Move FlipperServer initialisation out of flipper-core

Summary: This diff makes sure flipper-ui-core no longer depends on flipper-server-core. Currently server config is still transferred from UI to server, which doesn't really make sense in future scenarios where server might start before client, but will address that separately

Reviewed By: timur-valiev, aigoncharov

Differential Revision: D32462835

fbshipit-source-id: 498a944256ba1aabbf963b896953e64d11e27214

desktop/flipper-plugin/src/test-utils/test-utils.tsx

@@ -40,7 +40,11 @@ import {stubLogger} from '../utils/Logger';
 import {Idler} from '../utils/Idler';
 import {createState} from '../state/atom';
 import baseMockConsole from 'jest-mock-console';
-import {DeviceLogEntry} from 'flipper-common';
+import {
+  DeviceLogEntry,
+  FlipperServer,
+  FlipperServerCommands,
+} from 'flipper-common';
 
 type Renderer = RenderResult<typeof queries>;
 
@@ -581,3 +585,26 @@ export function mockConsole() {
 }
 
 export type MockedConsole = ReturnType<typeof mockConsole>;
+
+export function createFlipperServerMock(
+  overrides?: Partial<FlipperServerCommands>,
+): FlipperServer {
+  return {
+    async start() {},
+    on: jest.fn(),
+    off: jest.fn(),
+    exec: jest
+      .fn()
+      .mockImplementation(
+        (cmd: keyof FlipperServerCommands, ...args: any[]) => {
+          if (overrides?.[cmd]) {
+            return (overrides[cmd] as any)(...args);
+          }
+          return Promise.reject(
+            new Error(`FlipperServerMock exec not implemented: ${cmd}}`),
+          );
+        },
+      ),
+    close: jest.fn(),
+  };
+}