller.js');
 
 // Here are some needed mocks
 
+const functionRunnerMock = {
+  execute() {
+    return {
+      end() {
+      }
+    };
+  }
+};
+
 const runnerMock = {
-  run: () => {}
+  run: () => {
+    return functionRunnerMock;
+  }
 };
 
 const configMock = {
@@ -60,4 +71,17 @@ describe('controller', () => {
     controller.client('test');
     expect(controller.registry).toHaveProperty('test', client1);
   });
+
+  test('should not have any room in registry when the client is disconnect', () => {
+    controller.client('test');
+    controller.forceDisconnect('test');
+    expect(controller.registry).toEqual({});
+  });
+
+  test('should have a room in registry when one client disconnect', () => {
+    controller.client('test1');
+    const client2 = controller.client('test2');
+    controller.forceDisconnect('test1');
+    expect(controller.registry).toHaveProperty('test2', client2);
+  });
 });