kotlin-tauri-apps-api/tauri.apps.api/mockIPC

mockIPC

external fun mockIPC(cb: (cmd: String, InvokeArgs?) -> Any?, options: MockIPCOptions = definedExternally)(source)

Intercepts all IPC requests with the given mock handler.

This function can be used when testing tauri frontend applications or when running the frontend in a Node.js context during static site generation.

Examples

Testing setup using Vitest:

import { mockIPC, clearMocks } from "@tauri-apps/api/mocks"
import { invoke } from "@tauri-apps/api/core"

afterEach(() => {
   clearMocks()
})

test("mocked command", () => {
 mockIPC((cmd, payload) => {
  switch (cmd) {
    case "add":
      return (payload.a as number) + (payload.b as number);
    default:
      break;
    }
 });

 expect(invoke('add', { a: 12, b: 15 })).resolves.toBe(27);
})

The callback function can also return a Promise:

import { mockIPC, clearMocks } from "@tauri-apps/api/mocks"
import { invoke } from "@tauri-apps/api/core"

afterEach(() => {
   clearMocks()
})

test("mocked command", () => {
 mockIPC((cmd, payload) => {
  if(cmd === "get_data") {
   return fetch("https://example.com/data.json")
     .then((response) => response.json())
  }
 });

 expect(invoke('get_data')).resolves.toBe({ foo: 'bar' });
})

listen can also be mocked with direct calls to the emit function. This functionality is opt-in via the shouldMockEvents option:

import { mockIPC, clearMocks } from "@tauri-apps/api/mocks"
import { emit, listen } from "@tauri-apps/api/event"

afterEach(() => {
   clearMocks()
})

test("mocked event", () => {
 mockIPC(() => {}, { shouldMockEvents: true }); // enable event mocking

 const eventHandler = vi.fn();
 listen('test-event', eventHandler); // typically in component setup or similar

 emit('test-event', { foo: 'bar' });
 expect(eventHandler).toHaveBeenCalledWith({
   event: 'test-event',
   payload: { foo: 'bar' }
 });
})

emitTo is currently not supported by this mock implementation.

Since

1.0.0